My Mercedes Benz
Welcome to my Mercedes S500 Coupe auto page. The info here will assist you in troubleshooting the electrical
- 14 Yrs of Smog Test Results: 2000 to 2014 -
The 2014 California smog test for my Mercedes S500 was completed recently. I've kept the previous test results so I decided to see
what, if any, the results might show. The table below summarizes the 2000 to 2014 smog tests run every two (2) years.
Similar to my Mercedes, I've kept the Smog Test results for my '90 Honda Accord LX. Since the car is 24 years old and had original smog accessories, those were replaced two (2) years ago prior to the 2012 smog tests. As you can see, the 2010 results were very shakey. In 2012, a "pre-test" was done to see how bad it is and it was bad! Although it did pass, it was just under the NOx and HC limits.
Honda 1990 Accord LX
The Honda's smog accessories were in bad condition as most were original parts . . . with 148000 miles in 2012! The PCV long since ceased to perform and was now a "bi-lateral" valve. The air-filter was plugged solid and finally, the EGR valve was badly carboned. In addition, the O2 sensor was also original as was the catalytic converter. Note the readings were progressively getting worse with the years so in 2012, all major smog elements were replaced. After two (2) years, the results are still exceptional as shown in the chart. The Nox at 25MPH was only 9 ppm!
So the $500 investment (including labor) in 2012 to replace the 02 sensor, catalytic converter, PCV valve, air filter and spark plugs has shown to be a good investment. All in all, the CA smog Test results show it to be as good as a new Honda!
Test Only Smog Stations
As you with older cars know, you MUST take it to a "test-only" smog center. Recommened to me was Kwon Auto Repair at 6690 Miramar Rd, telephone 858-587-9010. The state of California wants to remove older cars, so the smog "checkover" is very detailed. They have forbid car warmup period. So now they want the tech to start the car, idle it for 2 minutes and go into the smog test. If the car was parked and shut off (as is the norm), the cat will be cold meaning that it could fail smog testing. Best to keep the car idling to ensure that the cat is hot.
It should be obvious that they want to remove the older cars from operation so you should make sure that the car is thoroughly warmed and has been taken on the freeway to fully heat the catalytic converter. A word to the wise!
Starting in Jan 2013, all 2000 or newer cars have be tested using their ON-BOARD systems; no interconnection to the smog stations equipment. Today (2014), I found out that the new-cars (2011 and later) test ok but that early cars have problems passing b/c of "glitches" in the test system and CA state software.
If you want to translate your smog parameters into Air-Fuel-Ratio (AFR), then download the Lambda Calculator Pro program and see how well your vehicle is "tuned". Very simple and straightforward program to install and use. My S500 cpe's AFR is "1"; ie Lambda = 1 at both 15 and 25MPH. Can't be better than that!
Honda Lambda Calculation
To plot the results of the CA Smog tests for my Honda, simply enter the numbers from the summary sheet into the program and it will show how it's performing. After entering the numbers for "25MPH", you see that Lambda = 1.004 meaning that the Air/Fuel (A/F) ratio is 14.76 yielding fuel mixture at 0.4% Lean.
Auxiliary Fan Modification for All Mercedes
Get a cooler running Mercedes in 5 minutes! That's how easy it is to install either version of my
Cool Harness(c) into your Mercedes Benz. Simply unplug
the existing harness and install it into the CH(c) and your MB will
reward you with a cooler operating engine.
The Cool Harness-V2(c) fills the void for the late model Mercedes owner who wanted a Cool Harness. Now it's here after long last!
All of the comments for the original version Cool Harness apply to this version. The Cool Harness-V2 temperature cut-in point has been set to 94 deg C. So only ONE (1) version of the CH-V2 is needed.
The CH-V2 has two (2) separate sensors within the package. Mercedes changed to this combo sensor starting with '95 model year cars. It combines the original CTS (B10/8) and ECT (B11/2) sensors into one housing. In the CH-V2, the ECT sensor is 'stock'. Also the modification to the CTS portion does NOT affect the ECT portion. Each sensor operates independently.
Original Cool Harness: The price is $90 plus $5 s/h. S/H charges for USA orders only! Please contact for foreign order shipping.
Cool Harness-V2: The price is $90 plus $5 s/h. S/H charges for USA orders only! Please contact for foreign order shipping.
Both Cool Harness(c) models come with detailed installation instructions complete with detailed pictures of various MB engines showing the CTS location to assist you to complete the installation. If you can plug-in a toaster, you can install a Cool Harness(c) into your car.
For the original CH model, there are currently (2) models that you can select.
Personally, I use and recommend the CH-92 model.
* The remarks assume a hot day, 85F or above with 80% RH or higher with the A/C operating.
The higher the CH's cut-in temperature, the less the Aux fan(s) will operate. For example, with the
CH-95, the fan(s) will only operate if the engine temperature attains approximately 95C which
would most likely be during stop/go traffic. During freeway driving, the fan(s) may never operate. This assumes that your
car operates between 82-92C normally, which most Mercedes do.
Unsolicited comments from enthusiastic Cool Harness users:
Got the CH-92 in on Friday. I think it took me longer to find my keys than to hook it up. I ran the car ['95 S420] Saturday, what a difference!!! It got a bottle of purple ice last night too. Thank you for another great product!!! = MK =
Received [Brunei] 2 pieces Cool Harness-V2. Just install one in ['94] C280. It works like magic. The temperature stays around 90 deg C. Thank you. = PCF =
I'm impressed. Comes on at 92 [CH-92] and will keep it around 90 with AC in 90+ temps ['94 E500]. Without AC, it brings it down to below 82 where it runs in the winter. Kinda wish it turned off earlier. Am very pleased. Thanks. = WW =
Thanks for promptly shipping your cool harness [V2] for my '95 S500 Sedan. I showed this to my master Mercedes tech and he was quite impressed. I installed it ['96 SL500] within 5 minutes over the noon hour and already I can see a dramatic change in the temperature gauge. Thanks again for all of your help. = CG =
It works like a charm [CH-92]. In fact better than I thought. My next door neighbor stopped me as I was tooling down the street and I talked to her for 45 minutes while the car ['95 SL500] was running in 92 degree weather. Normally, it would have hit the top of the temp gauge, but this time it stayed at mid range. = AC =
Finally, solved temperature problem, it was Temp gauge. Today I replace the sensor with new one (only 14$). Difference between real coolant temp. and temp. gauge is about 5'c. My car is '95 S320. After replace the new temp. gauge sensor with your CH_V2, coolant temp. never exceed 95'c even in hot weather with air conditioner on. Before installing CH_V2 and new temp. gauge sensor, my car's coolant temp. is 100~110C, sometimes over 115C in hot weather. Aux fan's kick in temp. is just bellow the 95'c!!! Thank you so much for your great job and advice. Now, I am so happy that I don't have to worry about engine temp.!!!!!!! Best Regards = HBY =
I recently ordered the CH-92 and I just wanted to get back to you on it, and tell you that this Cool Harness is an outstanding buy! I installed it in less than two minutes and from the very next day the car runs extremely cooler. I use to read the temp gauge before at 100 degrees and above, but now it reads just at or above 80 degrees constantly. I recently drove my S-class ['94 S500 coupe] on a road trip from Tampa Bay to Orlando Florida and it was about 98 degrees outside. Living in Florida the daily outdoor temperature is always steamy HOT, but that very day my benz ran a cool 85 degrees the entire trip. Overall, this device works and definitely recommended period. Hats off to you. = PP =
I installed the Cool Harness [CH-92] right before I left for Vegas last Wednesday ['93 300TE], and it worked great! Went on to Parker Dam on Friday into 124 degree desert heat, uphill quite a lot, and the peace of mind I had in seeing my temp stay in the 100 degree range was priceless. I'm glad I found you. = MH =
Got the Cool Harness [CH-92] a few days after you sent it [Austria!], but hadnít the chance of testing ['92 300D] it until the last few days, which were warm enough to use air condition. Well, what should I say? It works perfectly! Thanks for the easy transaction and the great product. I will talk to my father - I think he will need one for his S-Class too. ;-) = CEL-H =
Got the Cool Harness [V2] today, it works great. I'm running at a cool 94 deg ['95 E320], and it was pretty hot today. Install took less than a minute! = MP =
Real nice little product [CH-92], I figured it would help some but didnít know really how great it is. The other day Iím driving from San Diego to Temecula in 95+ heat, with the A/C going and I noticed when I hit the stop and go traffic the temp gauge stayed well below its normal spot (above the 80 line) and didnít think much of it, so when I got to Temecula I stopped by the ATM machine in 100+ heat and left the car idling in the parking lot. Well the carís ['95 E300D] temp gauge didnít move and when I got out I heard those fans just whirling away and thought yeah, thatís a good little product Ė thanks! = TH =
I received the CH-92 a few weeks ago and installed same day and its working great. As you said, the temp does not go beyond 92C. I ran the car ['92 190E] on idle for over 5 mins and never went over 92C even with the A/C on. Great product and very well build. Thank you again and also you have a great web site on information. = NM =
I just wanted to let you that I received my CH-92 last Friday and installed it ['91 300E] the following day and it works great! The temperature gauge stays below 100 degrees at all times......even with A/C on! Thank you for a quality product and outstanding service. = AH =
I bought the cool harness CH-92 a few months ago and was discussing with you how it would work. It must have been related to outside ambient temperature (at the time it was 30). Ever since the warmer weather has arrived, It performs flawlessly, ['95 S600] just wanted to say thanks for a great product and a note on the temperature issue. = NR =
Just wanted to drop you a not to let you know that I received the harness CH-92 and it is working beautifully in my car. My engine bay ['94 E420] and I would like to thank you for a cooler running car. = AW =
I am one happy/cool Benz driver with your brilliant invention Ė I put it in [CH-92] and drove all day today with the coolest engine ever ['91 300TE]. Wish I knew about this several years ago as it is one of my pet peeves that MB makes the fan wait until the engine is toast before it kicks on Ė planned obsolescence? Thanks = DF =
I received the Cool Harness, [CH-92]. The directions were great. It took all of one minute from the time the hood was up till the time I shut it to install ['93 300SE]. I immediately took it out for a full A/C on hiway drive. Yep, it works, stayed below 98 degrees centigrade the entire time. No more creeping up over 100 degrees C anymore. Thanks for a great product. You ARE the MBZ man! = BS =
Just wanted to drop you an note to thank you for your device [CH-92]. It works great. Your installation instructions were accurate and it went right in. When sitting in traffic ['95 S500], the temp goes up to 90 and no higher. It used to make me nervous when the temp gauge would go up to the 100+ mark on the engine temp, now I don't have to worry about it. = SL =
Thanks...installed the CH-92 and it works great! Both fans whirling a steady blow through the radiator at the 92 degree mark ['94 E420]. = FA =
CH-92 works well. I was afraid of it running the fan most of the time. At least in 70F weather, the thermostat keeps the engine just slightly below the CH-92 [cut-in]. When I slow or stop with the AC on I get the fan SOMETIMES. This keeps the engine temp in a very narrow band which is especially good for the '91 300SL as it has the infamous combination of iron block and aluminum head. I'll pass along the good news to my buddies. = MK =
The "Cool Harness" [CH-92] is working GREAT, the car ['90 190E] never heats up beyond the set COOL HARNESS temperature, and I live in Las Vegas where the temperature is already hitting 100 degrees some days! = BV =
Wow, what a difference it makes, I live in Los Angeles and its been hot, I just drove in la traffic with AC on, up and down hills, I got it [CH-95] installed in my '94 E420 at Mr MB Motors on Reseda he was awesome. wow! thanks for that!!! = RU =
Just received my "Cool Harness", CH-92 in the mail. It is truly amazing. I installed in about 3 minutes with the engine ['92 400E] still hot. Instantly, my overall operating temperature is 20 degrees cooler. I tested it in the San Fernando Valley, where temperatures reach 105F and it worked perfectly. I even left the car idling, with my wife inside, AC on full for 10 minutes and the temperature did not come up. This product is truly incredible. Anyone with a MBZ should use one. = BT =
Just got the CH-92, installed it and that thing works great! My '92 400E runs much cooler wish I had know about it sooner. = GO =
Received the CH-95 today. Took 30 seconds to install ['92 300TE] and it works perfectly. The fans cut-in just shy of the 100C line on the temp gauge. That is exactly where I wanted it to cut in. Cooled the engine down to where it normally operates at (87C). This is a great idea. I think every one, especially in the South, should use one. It simply keeps the engine from fluctuating up into the high heat zone. Have a good day and I'm going to recommend this to my Mercedes mechanic. = DW =
I received CH-92 on Friday, installed it per the very detailed and organized instructions included with package. I drove the vehicle ['94 E420] several times this weekend and the temp stays at worst between the 80-100 marks. You have kept my vehicle running in top condition, I can't thank you enough. Great products, great marketing, great service. . . thanks again. = SS =
The cool harness, CH-92 is AWESOME! The temp ['94 S500] has not gone beyond 90C even once. Before this it used to linger between 100-110. THANKS SO MUCH!!! YOU ARE THE MAN!!! = AM =
I received the Cool Harness yesterday and installed it immediately ['94 E420]. What a difference it makes. Heat index today in Georgia was between 105 and 110. Drove approx 35 miles this afternoon and temperature ran around 85 on the hwy. Sitting at lights it may have gotten to 100 but dropped down quickly. Thanks again! = BT =
You can add me to your list of satisfied customers! I installed the CH-92 in my '92 500E in May and it has kept the car cooler, even in the summer heat of Dallas! If you even need a referral, let me know. I'll be glad to tell your prospective customers. = DH =
This CH-92 is great. It fit my '92 600SEL V12 just fine. On the V12s, the 'blue based' temperature sending unit is in the very front of the car, next to the power steering reservoir, under a plastic cover with MB emblem. About 10 min job, and most of that was getting the original connector off. So far it seems to keep temp right at the low to mid 90's 'C on the dash temp gauge. = BM =
I installed it right away and just came back from the test drive. Great product indeed, congratulations... It really took me only 3 minutes to install ['93 600SEL] it, including two to find out how to take off the plastic cover on the engine. It's the CH-98, and the fans cut in exactly at the 100C and shut off at 90C. That is exactly what I wanted!! Cheers from a satisfied customer. = MM=
Got the cool harness today, its awesome. Works like a charm, engine stays cool. Had a little trouble at first finding the CTS on my '92 500E but after installing, it was awesome! = PE =
The Cool Harness is absolutely awesome, it keeps the temp steady around 95 ['92 500E]. I always thought that the engine was like a CPU, keeping it cooler means it runs smoother. Very excited to see that it works as advertised. = GN =
I received the CH-92 and installed it today. Works great! The fans kicked on immediately because the car ['95 S500] was hot. = SF =
Super neat job on your design: the angled connector end and the shorter wire length is totally stealth. ['89 190E] = FD =
Got the part, the direction are very clear and the fan works very well ['94 C280]. Here in South Texas is way to hot for not using this option. It is a quality product you have built it looks very professional and unless anyone knows what to look for I doubt even the MB technician would spot it! Thanks again. = LH =
I installed the Cool Harness, CH-92 I got from you and my car ['89 190E] never saw 100C again! Very neat, looks like OEM and it works! = MA =
I just wanted to say thank you. I received the part [CH-92] today and installed ['88 300SE] it in less than a minute. Now I can drive with piece of mind despite all the traffic and warm days here in Atlanta. = RB =
I got a cool harness, CH-92 from you about a month ago and put it on my '94 C280 here in Tucson, AZ. I think it is a great part and I am sorry I didnít order it sooner. = MK =
The CH-95s both work as advertised. Combined with the lower coolant ratios using WaterWetter in my '89 300TE, I definitely see cooler engine temps. My 420SEL was already running well within the 85-95 range. Whatever the reason, the M103 engine tends to run hotter than my 420SEL. = EA =
To order one or more for your car, click here
to send an Email containing;
'Cool Harness' is copyright© 2000-2012 by K6JRF.
Mercedes-Benz Diagnostic Trouble Code Manual
I've received many requests for a document that summarizes the Mercedes-Benz Diagnostic Trouble Codes (MB_DTC). Well,
it's here! After collating a number of sources, the DTC document is ready to help you properly diagnose your car.
Diagnostic Trouble Code Manual is copyright© 2000-2010 by K6JRF.
Diagnostic Trouble Code Manual is copyright© 2000-2010 by K6JRF.
Diagnostic Trouble Code #19 Repair Eprom for V8 Mercedes-Benz
This is one of the Diagnostic Trouble Codes (DTC) that occurs in the Diag Module (Menu#6) which states:
Fuel injectors open/short or self-adaptation in LH-SFI control module (N3/1) at limit. This code lights the
Check Engine Lamp (CEL) because it directly affects engine emissions. It's not a 'nice' code as you will see!
DTC_19 Eprom is copyright© 2000-2010 by K6JRF.
DTC_19 Eprom is copyright© 2000-2010 by K6JRF.
Performance Chip for '92-'95 V8 Mercedes-Benz
PAD chip is warranted for 90 days for defects due to eprom failure.
No other warranty is expressed or implied.
Get horsepower in 20 minutes! That's how easy it is to install PAD's POWER+CHIP in your 1992-1995 Mercedes Benz V8.
Simply remove the Eprom chip using the step by step instruction sheet and install more hp and torque.
To boost horsepower output, the chip has been re-designed to increase the fuel injection and timing parameters
allowing for increased usable power through out the RPM range.
Looking for quality repairs at an reasonable price for your Mercedes-Benz?
Beside Ham Radio, I have another avocation, Mercedes
Benz automobiles. Here's my story to date.
|Model:||S 500 (140.070 chassis)|
|Mode of Operation:||4-stroke engine, gasoline injection|
|No of Cylinders:||8|
|Bore:||3.80 in (96.50 mm)dB|
|Stroke:||3.35 in (85.00 mm)Hz|
|Piston Displacement:||303.5 cu in (4937 cm^3)|
|Output:||315 hp/5600 rpm (245 kw/5600 rpm)|
|Max Torque:||347 ft-lb/3900 rpm (470 Nm/3900 rpm)|
|Max Engine Speed:||6000 rpm|
|Downshift points:||D to 3: 124 mph (200 km/h)
3 to 2: 79 mph (127 km/h)
2 to B: 46 mph (74 km/h)
|Rims - Tires|
|Rims:||7-1/2 J x 16 H 2|
|Tires:||235/60 R16 100H|
|Spark Plugs:||Bosch F8DC4 (org F9DC0)|
|Electrode Gap:||0.031 in (0.8 mm)|
|Tightening Torque:||15 - 22 ft lb (20 - 30 Nm)|
|Curb weight||4,785 lb; 1994, 4,695 lb|
|Trunk capacity||14.2 cu ft|
|Overall Length:||199.4 in (5065 mm)|
|Overall Width:||75.3 in (1912 mm)|
|Overall Height:||57.3 in (1455 mm)|
|Wheel Base:||115.9 in (2945 mm)|
|Track, Front:||63.1 in (1603 mm)|
|Track, Rear:||62.0 in (1576 mm)|
|Fuels, Coolants, Lubricants Capacities|
|Oil Filter:||8.5 US qt (9.0 l)|
|Automatic Transmission:||9.1 US qt (8.6 l)
Fluid change: 8.1 US qt (7.7 l)
|Rear Axle:||1.5 US qt (1.4 l)|
|ADS:||2.1 US qt (2.0 l)|
|Power Steering:||1.4 US qt (1.3 l)|
|Front wheel hubs:||2.1 oz (60 g)|
|Windshield washer:||5.3 US qt (5.0 l)|
|Cooling System:||16.4 US qt (15.5 l)|
|Fuel Tank:||26.4 US gal (100 l)|
Reminder: Don't Forget to Replace the Motor Mounts!
We trend to forget about the car's motor support, the infamous motor mounts! Well, you shouldn't! When the MMs collapse, crack
and split as shown, the engine effectively sits on the frame. All engine vibrations, and torque are transmitted into the
The MB S-Class has consistently defined the capabilities that modern passenger cars should aspire to. From performance and
comfort, to passive and active safety features, to reliability and durability, the S-Class has been an innovator and a
leader. Powerful, agile and reassuringly secure, an S-Class automobile imparts sheer driving pleasure and enduring
satisfaction like no other automobile in the world.
The gasoline-powered 5 liter engine uses four valves per cylinder to increase the engine's capacity to 'breathe'. The faster
and deeper the engine breathes, the more power it produces. To help improve torque at low and mid rpm, the intake-valve timing
of the engine automatically adjusts. The result is vigorous off-the-line launch and reassuringly swift passing power.
Much of what makes a Mercedes Benz a Mercedes Benz is the result of hand craftsmanship. The many Mercedes workers have learned
the arts of upholstery and woodworking and these are passed down from skilled masters.
The library quiet of the S500 is built to spirit the occupants over the road in security and elegance. Each is built to meet the highest expectations of its owner.
The Navigon GPS Car Navigation, Model 7100 guides you turn by turn to your destination with high accuracy. It provides voice guidance
prompts so you can keep your eyes on the road, while having the visual monitor for reference. It has been rated as very user
friendly due to its ease of use and many options available for choosing your destination.
Recent Interior Additions . . .
Thanks to various vendors, I've added a few extra enhancements to the interior. Also can't forget my wife's Christmas
present that you see below; a instrument cluster overlay. Came direct from MB in Germany so it's probably from a newer
S600 as a custom upgrade.
This section will highlight people that do unusual things to and about Mercedes-Benz cars.
I started about 4 years ago when a friend of mine in the insurance business told me about purchasing cars directly from him. At that time I didn't think much about it but now every 3 months I purchase a Benz, rebuild and sell it. Funny cause it's not for the money but rather a hobby. Besides nothing like seeing the end results of these beautiful cars!
I don't do this full time. I'm a Systems Administrator (MCSE) during the day and rebuilding cars is my hobby. The only thing I don't do on these cars is the welding, painting and well, now I will be able to reset codes thanks to your scanner. All else is done by me and sometimes with my wife's help! I don't have a web site but you are welcome to show off these pictures on your site. I'll send you pictures of the '89 190E 2.6 that I restored for my wife in the near future.
Click here to send email to Rudy:
DISCLAIMER - K6JRF Page
"My Mercedes-Benz S500 Coupe"
Mercedes-Benz is a trademark of Mercedes-Benz of North America, Mercedes-Benz USA LLC and other Mercedes-Benz corporations.
The words Mercedes-Benz is solely used to identify a make of automobile and do not imply or indicate any affiliation or
relation of the "My Mercedes-Benz S500 Coupe" with the manufacturer or their distributors.
Copyright © 2000-2010 by K6JRF.
. . . Victor's excellent site for MB repairs of Wiring Harness and Throttle Actuator called RestoreYourMercedes.
. . . A DIYer?? Find the needed repair info from AUDIO to WHEELs from MBZ.ORG.
. . . Diag Trouble Codes for 'E' class (190s, 300s, 320s) DTCs by Bat Automotive
. . . Pictorial DIY articles for Mercedes repairs at Peach Parts Wiki
. . . Find MB replacement parts at the Peach Parts Shop
. . . More places for MB replacement parts at the R&R Import Auto Parts
. . . Mercedes scanners, tools, test and diagnostic equipment at Technic Tool Supply
. . . Unique all-natural engine cleaner that works at Auto-RX. Not convinced yet?
Check out a well documented test on a high mileage '93 Nissan 240SX
. . . Repair/rebuild of Mercedes Climate Control Systems and
Electronic Throttle Actuator by Beckmann Technologies
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