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Old 04-11-2005, 12:28 PM   #4
lewisnc100
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Re: 01 Pathfinder P420 P430 SES code

Clearing the codes does not buy you anything, any codes will clear themselves after 3 drive cycles are completed with no malfunction. You've had the P0420/P0430 error codes for a year so they are obviously a problem.

Other things to check for these errors:

- Visually check the exhaust tubes and muffler for dents
- With the engine idling listen for an exhaust leak before the catalytic converter
- With the engine idling listen for an intake air leak after the MAF
- Injectors or injector leak
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