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 a