Question about 2001 Nissan Altima
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Posted on Jan 02, 2017
yes, thats the typical symptom of a IAC valve giving you trouble, try cleaning it up but ull probabbly will have to replace it
hope this helps
Posted on Nov 11, 2009
also check the cat by removing the o2 sensor befor the cat and look in the hole. if there is any deformity to the cat ( melted, holes, missing) replace it right away the nature of the 2.5l it sucks the cat matirial back into the motor damaging the rings and bearings. the most comon cause of cat failure on that modle is head gasket failure so before sinking 750$ in a cat have the head gasket checked.
Posted on Mar 29, 2010
SOURCE: check engine light on
Diagnostic code produces P0420 catalyst system efficiency below threshold-Bank 1. Probable causes are listed as follows:
1-air leak in exhaust before rear 02 sensor, 3-Fuel system fault,
4-faulty catalytic converter.
Posted on May 31, 2010
HI. This is a sign of a catalytic converter that is not working as efficiently as it should be. It is part of the vehicle emissions system. The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream O2 sensor waveform readings should fluctuate, but the downstream O2 sensor reading should be fairly steady. If the PCM detects that the two O2 sensors are reading in a similar manner, the DTC code P0420 will be issued. The necessary action are to check for any exhaust leaks at the manifold, pipes and catalytic converter. You will also need to check the spark timing to insure that it is normal and inspect the coolant temp sensor for its integrity. If all the check points test out ok, the remaining actions will be to replace your catalytic converter. A lot of the emission parts are covered under the warranty package if the vehicle is not out of its warranty contract. If you still have full warranty coverage at this time, this repair should be covered. I would check that out before purchasing any parts.
Posted on Aug 24, 2010
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