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Old 10-29-2013, 12:53 AM   #1
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Check Engine Light

My check engine light came on at 2000miles, took to MB dealer they replaced a faulty emission sensor. The light went out before the sensor arrived at the dealer but they replaced it anyway. At 6150 miles and 2 months later the light has reappeared! RV dealer suggested we cycle the ignition several times to allow the system to reset? Any thoughts??
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Old 10-29-2013, 01:44 AM   #2
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My check engine light came on at 2000miles, took to MB dealer they replaced a faulty emission sensor. The light went out before the sensor arrived at the dealer but they replaced it anyway. At 6150 miles and 2 months later the light has reappeared! RV dealer suggested we cycle the ignition several times to allow the system to reset? Any thoughts??
dealer is full of it.dis-connecting the battery may reset it. cycling the key will do nothing. depending on what kind of chassis you have it could be a code that will only erase by scan tool. other than that it may take 50 ignition/run cycles or 50 engine coolant and ambient air equalization cycles (sits over night 50 times) you have an issue and as long as it isn't a P0442 small evap leak detected (many times a loose gas cap or cracked gas cap seal but a myriad of other small evap leaks The first two are just the most popular) they are wrong. have them check it again, and fix it right. some O2 heater ckts will intermittently do this. there are a few that must meet acceptance criteria of speed temp and duration, and these can take hundreds of miles under certain conditions to do so. they are very tough to diagnose as well.

I will admit CEL can be a pain to diagnose but it aint gonna fix it self. there are a few that are driver induced by over filling the fuel tank and putting it in park before the computer sees zero speed sensor signal but these are unlikely your problem.

you may want too invest in a cheap generic scan tool so you can 1. know what code is stored and document ans 2. erase it if it is a recurring intermittent code.

good luck
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Old 10-29-2013, 06:14 AM   #3
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May be a different issue. Should get it checked out. I am assuming since may auto parts stores will check the codes on cars for free they may check a motorhome as well. But they usually will not reset it. As above having a cheap code reader is nice peace of mind & easy to reset a code. It may just be a loose gas cap, could be your original problem but it could be something else as well......As Wilem says should get it checked out...... Good Luck.........
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Old 10-29-2013, 08:07 AM   #4
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You may want to look into a Scangauge or an Ultraguage. They can both be used to read and clear codes.

I keep my Ultragauge connected all of the time to read various operating parameters that are not available directly on the Mercedes dash.
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Old 10-29-2013, 12:38 PM   #5
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That happened to me. It came on. So I took it to the MB dealer. They said it was the NOX sensor and replaced it under warranty. 500 miles later the light came on once more. Went back to MB dealer. It was the other NOX sensor. There are two of them. Lucky for me that emissions equipment is warrantied for 70,000 miles.

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Old 10-29-2013, 01:47 PM   #6
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At 2200 miles I had a fault light related to DEF fluid. It did not need DEF fluid. Took it to MB dealer and at first they speculated there was a problem with the DEF tank. Service manager also stated there was a firmware upgrade for the engine computer. They upgraded the firmware and the fault code disappeared, and has not reappeared after 5000 more mile. You may want to have them check for latest version of engine computer software/firmware… Faulty firmware may present other/different fault codes!
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Old 10-29-2013, 10:29 PM   #7
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At 2200 miles I had a fault light related to DEF fluid. It did not need DEF fluid. Took it to MB dealer and at first they speculated there was a problem with the DEF tank. Service manager also stated there was a firmware upgrade for the engine computer. They upgraded the firmware and the fault code disappeared, and has not reappeared after 5000 more mile. You may want to have them check for latest version of engine computer software/firmware… Faulty firmware may present other/different fault codes!
sometimes a flash will simply eliminate that parameter from setting

in the late 90s DTCs..mitsubishi had a code 111 that if it came into the dealer with that code 3 times it was a very big deal. as in the manufacturer was to be called to determine the course of action. and buy back was not ruled out.
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Old 10-30-2013, 12:12 AM   #8
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Thanks to all of you! I'm contacting the MB dealer in the morning and I think there is a scanner in my future. Thanks again.....PaDawg
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Old 10-30-2013, 12:32 AM   #9
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PaDawg, report back on this for all of us. Thanks
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Old 10-30-2013, 12:37 AM   #10
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Nats, does the Ultragauge draw any power when connected and ignition is off? Where and how did you mount it?
Thanks Hans
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