M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

not another "check engine light" thread!!

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Old Dec 9, 2003 | 03:41 PM
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not another "check engine light" thread!!

well I guess it had to happen to me sooner or later....two days ago, after the big snow,I was trying to park my truck on my front lawn. Its on a slight hill and there was a good size snow bank. I got the truck halfway up into the spot and my tires started to spin....so I hammer the throttle to get it going and my check engine light comes on. The truck runs fine. I gassed her up the day before...possibility of water in the tank (due to the snow on my truck). Checked the gas cap...seems on pretty tight!

can't get to the dealer until Dec 30th!! If it goes out between now and then should I just forget it?

Is it OK to be driving her this whole time with the light on?
can I be causing any damage? What should I be looking for?

Could it have just been a coincidence that I was hammering her in the snow when the light came on?? The service rep seems to think the two are unrelated! I disagree...thats why I am so nervous. If the light came on at anyother time then I wouldn't worry...but she was slipping and I kept gassing!!
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Old Dec 9, 2003 | 04:16 PM
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'82 turbo yugo
Re: not another "check engine light" thread!!

Originally posted by Stiggs
well I guess it had to happen to me sooner or later....two days ago, after the big snow,I was trying to park my truck on my front lawn. Its on a slight hill and there was a good size snow bank. I got the truck halfway up into the spot and my tires started to spin....so I hammer the throttle to get it going and my check engine light comes on. The truck runs fine.
Could you have packed enough snow underneath so that you dislodged an o2 sensor?

If the ML has a sensor before and after the cat ( I think they do) and you introduced an exhaust leak or ripped the sensor out completely that would pop the CE light.
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Old Dec 9, 2003 | 07:01 PM
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hmmmm...thats a good thought...it was a good size snow bank I was driving through (probably a little higher than the running boards).
If it is the O2 sensor, will the light go out by itself? does this damage the truck?
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Old Dec 23, 2003 | 12:59 AM
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If you knocked the o2 sensor out of the exhaust you would hear a difference...no question....You may have gottem water in the connector and shorted it out...I have seen water get into those connectors a lot
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Old Dec 23, 2003 | 06:49 PM
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ooops ...posted this question again in ML God's other thread.
I think I found a pattern...of course hasn't happened enough for it to be a pattern. The light seems to come on the very next day after a fill up at a gas station. I know the gas cap can cause the light to come on, so I think this must be it. There is no sound difference coming from the engine. The light did go off after about a week or so....just as someone else on this board said...the computer has to cycle so many times until it shuts the light off.
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Old Dec 24, 2003 | 02:26 AM
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See your other post
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Old Dec 24, 2003 | 09:08 PM
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Thanks for the help, I will post an update after I get her back from the dealership on the 30th of December. I'm hoping its something cheap.
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Old Jan 2, 2004 | 09:37 AM
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Update on check engine light.....

getter my baby back from the dealership today. It was the mass air flow sensor. cost...over $500. Damn that better be an important sensor. Oh well have to get it fixed. Emissions testing is next week!
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Old Jan 5, 2004 | 09:58 PM
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That's not under warranty? I thought it was considered a major component. We had discussions with MB over this! 1999 under 100Km.
Don't know how it works in the states.
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Old Jan 5, 2004 | 11:34 PM
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MAF replacement

Funny--my BMW M3 had "check engine" light problems a couple months ago and it was the same thing. A new MAF sensor fixed it.
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Old Jan 6, 2004 | 09:58 AM
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Original factory warranty is up..I believe its 4 years/50,000.
My 1 year starmark is already up also...that ran up in Oct 2003. Perfect timing!!
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