P0435 Code - Catalyst Temperature Sensor Circuit Bank 2 Sensor 1

What Does P0435 Mean?

In order to determine proper exhaust composition and temperature, the Powertrain Control Module (PCM) analyzes data sent from the oxygen sensors, using the data to calculate catalyst efficiency. If the signal sent to the PCM by the oxygen sensors falls outside of the expected parameters, the code will set.

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What are the common causes of P0435 ?

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 P0435 ?

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.



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