Faulty catalyst temperature sensor on bank 2; Damaged or corroded wiring or connector at the sensor; Open or short circuit in the sensor signal or ground circuit; Exhaust leaks near the sensor altering temperature readings; Failed catalytic converter causing abnormal temperature; Poor electrical connection at the powertrain control module

DTC codes / P04xx · Auxiliary emission controls / P0435

P0435Catalyst Temperature Sensor (Bank 2)

Q: What does code P0435 mean?

Catalyst Temperature Sensor (Bank 2). P0435 indicates that the powertrain control module has detected an out-of-range signal from the catalyst temperature sensor for bank 2, which is the side of the engine that does not contain cylinder number one. The computer compares the sensor's voltage or resistance to expected values and flags the circuit as faulty when the reading falls outside the normal operating window.

P0435 indicates that the powertrain control module has detected an out-of-range signal from the catalyst temperature sensor for bank 2, which is the side of the engine that does not contain cylinder number one. The computer compares the sensor's voltage or resistance to expected values and flags the circuit as faulty when the reading falls outside the normal operating window.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Slightly reduced fuel economy as the computer may default to a richer fuel mixture
A faint sulfur or rotten egg smell from the exhaust if the catalyst overheats
In rare cases, a rough idle or hesitation during acceleration
Failure to pass an emissions inspection due to the stored code

Common causes, most likely first

Faulty catalyst temperature sensor on bank 2
Damaged or corroded wiring or connector at the sensor
Open or short circuit in the sensor signal or ground circuit
Exhaust leaks near the sensor altering temperature readings
Failed catalytic converter causing abnormal temperature
Poor electrical connection at the powertrain control module

How to diagnose and fix it

Use an OBD-II scanner to verify P0435 and check for related codes
Visually inspect the bank 2 catalyst temperature sensor and its wiring for damage or corrosion
Measure the sensor's resistance and compare to the manufacturer's specification
Check for exhaust leaks around the sensor and catalytic converter
Test the sensor signal circuit for continuity and shorts to ground or power
Replace the catalyst temperature sensor if faulty and clear the code
If the code returns, diagnose the catalytic converter and PCM circuits

What a catalyst temperature sensor code really means

A P0435 is often set by a simple wiring issue rather than a failed sensor, so always inspect the harness before replacing parts.
The bank 2 catalyst temperature sensor monitors the efficiency of the catalytic converter, but a code does not always mean the converter is bad.
Exhaust leaks upstream of the sensor can cause false temperature readings and trigger this code without any sensor fault.
On some vehicles, a weak battery or charging system can cause voltage spikes that mimic a sensor failure.
Clearing the code without repairing the root cause will usually result in the code returning after a few drive cycles.

Can I keep driving with P0435?

You can generally continue driving with P0435, but avoid heavy acceleration and long trips until it is diagnosed, because a faulty sensor can lead to increased emissions and reduced fuel economy. If the check engine light starts flashing or you notice performance issues, stop driving and seek professional help.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.