Question about 2006 Nissan Maxima

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I have a 2006 Nissan Maxima and it is causing me problems. Check Engine light came on about three months ago but drove fine. No loss of mileage or anything. Did not pass smog do to a P2A00 code (O2 sensor is what i'm told). Had it replaced but light still came on with same code. Left mechanic to run errands and the car would not acelerate. Was runnig but would not acelerate in reverse and drive. It finally died. After replacing battery for and a second experience, was told the alternator was bad. Replaced Alternator. Check engine light still on!! Nissan dealership said nothing about the light and diagonstic did not show anything else wrong. Went back, and they said the Mass Air Flow Sensor needed to be replaced. Did that and now my car reads only 18.5 miles a gallon instead of usual 22.3. Oh Yeah, light still on with original code. Still can't pass smog! What to do What to do

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I have a 2006 nissan maxima 6 spd. when i purchased it there was 89,500. i replaced the clutch disk, release bearing, pressure plate and added a brand new flywheel(from the nissan dealer). a few days afterwards, the check engine light came on with a P2A00 and a P0420. when replacing the clutch kit i had to remove the exhaust system. i thought that i did not correctly install the exhaust system. after many inspections, i did do a good job installing the exhaust system. at this point i replaced the upstream, bank one oxygen sensor(a pain in the rear). i pray for God to lead me to the problem. don't try this at home but i jacked the front of my car up and rested it on jack stands and chock the rear tire. i started the engine and got under the car under the engine. i heard an exhaust leak at the bottom of the bank one, rear catalytic converter. one that catalytic converter, it has a small heat shield tack welded at the bottom. after taking that heat shield off, i found that the two tack welds at the top of that heat shield had broken causing an exhaust leak. THANK THE LORD! after plugging those holes and drive my car normally for the next two days, the check engine light when off. problem solved!

Posted on Oct 16, 2011


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