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I've read some forums and it looks like it might be when the engine goes into "safe mode" and won't let you rev over 2500 RPM. I have a 2002 Nissan Altima that started having this problem that would not allow me to rev past 2500 RPM's and it got worse. I tore the engine down after the dealer informed me that the pre-cat was coming apart and was going to suck particles back into the motor and destroy it. People this is a bunch of crap.......The truth is the pre-cat is coming apart and everything in the pre-cat will be stuck in the second cat causing the engine to overheat because the exhaust gases cannot get out and the engine will not rev due to the fact that it cannot breathe.

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Q: How can you tell when 2002 Altima Mass Air Flow MAF sensor is bad or going bad?
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