Unfortunately, the upstream o2 sensor replacement did not fix the problem.
Just to give you a little extra info. I reset the check engine light before I replaced the o2 sensor, just to see if it would reset, and when I started the car after resetting, the CE light immediately came back on the moment I started the engine.
When I replaced the o2 sensor late last night and started the car the first time, I only let it run for about 30 seconds, but the CE light did not come on. When I left for work this morning, it did not come on right away, but when I went down my driveway and got out to open the gate, by the time I got back in the car the CE light was on. So that was before even making it out to the street and beginning to drive.
Not sure if all that info helps, but I thought I would mention it just in case.
So now I'm back to square one and need to continue diagnosing. I guess my testing of the old sensor was not accurate, because I was assuming the sensor was bad since I was getting no continuity on the sensor itself on the heater side of the terminals.
Should I move on to the downstream o2 sensor, or would you go a different way with diagnosing from this point?
Thanks!
Wednesday, July 19th, 2023 AT 9:57 AM