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Marc, Technician, Auto, Diesel
Category: Ford
Satisfied Customers: 1888
Experience:  32 years exp. Automotive repairs on Ford cars and trucks
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What does GENERIC OBD II Code 430 mean

Customer Question

Ford Crown Vic police Interceptor
Submitted: 11 years ago.
Category: Ford
Expert:  Marc replied 11 years ago.

P0430 Catalyst System Efficiency Bank 2 Below Threshold

Possible Causes

  • Air leaks at the exhaust manifold or in the exhaust pipes
  • Catalytic converter is damaged, contaminated or has failed
  • Engine cylinders misfiring, or the ignition timing is retarded
  • Engine oil may be contaminated
  • Front HO2S or rear HO2S is contaminated with fuel or moisture
  • Front HO2S and/or the rear HO2S is loose in the mounting hole
  • Front HO2S older (aged) than the rear HO2S (HO2S-11 is lazy)
  • Fuel system pressure is too high (check the pressure regulator)
  • HO2S wires improperly connected