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Ever since I got my 5.5" Rubicon Express lift and started running 315/75/16 tires my check engine light has been coming on intermittently. It has now been on for two days and I decided to get it diagnosed. This is what the report said:

Definition: HO2S 12 circuit condition (Heated oxygen sensor) bank 1 sensor 2

Explanation: The powertrain control module uses the oxygen sensor to calculate the air/fuel ratio in the exhaust.

Probable Causes:
1. Oxygen sensor defective
2. Fuel system running very rich or lean-check other codes first
3. Engine misfire condition-repair
4. Fuel pressure very high or low-fuel pump or pressure regulator

I was just wondering if any of you guys have had this problem in the past after lifting and modifying exhaust. Please let me know if you have any info that could be helpful.
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