trouble code p0420
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Joined: Apr 2003
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trouble code p0420
some vechiles may have there mil on with code 420 stored in continuous memory with no driveability concerns.this may be caused by the calibration of the power control module.if no other failures are observed during normal diagnosis[ damaged catalyst,stuck fuel injectors,etc]reprogram the pcm with the latest level calibration in the application chart.pcm reprogramming should be performed before any emission hardware is replaced.if vechile already has the latest calibration,follow normal diagnostic procedures for trouble codes.warranty status-under the bumper-bumper coverage basic part no. condition code42
