"check engine light" question *HELP*
Thread Starter
Member
Joined: Apr 2002
Posts: 229
Likes: 1
From: Bay Area, CA.
2001 CLK320, 2003 E320
"check engine light" question *HELP*
Had my check engine light flip on today and I immediately contacted the dealer. 
\They responded by first telling me to unscrew my gas cap and release any pressure build up which was probably the cause of the tripped sensor. I did that and still the light was on. The service advisor told me to drive around for a few days and see if the sensor would reset itself if not to bring it in.
My question is… is this bull****??
What are the possible problems for the “Check Engine” to go on..?? Should I even be driving it? I don’t want to make the problem worse.
Any info is greatly appreciated.
\They responded by first telling me to unscrew my gas cap and release any pressure build up which was probably the cause of the tripped sensor. I did that and still the light was on. The service advisor told me to drive around for a few days and see if the sensor would reset itself if not to bring it in.My question is… is this bull****??
What are the possible problems for the “Check Engine” to go on..?? Should I even be driving it? I don’t want to make the problem worse. Any info is greatly appreciated.
MBWorld Fanatic!
Joined: Jan 2003
Posts: 6,278
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From: Windermere, Sunny FLA
CLK55, CL500, Q45
He probably figured you were one of the elderly crowd who
fills up gas, and didnt tighten the cap. Yes if you dont make
it tight, you will loose pressure in your tank, causing a check
engine light. Seriously though, it sounds like something else.
Mine just came on last week for a few days, and I found out
that its caused by a MAF which is on its way out, so I have
the part on order.
fills up gas, and didnt tighten the cap. Yes if you dont make
it tight, you will loose pressure in your tank, causing a check
engine light. Seriously though, it sounds like something else.
Mine just came on last week for a few days, and I found out
that its caused by a MAF which is on its way out, so I have
the part on order.
MBWorld Fanatic!
Joined: Jun 2002
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From: Las Vegas, NV USA / London, UK
GL320CDI / C63 Edition 507 Coupe (EDP) / E63 S (on order) / G500 / Smart Brabus
If the CEL is activated because of a fuel system leak (vapor canister, loose gas cap) or bad readings from the O2 sensor, and these errors are later corrected, the light will go out after a certain amount of time... until it happens again. If it goes out and comes back, or doesn't go out, it's best to bring it in and have the codes pulled to tell you what it is.
I had a single marginally bad O2 sensor that on hot days, would light up my CEL when I got on the gas. The next day it would go out for a while. I eventually replaced it myself. Also I had a leak in the vacuum canister line. This starts off with a blinking empty fuel tank light (same as with the loose gas cap) and then turns into a full blown CEL.
-s-
I had a single marginally bad O2 sensor that on hot days, would light up my CEL when I got on the gas. The next day it would go out for a while. I eventually replaced it myself. Also I had a leak in the vacuum canister line. This starts off with a blinking empty fuel tank light (same as with the loose gas cap) and then turns into a full blown CEL.
-s-
Thread Starter
Member
Joined: Apr 2002
Posts: 229
Likes: 1
From: Bay Area, CA.
2001 CLK320, 2003 E320
*Update*
After reading other threads on this I decided to unplug and plug the MAF and sure enough the CEL went off.
You guys think I should still take it in? Do I have a bad MAF?
Thanks in advance..
You guys think I should still take it in? Do I have a bad MAF?
Thanks in advance..
Newbie
Joined: Dec 2004
Posts: 13
Likes: 0
From: Fort Worth, TX
CLK430 designo
Mine did that and they said it was the oxygen flow sensor when I took it in. It was under warranty, so no big deal. Guy told me to replace the air filters and that would keep it from happening.
MBWorld Fanatic!
Joined: Nov 2002
Posts: 1,438
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From: Genoa, NV
2014 GLK250 BlueTec & 2009 ML320 BlueTec
Ahh, all this electronics. In the good all days, all you had was an oil pressure light, if you have oil in your engine, what else can damage it?
My wife's mini van check engine light came on at 50,000 miles, and the dealer wanted $240 for the oxigen sensor, so we droved 70,000 miles more until we sold it with the check engine light still on!
My wife's mini van check engine light came on at 50,000 miles, and the dealer wanted $240 for the oxigen sensor, so we droved 70,000 miles more until we sold it with the check engine light still on!
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MBWorld Fanatic!
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From: Hotlanta
AMG
Originally Posted by 2001CLK
After reading other threads on this I decided to unplug and plug the MAF and sure enough the CEL went off.
You guys think I should still take it in? Do I have a bad MAF?
Thanks in advance..
You guys think I should still take it in? Do I have a bad MAF?
Thanks in advance..
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MBWorld Fanatic!
Joined: Jan 2003
Posts: 6,278
Likes: 14
From: Windermere, Sunny FLA
CLK55, CL500, Q45
ok, does anyone know how to change the MAF? I am not sure
where it is located, or how to fix it, but have a bit of tech
knowledge. If someone can explain it to me, I am sure I can
figure it out.l If anyone can help me out, just post up the
directions, or PM me. Thanks in advance!
where it is located, or how to fix it, but have a bit of tech
knowledge. If someone can explain it to me, I am sure I can
figure it out.l If anyone can help me out, just post up the
directions, or PM me. Thanks in advance!
