Question about Nissan Xterra

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Engine light came on checked problem and got code P0420 / P0325 with the message, Catalyst Efficiency Below Threshold (Bank 1) Knock sensor 1 CKT Malfunktion. The only symptoms are running a little rough at idle and seems to be using a lot of gas (a little over 10mi/gallon). It Fail smog check . any information you could offer would be appreciated. Thank you!!!

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Hi,

p0420 is ur bank 2 o2 sensor that mean is the 02 sensor either on the cat or on the engine pipe and knock sensor for the car is always go bad.

You will need to replace the knock sensor unless you find something like a bad wiring problem going to it.

The P0420 could be a couple of things. The greatest mayority of the problems comes from the catalytic converter or O2 sensors. There are rare ocassions where it could also be coming from an intake or exhaust leak, or even an ignition problem.

Looks like ebay is the place to buy those for around $60

Thanks for contacting Fixya

Posted on Jun 24, 2009

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I've had a trouble code( P0420) code come up,


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1996 taurus p420 code


The P0420 means Catalyst System Efficiency Below Threshold (Bank 1), and the P0430 means Catalyst System Efficiency Below Threshold (Bank 2).
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ECU unlock immobilizer tool

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Hi and welcome to FixYa!

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