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o2 sensor exhaust problem Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Exhaust System Repair bayview512 New User Sep 17, 2023, 9:33 AM Post #1 of 4 (34934 views) o2 sensor exhaust problem Sign In i have a 2007 jeep liberty and the engine light came on. after testing the error showed o2 sensor bank 1 sensor 2 was bad. i changed both banks 1 and 2 sensors 2. after driving a few minutes, engine light cam back on, the obc readout showed codes p138 and 158 which were now high voltage on both new sensors. so it seems the sensors are now good so what should i be looking at since there appears to be a rich fuel problem. Hammer Time Ultimate Carjunky / Moderator Sep 17, 2023, 11:23 AM Post #2 of 4 (34927 views) Re: o2 sensor exhaust problem Sign In The first thing you need to learn is that there are NO codes that confirm a part is bad. They merely inform you of a condition that needs to be further troubleshooted. There are dozens of 0/2 related codes that all mean something different. The dead giveaway on this one is that both rear sensors are setting the same code. You are also wrong about it being a rich condition also as fuel mixture and control are done by the front sensors. The rear sensor are for Cat monitors only. In this case you have a short to power on the signal lines which could be a problem with the wiring harness or the PCM itself. It definitely requires some in depth electrical testing to locate the cause. I would start by simply inspecting the harness closely looking for anywhere it could have been burned on the exhaust or somehow otherwise damaged. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. bayview512 New User Sep 18, 2023, 7:17 AM Post #3 of 4 (34877 views) Re: o2 sensor exhaust problem Sign In thankyou for your feedback Hammer Time Ultimate Carjunky / Moderator Sep 18, 2023, 7:19 AM Post #4 of 4 (34874 views) Re: o2 sensor exhaust problem Sign In You're welcome ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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