check engine light on - PeachParts Mercedes-Benz Forum

chago · #1 09-10-2008, 06:39 PM

Hi I need help. got glowplug light and check engine,engine electronic light. Car starts and runs fine.

Thanks chago

toomany MBZ · #2 09-10-2008, 06:52 PM

What car please.
On a 617 engine, the GP light, lack thereof, indicates a GP problem.
On a newer American gasser, the check engine light concerns the emission system.
Good luck, keep us posted.

TMAllison · #3 09-10-2008, 06:53 PM

96 or newer? Mercedes?
(Add your car to your signature, go to USER CP, EDIT SIG)

Go to dieselgiant.com and follow the GP test procedure there for the W123. The relay is a lil bit different but the principles are all the same.
Then you'll know if it is a GP or the relay. If realy, try cleaning the electrical plug.

chago · #4 09-10-2008, 07:02 PM

Quote:

Originally Posted by TMAllison

96 or newer? Mercedes?
(Add your car to your signature, go to USER CP, EDIT SIG)

Go to dieselgiant.com and follow the GP test procedure there for the W123. The relay is a lil bit different but the principles are all the same.
Then you'll know if it is a GP or the relay. If realy, try cleaning the electrical plug.

It's a 98 e300td

Hatterasguy · #5 09-10-2008, 10:23 PM

Get the codes scanned!

chago · #6 09-12-2008, 03:34 PM

Quote:

Originally Posted by Hatterasguy

Get the codes scanned!

I will have it scanned by sunday.

TMAllison · #7 09-12-2008, 03:48 PM

In the mean time you ought to test the GP's and relay cause one or the other is def involved becaue the GP light is lit up.

Warren C · #8 11-26-2008, 01:39 AM

I have the same issue...99 E300D

.......both the CEL and the glow plug light stay on after the engine is started. Car starts and runs fine.

I've had this occur before and after a week or so,.... both went out ??????? Not this time though ...in over a week.

Since it's starting and running OK...can damage occur if I don't fix it right away.

What's happening while the engine is runnng with the glow plug light on? Is one or more of the glow plugs still on?

Is there a step-by-step guide here for diagnosing glow plug problems?

Warren C.

Moorewr · #9 11-26-2008, 06:14 AM

My 96 E300D check engine light came on, I got out, checked engine had one, called dealer, said if all indicators (oil/temp, etc) were in the green, ok to drive. took it in and the co2 sensor needed replacing.
FWIW.
ron

TMAllison · #10 11-26-2008, 10:07 AM

Quote:

Originally Posted by Warren C

Is there a step-by-step guide here for diagnosing glow plug problems?

Warren C.

Indicates a GP issue usually. Go to Dieselgiant.com and follow the tutorial for the W123. Same principals on our cars; relay is a bit different.