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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   Drive Shaft Repair I have a 2015 Chevy Traverse AWD. The fr...   2006 Toyoto Camry XLE Driver Side Electric Window Trouble Hello, Looking for a little brain help ...   Tierod end change caused some kind of leak Hello so I just took my car to the nearb...   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...

Search Auto Parts Search o2 sensor exhaust problem Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Exhaust System Repair bayview512 New User Sep 17, 2023, 9:33 AM Post #1 of 4 (34014 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 (34007 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 (33957 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 (33954 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.   Email This Post   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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