Help!!! (evap leak, rear O2 sensor, misfires)
 

okkay so last week my check engine light came on so i went and had codes ran and it came back as evap leak (small) well 2days later the light had went out so i didnt have any concern to it. 5days after that the light came back on only this time the code was for not just the leak but also my heated o2 (bank 1 sen 2) an the next day yet another code this time misfire cyclinder 2.. so now im not sure what cause all of this i was thinking more of the oil metering pump but i wanted to see what others had to say about this mishaps:Eyecrazy:

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Edited thread title to reflect content.


Also moving it to the Troubleshooting thread rather than the Tech Garage.



The evap code when it comes and goes is 90+% of the time just a loose gas cap. Sometimes needs a replacement gas cap, and the very rare portion is an actual evap leak from somewhere else in the system. The evap system is related to your gas tank fume capture, and not your O2 or misfire codes.


The O2 code could be any one of 4(?) different codes. Which one is it exactly?

Misfires are usually failing ignition, but could be caused by anything in this list:
- failing plugs
- failing wires
- failing coils
- ESS fouled
- MAF dirty
- airfilter dirty
- intake vacuum leak
- cat failing
- front O2 sensor failing (bank 1 sensor 1)
- compression loss
- electrical ground problems

and a handful of others.

Your rear O2 sensor (bank 1 sensor 2) can not cause misfires that I am aware of.




Looks like you have 3 different problems

Bad gas cap.

Bad ignition coils.

Clogging catalytic converter.