how do I know which O2 sensor is bad? my check engine light was on and I had a friend plug in a diagnostic tool which said bad O2 sensor but doesn't state which one
4 Answers
Changed upper and lower 02 sensors check engine light still stays on
2006pt cruiser changed on sensors upper and bottom check engine light still stays on code p0038 lower sensor is new
Have to get you hand on a tool that tells you which bank it's on that's how you know bank 1 one side bank 2 other side which ever side ots on. Then do this other which it will drI've you crazy lights stay on after cleared... so clear codes then Sorry I forgot something my PT cruiser 2005 what worked for me I took the gas cap off replaced the fuel.pump relay and the ASD relay and it started had to drive it about 70 miles for the light to stay off after all was cleared this works for new 02 sensors as well to get the light to stay off. Pay it forward please Chrysler won't tell you this they point you to PCU... in some cases it may be PCU but not all I find it hard to believe. Hope it works!
