Check Engine light--ON
Thread Starter
Newbie
Joined: Jan 2006
Posts: 15
Likes: 0
From: MI
2000 E320 4Matic
Check Engine light--ON
The check engine light came on, on my 2000 E320 4matic. I had just refueled the vehicle 10 minutes prior to the light coming on. I re-tightened the fuel cap but the light is still on. The vehicle is running just fine and I have been driving for 2 days like this. the owners manual says it is a fuel system or emissions issue.
Any ideas before I take it to the dealerships and get raped.?
Any ideas before I take it to the dealerships and get raped.?
Member
Joined: Jan 2006
Posts: 178
Likes: 4
From: Austin, TX
2012 C250
I'd like to chime in here. I have a check engine light as well, but for an unrelated issue. I changed the plugs to see if that would fix the problem and went to autozone to get the codes pulled. for some reason, when the guy tried to erase the codes, they would not be erased from the system. what gives?
MBWorld Fanatic!
Joined: May 2005
Posts: 2,825
Likes: 3
From: New Jersey
things with and without wheels
If the problem is still there the code will not erase. As far as the other issue with the fuel cap , after few ignition cycles the light will turn off if the problem doesnt repeat it self.You can go to the dealer to get it looked at or you can go to the AutoZone and get it scanned for free and code cleared. 
Member
Joined: Jan 2002
Posts: 133
Likes: 0
From: SF Bay Area
E430
Go to AutoZone as others have suggested in other threads. You can either have them pull the codes or you can rent an OBDII reader for free.
I rented the code reader and got P0170 and P0173. All the info points to a bad air mass meter.
Tried to clean the meter and put it back in hoping that would solve the CEL, but no luck.
I have found one at here for 184 with free shipping. Anyone find this for less or have dealt with this company before?
http://www.drivewire.com/mercedespar...assmeter.html#
Good luck and let us know what error codes you get.
-travis
I rented the code reader and got P0170 and P0173. All the info points to a bad air mass meter.
Tried to clean the meter and put it back in hoping that would solve the CEL, but no luck.
I have found one at here for 184 with free shipping. Anyone find this for less or have dealt with this company before?
http://www.drivewire.com/mercedespar...assmeter.html#
Good luck and let us know what error codes you get.
-travis
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Member
Joined: Nov 2005
Posts: 213
Likes: 1
From: New England
2000 E 320S4 210.282 4Matic Estate
Elie,
Had the reserve light blinking, which is an indication of gas cap not sealing properly, which then triggered the Check Engine light to come on. I disconnected the negative cable from battery and caused the light to go out. Went well for about a week and then same thing repeated. Replaced gas cap ($17.00) and problem solved, I hope, since it's been over two weeks now.
Hope it helps.
Had the reserve light blinking, which is an indication of gas cap not sealing properly, which then triggered the Check Engine light to come on. I disconnected the negative cable from battery and caused the light to go out. Went well for about a week and then same thing repeated. Replaced gas cap ($17.00) and problem solved, I hope, since it's been over two weeks now.
Hope it helps.
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Thread Starter
Newbie
Joined: Jan 2006
Posts: 15
Likes: 0
From: MI
2000 E320 4Matic
Went to autozone and got the same codes as "fatchance did": P0170 & P0173. Looked at booklet for code explanation and it said Fuel pressure, MAF, O2 sensors.
Which one is it?
Had autozone reset the system, lite went off.
24 hours later it is back on.
I can try the gas cap since it is cheap.
Thanks all
Which one is it?
Had autozone reset the system, lite went off.
24 hours later it is back on.
I can try the gas cap since it is cheap.
Thanks all
Member
Joined: Jan 2002
Posts: 133
Likes: 0
From: SF Bay Area
E430
Elie,
I ordered up the MAS (mass air sensor) as all the searching I did on this site as well as benzworld.com pointed to this common failure with the fault codes I posted.
My CEL is off currently and the car is sleeping in the garage while I wait for the meter to arrive on Wednesday. Once the new meter is installed, I'll report back whether or not the CEL is off and stays off.
-travis
I ordered up the MAS (mass air sensor) as all the searching I did on this site as well as benzworld.com pointed to this common failure with the fault codes I posted.
My CEL is off currently and the car is sleeping in the garage while I wait for the meter to arrive on Wednesday. Once the new meter is installed, I'll report back whether or not the CEL is off and stays off.
-travis
Member
Joined: Jan 2002
Posts: 133
Likes: 0
From: SF Bay Area
E430
Just installed the new air meter and wow, I didn't realize the sluggishness until after the new meter was in place.
I did disconnect my battery after installing to clear any lingering throttle settings based on the faulty air meter hoping that adaptation would be faster.
All in all, it drives better than I expected after the replacement.
cheers,
-travis
I did disconnect my battery after installing to clear any lingering throttle settings based on the faulty air meter hoping that adaptation would be faster.
All in all, it drives better than I expected after the replacement.
cheers,
-travis
MBWorld Fanatic!
Joined: May 2005
Posts: 2,825
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From: New Jersey
things with and without wheels
I believe that there is an easier way to reset the settings in the ECM rather than disconnecting the battery, with the key on depress the throttle all the way and hold for 3 seconds?
MBWorld Fanatic!
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1967 Morris Cooper "S", 1983 911SC, 1997 Toyota Tacoma, 1999 HD FXSTB, 1998 C43
Next time do a search...not trying to bash you by any means. I did a write up on this now maybe three times on this forum. I purchased my car with a CEL since it was a steal and yanked the same codes...it was like the car was transformed follwing the MAF replacement. For your info, $184 is about as cheap as you're going to get on one of those - I purchased a Bosch through ebay for $200 with shipping.
Just so you know, the codes P0170 and P0173 are fuel trim, left and right banks, respectively. Buy an OBDII scanner....they are cheap now, you can even get it at Sears now.
Just so you know, the codes P0170 and P0173 are fuel trim, left and right banks, respectively. Buy an OBDII scanner....they are cheap now, you can even get it at Sears now.
