P0428 Code - Catalyst Temperature Sensor High Input Bank 1 Sensor 1

What Does P0428 Mean?

The Engine Control Module (ECM) monitors the Catalyst Temperature Sensor Circuit Performance, which measures the temperature of the catalyst. Catalyst Temperature Sensor function by increasing their resistance with increasing exhaust gas temperature. The ECM sets the OBDII code when the Catalyst Temperature Sensor signal is not to factory specifications.

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What are the common causes of P0428 ?

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 P0428 ?

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.



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