DesertDog401

Ok I am lost, for a few years my check engine light has been on and I know it's due to a bad O2 sensor on exhaust. Keep started dying randomly so I changed crank sensor and went ahead and did O2 sensor. Everything g was good but check engine light came back on, I ran diagnostic with no codes found. Unplugged battery and plugged back in. Good for a week and boom, it comes back on, still no codes found. Any ideas?

CCKen

Look for a 'pending' code.

DesertDog401

I did and it showed nothing

CCKen

Try a different code reader/scanner. Some code readers and/or scanners need to be programmed for Jeep.

Jeep Driver

Which 02? bank 1 or 2?


If you only did upstream........your downstream is causing the CEL.

DesertDog401

Not sure, the light is being bipolar. It sometimes turns off for awhile then back on.

CCKen

Check the O2S Heaters fuse in the PDC.


Verify the O2S wiring loom crossing the intake manifold is not chafed through to the wires.


Verify the rear O2S wiring is okay.


.

DesertDog401

Can you repost the picture, it says error

CCKen

What picture? The PDC?


It shows up on my screen.

DesertDog401

I will have to try from my computer

Turbo X_J

This is OBD2 are you using an actual scan tool or relying on the odometer?

DesertDog401

And actual scan tool