Question about 2005 Nissan Altima

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I have a P0420 code on a nissan help me fix it

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Catalytic converter efficiency below threshold bank 1 possible problems are engine coolant temp sensor or o2 sensor not reading properly or front and behind catalytic o2 sensors read similar-- ****** spark timing--damaged or leaking /exhaust manifold/catalytic conv/exhaust pipe. check for leaks or damage to exhaust repair or replace as necessary

Posted on Nov 15, 2009

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Posted on Jan 02, 2017

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