P0433 Code - Heated Catalyst Efficiency Below Threshold Bank 2

What Does P0433 Mean?

The Catalytic Converter takes the exhaust gases left over by the combustion process and converts those gases to harmless emissions. The engine control module (PCM) compares the front and rear oxygen sensors to each other to determine catalytic converter efficiency. If the input from the rear oxygen sensor starts to match the front oxygen sensor, the PCM will set code P0433.Catalytic converters are covered under federally mandated 8yr/80,000 mile warranty by the vehicle's manufacturer. Catalytic converters usually fail as a result of something else (engine misfire, internal oil leak, or internal coolant leak) not being repaired. The original cause of the failure is usually not covered under warranty.

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What are the common causes of P0433 ?

The most common cause of this code is due to a faulty catalytic converter. Bad oxygen sensors are also a possibility but if this is the case an oxygen sensor code will usually accompany the catalytic converter code. Always diagnose and repair oxygen sensor codes before attempting to diagnose catalytic converter codes. Since the catalytic converter is not designed to wear out, its failure is normally associated with some contributing malfunction. Contributing factors in catalytic converter failure may include incorrect fuel usage, excessive fuel being dumped into the exhaust system due to a faulty coolant temperature sensor, mass air flow sensor, manifold air pressure sensor, fuel pressure regulator, or fuel injection component, an ignition misfire, retarded spark timing, or oil contamination. Leaks from an exhaust manifold, down pipe, flex hose, or other exhaust component that is upstream from the catalytic converter can also appear to the PCM as catalytic converter failure.

How do you troubleshoot P0433 ?

Deactivation of cylinders is achieved by releasing a synchroniser pin that normally interlocks the cam follower and rocker arms. P0433 code resolves the synchroniser pin is released using hydraulic pressure which is controlled by a dedicated solenoid.



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