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Search Auto Parts Search What sound is my car making? Exhaust trouble? Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Exhaust System Repair Feliponius New User Jun 24, 2016, 4:16 PM Post #1 of 4 (2065 views) What sound is my car making? Exhaust trouble? Sign In I have a: 2002 Nissan Altima 2.5l 4-cyl with around 150k miles on it. Recently I had my P0138 (Bank 1 Sensor 2 O2 Sensore Voltage) code come on in my car. I've been having trouble with power loss and my gas mileage being reduced. I recently replaceced my Pre-Cat and it seemed to fix the power loss, but now I'm getting a definite putter or possibly a knock coming from the engine when under load. I've included a video so you can kind of hear what I'm hearing. Anyone know what I'm dealing with here? https://www.youtube.com/watch?v=lrb2RB7dlKo Thanks in advance! Hammer Time Ultimate Carjunky / Moderator Jun 24, 2016, 4:22 PM Post #2 of 4 (2061 views) Re: What sound is my car making? Exhaust trouble? Sign In That code does not refer to pre-cat sensor. It's a downstream sensor. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. Feliponius New User Jun 24, 2016, 6:48 PM Post #3 of 4 (2053 views) Re: What sound is my car making? Exhaust trouble? Sign In There are two sensors built into my pre-cat...cat? My car has two catalytic converters. The pre-cat (a converter built directly into my exhaust manifold) has two O2 sensors attached two it. One above the catalyst (upstream) and one below the catalyst (downstream). Discretesignals Ultimate Carjunky / Moderator Jun 24, 2016, 7:35 PM Post #4 of 4 (2048 views) Re: What sound is my car making? Exhaust trouble? Sign In Sounds like an exhaust leak to me. Maybe when you brake torque the engine an exhaust part moves and leaks. Possible flex pipe? Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.   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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