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Xterra4x4 - in a word, no. I would normally perform a post-mortem evaluation on a failed or replaced component, or compare it to its intended replacement. However, since the condition reported by the ECM (bank 2 lean) did not match the actual circumstances, and the fresh sensor turned the CEL...

As promised, the latest... Replaced the right upstream O2 sensor this afternoon. Got in to drive to my parts store (where they wear the green shirts) and clear the codes, and upon starting the engine, the CEL was dark and the idle speed was right around 900 RPM and steady. Time will tell, and...

Replaced right side upstream O2 sensor, and kinda wish I hadn't; pretty sure I found that the oil we've been losing is running out the rear main seal...

Thanks, Dad'! Good advice on the grounds and wiring. I will be looking at these items in the process. My rationale for being ready to condemn the right upstream O2 sensor, and nothing else at this point, is that for now the DTC is isolated to the right side; MAP sensor seems like it would show...

Greetings, all. I'm new to the forum, but not to the Liberty. Here's the skinny - my wife was just starting on a 550-mile trip in her 2006 3.7 Liberty when she saw the CEL illuminate. Continued the trip without catastrophic incident and made it home fine, but the Jeep used about twice the fuel...