xj4mud
NAXJA Forum User
- Location
- Northern California
I have a 96 4.0 auto that runs good but will not pass smog check. Emmisions are excellent but it fails the OBD check. It does not have any codes in memory but it does not complete all it's self diagnosis checks. I have hooked up a scanner and watched it complete all but the HEGO sensor check. I have replaced the HEGO sensor and checked all the wiring. I am now wondering if it is the CPU causing my headaches. Anyone have any ideas of what this could be or what I should check?