p3nn Posted October 17, 2018 Share Posted October 17, 2018 Morning Chaps, I've had my 350z for about a year and loved ownership so far. After going down to Wales Rally GB i seem to have developed a fault. ODB2 errors: P0420 - Pre Cat O2 Sensor (i think) P0303 - Misfire cylinder 3 So it started with a engine warning light that you could clear which would come back after a week but the car was running fine. Now the car has had a misfire that progressively has got worse on cylinder 3. Now it's pretty much undriveable, i've got it to and from work but it sounds like a tractor and there's a lot of vibration. Ordered some new sparks and trying to find a O2 Sensor. Won't get chance to get it into the garage/up on the ramps till Saturday. Any suggestions? Would a coil pack help this? Thanks in advance, Matt Quote Link to comment Share on other sites More sharing options...
ShortPaul Posted October 17, 2018 Share Posted October 17, 2018 Quote Link to comment Share on other sites More sharing options...
p3nn Posted January 20, 2019 Author Share Posted January 20, 2019 Replaced Injector on cylinder 3. This resolve the misfire, still having issues with O2 Sensors now though. Quote Link to comment Share on other sites More sharing options...
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