hi,
a week ago i got engine light on and codes 0810, 0814 on star
, i deleted them and drive a after a week a new codes apear 0745,0749
what can be the reason
the car is w204 c300 2008 3.0 v6
thanks

 

0810 & 0814: https://mbworld.org/forums/c-class-w...10-0814-a.html

0745: https://mbworld.org/forums/c63-amg-w...-manifold.html

0749: https://www.yourmechanic.com/article...for%20shifting.

0749 is the one I'd be the most concerned with.

Google be your friend!

 

thanks but this are star codes and has difrent meanings , i read the treads , but my question is why and how its possible that completly oposite codes apear a week after?

 

I haven't used Star for a while. I don't remember seeing different codes. Is there a description with the codes?

 

here are the codes, 0810 0814- is a week ago

 

Seems like you have a vacuum leak somewhere. It sounds like the secondary air injection system (which pumps air into the exhaust at startup to speed up heating up the O2 sensors) is malfunctioning. That may lead to the lean condition, or something else. I would check all hoses and vacuum lines for cracks or splits.

Have you done any work on the engine lately? You may want to take it to a shop that knows Mercedes and have them check it out. There's a test called a smoke test where smoke is pumped through the intake with the engine OFF to detect any leaks.

 

here are the codes, 0810 0814- is a week ago

 

i had the camshaft magnets replaced and oil filter,oil and air filter replaced few weeks ago

 

the air pump is working, i checked in the morning when the engine is cold

 

So, there may be some damage to a vacuum line somewhere. A smoke test would help show where, if that is the problem.

I know the lean conditions are probably determined by the pre-cat O2 sensors, but it is strange that they would both fail at the same time.

Did you replace your camshaft magnets yourself? And why did you replace them?

 

i didnt replace them myself, i did it due to another check engine light , thats gone..

 

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