Hi

The C180' (2003) (78K) I have is giving missfire codes on cylinders 1, 2, and 4 along with mixture too rich ???

In general the car runs OK when moving, but idles roughly from time to time hence the errors codes.

I have replaced the spark plugs as an obvious first step with no improvement, swapped ignition coils, no improvement.

Could all of this be all due to a faulty lambda sensor or is it something deeper ?

Thanks for reading.

Would appreciate your thoughts.

Regards, Steve.