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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3567
Experience:  Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
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PETE My 2006 ML 350 has always had it's check engine light

Customer Question

HI PETEMy 2006 ML 350 has always had it's check engine light on. Shortly after I purchased it used in 2010, it came on.
I've rebuilt the transmission, that worked for a while
then, rebuilt the engine, that worked for a while
now mechanics are telling me it's the control module or wiring harness..what can you tell me about this car that the check engine light always comes back on
Submitted: 1 year ago.
Category: Mercedes
Customer: replied 1 year ago.
I'm currently looking a selling it, if the repair costs are more than 2000, however, it seems that even after I fix whatever problem is wrong and the gods turn off my light, i know it will come back on. I'd like to keep the car, but I'm at it's mercy, which is where I think Mercy'des' gets it's name...
Customer: replied 1 year ago.
Help. what should I do at this point, if it's the control module, or wiring harness, I'm told by a reputable local mechanic that those parts have to be replaced by Mercedes, is that correct, due to the antitheft programming? In your opinion what should I do?
Expert:  Lou P. master tech replied 1 year ago.

lol, quite the story, what is the code? from the check engine light?

Customer: replied 1 year ago.
what code?
Expert:  Lou P. master tech replied 1 year ago.

well if the check engine light is on, there will be a fault code indicating why the light came on

Customer: replied 1 year ago.
i only have what the car repair place told me...let me see if I can find the report
Expert:  Lou P. master tech replied 1 year ago.

ok, ill wait

Expert:  Lou P. master tech replied 1 year ago.

check engine lights can come on for 1000 different reasons, as since yours is a first year of production ML i can tell you that that model has had many issues , they worked out the bugs around 2011. but the first year was problematic.

Expert:  Lou P. master tech replied 1 year ago.

the codes start with a "P"

Customer: replied 1 year ago.
I'm calling the car place that looked at it for me..they did't give me a report.
Expert:  Lou P. master tech replied 1 year ago.

ok, i have to leave for a few , but i will get emails when you respond, so no worries i will reply back, Lou

Customer: replied 1 year ago.
sure, no worries
Expert:  Lou P. master tech replied 1 year ago.
Ok. Great.