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Code p0420 2008 nissan altima - Cars & Trucks

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P0420: Catalyst Efficiency Below threshold. means catalytic converter is not performing to standards may need to replace cat. not sure if those guys that soak theirs even works in the long run. be sure to have any other engine running problems fixed before replacing cat to prolong its life.

Posted on Nov 04, 2012

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SOURCE: 1993 nissan altima code 21 ignition signal - how to fix/repair

Replace the O2 Sensor, reset the ECU, and subject solve.

Good luck.

Posted on Jul 19, 2010

  • 3600 Answers

SOURCE: What does trouble code 12 mean on nissan altima

a code 12 means no G or Ne signal to the ecu im put side for at least 2 seconds that code is ground (G) so it is an open or short to ground on the ECU threw the STA circuit

Posted on Jun 28, 2009

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