All 4 O2 Sensor Failure

[Liv'n Life]

Ok, I have read through several threads on this and tried many of the suggestions to no success. CEL came on. Codes indicate that all 4 O2 sensors are bad, however they were literally just replaced last year with NTK's, along with the exhaust system.

2004 LJ / automatic

Here is what I have tried:

- Checked ground from block to firewall
- Checked wires for the sensors
- Broke down and bought 4 new sensors (NTK)
- Had a spare PCM - tried that

The pre-cats and cat were replaced last year (along with all 4 O2 sensors). Probably less than 3k miles ago.

I am at a complete loss at this point... any suggestions much appreciated.

 

[ItchyDong]

The code would really help.

 

[Liv'n Life]

The code would really help.

P0051, P0031 (the other two disappeared)
Now also suddenly reading: P0455, B1801, P3600, P00B8 and P0442

 

[Jerry Bransford]

What brand of O2 sensor did you install?

 

[Liv'n Life]

What brand of O2 sensor did you install?

NTK's both times (as recommended by most everyone on this site). They worked fine for about a year with no issues. I don't think it's the sensors but we replaced them again (with NTK's) and still have codes. Something weird is going on.

 

[AndyG]

NTK's both times (as recommended by most everyone on this site). They worked fine for about a year with no issues. I don't think it's the sensors but we replaced them again (with NTK's) and still have codes. Something weird is going on.

I think you need to look close at your wiring harness- And maybe even get @Wranglerfix in the equation- All four of those are not just going to fail at one time.