Car Issue after replacing O2 sensors and oil change.
I just recently replaced my bank 1 and 2 O2 sensors in my car. Right after that I did my routine oil change. Since then, my car has been running very rough. Prior to replacing the sensors, everything ran fine with the exception that I was getting an error code stating my O2 in bank 1 and 2 were running lean. On a recommendation, I replaced them. Now I am getting a Cylinder 4 miss-fire and I'm getting a O2 in bank 2 running lean. My car idles very rough now and I feel a loss of power as I accelerate. I have no idea what could be happening as I haven't done anything drastic other than the oil change and sensor replacement. It's very frustrating and I can't really afford to take it into a shop. Hoping it is something I can do on my own.
I have an 05 Taurus with the regular 3.0L V6 engine.
Vacuum leaks???? Plenum gasket good???? Check coil and the wires for hot spark of at least an inch???? You might have bumped something loose when doing the work.
Make a very thorough check of hoses and wire connections. Good luck~~
+1^ because your O2 sensors were reading lean that means something upstream is causing a lean mixture, possibly a vacuum leak or your MAF is dirty and reading wrong causing a wrong mixture. but its a problem upstream of the sensors, since your sensors are letiing you know hey check this out!
Thanks everyone for the feedback. This gives me something to go on and check out what the issue could be. There is a possibility that I may have bumped something when I was removing the bank 1 sensor as it was a bit of a pain to get to. Will post my results once I find out some answers.
I tried the spark test and I was getting a spark from all of the coils except for #4. Since I need to get new cables anyways to do a tune up, I'm getting a set of cables on order and I will start be replacing the cable on #4 before I go to the next step. I checked all of my Vac hoses and lines and those appear to be ok. I don't have the hissing sound as the one guy in the video noted about being a good sign of a Vac leak.