Good afternoon everyone, having issues with my c230 p2237 and p2240 code, swap all four 02 sensors still getting the codes. No oil leaking no issues with grounds and cleaning all connectors with safe electric cleaner. I do have a scanner that can read trims etc etc need help thank you

 

you should check the wiring and power supply of these lambda sensors because it is not possible that both of them are damaged.



Did you also have an error with both probes before the replacement?

 

so I actually sent in my ECM and my PCM was fryed so I had to get it replaced, in theory I’m guessing those 02 sensors was good I guess I was doing PROCESS OF ELIMINATION. And was hoping it wasn’t the ECM