Question about Nissan Altima

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My car 98 nissan altima was turn off and apaired the code p0420

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Un-hook one cable from your battery and leave it off for at least 20 minutes then hook it back up. That re-boots the computer. If the light comes back on then you have an actual problem not just a spurious code set. Take it to Advance Auto parts and they will read out the computer error codes for you and that will tell you what the computer thinks the problem is. Of course you may have to re-set your radio stations.

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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2001 Altima 2.4 will not start after intake gasket replaced scanner says it has 1 fault 14 initial start


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2005 Nissan Altima service engine light came on, Had a reading = P0420, #1 aa1 Large vacumm leak, #2 aa2 Fuel system fault, #3 aa3 Ignition system fault and #4 aa4 Failed Bank 1 catalytic converter. Any...


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What are codes P0720, p1574, p0420? 2002 Nissan Altima


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2002 Nissan Altima P0720, P1574, P0420


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What is an code po300 and po420 and what do i need to do i have an 2002 nissan altima


The p0300 code is a random missfire code sometimes caused by bad spark plugs and wires, if you have not done a tune up, it's time for one. now, the p0420 code is for catalyst efficiency below threshold, basically, your catalytic converter is bad and may need to be replaced. Sometimes repairing the random missfire can eventually clear the p0420 code. your car is not burning fuel properly, therefore the catalytic converter is getting dirty. Also, if you notice blue smoke coming out the tail pipe, then that's the cause for a failing catalytic converter as oil is getting to the combustion chamber and being burned off through the exhaust.

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3 Answers

Receiving engine code p0420 on my 2005 altima 2.5 s


A p0420 code indicates a Catalytic System efficiency failure, Bank 1.
Basically, the computer is seeing reduced efficiency of the catalytic converter or one of it's components (such as an 02 sensor)

There may be a few root causes, such as a faulty oxygen sensor, faulty coolant temperature sensor, faulty converter, Large exhaust leak, or retarded (slow) timing.

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