2016 Chrysler town and country 3.6L misfiring, got code for misfire cyinder number 2, change spark plug and ignition coil. Seems okay, drove for four days misfiring again. Then code for bad 02 sensor appears, change drove for a few more days and was okay. Then another misfire on cylinder number three appears. What could possible be the cause of this? engine seems okay. When plugs were removed they were clean no oil etc. My mechanic think it's the Power control module. I just replaced the engine it as under 70000k. Do I have to do something to the computer after changing the engine?

 

First of all did he just replace one spark plug? if so why ?? Second whats the code for the 02 sensor. Just because the word O2 is in the DTC description doe not mean its automatically an O2 sensor. As for being a pcm highly doubt it. the pcm is doing ts job by turning the lights on what what ever the issue is.

 

He only changed spark plugs and coils for cylinders that were misfiring.

 

thats kinda stupid I would say at least do all spark plugs and just a coil for the one misfiring. so still need code numbers