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Forums Nissan Models Altima 2000 Altima P0325 P0420 Knock sensor
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Old 07-19-2009, 08:28 AM
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Default 2000 Altima P0325 P0420 Knock sensor

I've pulled P0325 (knock sensor) and P0420 (catalytic converter) on an inspection test and don't know the best to fix without just replacing things randomly. The knock sensor is next to the oil filter and looks very accessible from the bottom but most suggestions online say to pull off the intake manifold from the top, a much longer job.

Can the knock sensor be replaced from the bottom (or are the illustrations just illusionary)?

Any ideas what the two codes mean together or any suggestions on how to diagnose?

The inspection guy recommended to clear up the EGR first just in case since it's easy.

Also it had the same condition last year for a few months and then then it went away by itself. It's been a few months now this year and it's still on...

Thanks.
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Old 10-23-2010, 07:44 PM
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Does anybody have something to say about this? I have the same trouble. HELP!
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Old 11-17-2010, 07:10 PM
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I know very little about cars but am learning more than I wanted to trying to get my 96 started. From talking to parts dealers and mechanics, most seem to feel that the knock sensor is a waste of time and money (what I heard - not what I know directly). Also heard it is difficult to get to (from top) and may fry soon after it is replaced. A Nissan mechanic would be the best source to verify if this is true. My knock sensor has been bad for at least a year. No one who has heard this is concerned. Emissions testing facilities will tell you the code is present but in IL this will not cause an emissions test failure. It won't turn on the check engine light.

The p0420 code will cause an emissions test failure. The EC document posted in the documents link for the 1996 Altima indicates the following can cause the error: three way catalyst, exhaust tube, intake air leak, injectors, and injector leak. There is a procedure listed to check the three way catalyst. A more detailed discussion is here: http://repairpal.com/OBD-II-Code-P0420 If you don't have diagnostic equipment, it sounds like the easiest and quickest test would be to change out your front oxygen sensor.

Last edited by crabby1; 11-19-2010 at 08:13 PM.
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