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Trust Walker, an industry leader, for the finest emission control technologies for import and domestic vehicles.
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Walker offers complete coverage: direct-fit mufflers, converters, pipes, resonators and accessories.
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WALKER® EXHAUST SYSTEMS: Correct Other Engine Codes
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WALKER® EXHAUST SYSTEMS: Correct Other Engine Codes
Any condition that increases emissions or affects sensor readings could cause a converter to fail diagnostics even if the converter is good.
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  • Many OBDII trouble codes will affect converter performance. Correct all other codes prior to correcting converter codes.
  • The following codes are related to the catalytic converter:
    • P0420 Catalyst system efficiency below
      threshold (Bank 1)
    • P0421 Warm-up catalyst efficiency below
      threshold (Bank 1)
    • P0422 Main catalyst efficiency below
      threshold (Bank 1)
    • P0423 Heated catalyst efficiency below
      threshold (Bank 1)
    • P0424 Heated catalyst temperature below
      threshold (Bank 1)
    • P0430 Catalyst system efficiency below
      threshold (Bank 2)
    • P0431 Warm-up catalyst efficiency below
      threshold (Bank 2)
    • P0432 Main catalyst efficiency below
      threshold (Bank 2)
    • P0433 Heated catalyst efficiency below
      threshold (Bank 2)
    • P0434 Heated catalyst temperature below
      threshold (Bank 2)
WALKER® EXHAUST SYSTEMS: Correct Other Engine Codes