A month ago, the CEL started throwing three codes (all at the same time):

0303 (o2 sensor)
0304 (knock sensor)
0807 (evap canister purge valve)

I figured it was probably the o2 sensor (even though I put a new one in 2 years ago when I installed my y-pipe) causing all the codes, so I replaced it and reset the ECU. While the o2 code hasn't returened, the KS and evap keep coming back.

Has anyone seen all these codes at the same time, and is there a common cause, or did all three items randomly go out at the same time? Car has 120K miles on it.

Thanks in advance !

Dave

 

those 3 items have nothing to do with each other. 3 fixes.

 

Thanks. I heard the o2 sensor sometimes causes the knock sensor code, but I guess not in this case. It also seemed strange that the other 2 codes keep appearing at the exact same time (sometimes after three drives, sometimes after a month).

The car has been hesitating at higher RPM's, and I suppose the KS could cause it. Sounds like fun replacing the KS. Better get started. The canister valve looks good (no broken / cracked hoses, even though the strut brace is close). I'll test it as well.

Thanks

 

I actually got the 0304 and 0903 (EVAP canister vent control valve) codes, and once I replaced my KS and reset the ECU, the 0903 never came back. Pretty weird eh?

 

good to know. i'm gettin an 0304 code @ 90k miles and 2 other codes as well. one of which i replaced the part and reset the ecu and it still came back.