P0438
Catalyst Temperature Sensor High Input Bank 2 Sensor 1
Generic code
Auxiliary Emissions Control
Medium severity
Moderate repair
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What P0438 means
- The fault code P0438 indicates that there is an issue with the Catalyst Temperature Sensor Circuit on Bank 2. This means that the temperature of the catalytic converter is higher than expected, possibly indicating a failure of the converter or a malfunction in the sensor readings.
Possible symptoms
- Illuminated check engine light
- Reduced fuel efficiency
- Decreased engine performance
- Rotten egg smell from exhaust
- Overheating of the catalytic converter
Possible causes
- Failed catalytic converter
- Faulty wiring or connections in the sensor circuit
- Corroded or damaged sensor connector
- Failed temperature sensor
- Malfunctioning engine control module (ECM)
Related parts
- Catalyst Temperature Sensor: A catalyst is a chemical substance that takes the exhaust gas stream from the engine and converts toxic gases and pollutants to less harmful pollutants. The function of the catalyst temperature sensor is to warn the car computer if temperature of the catalyst goes above the safe limit. Problems lead to harmful emissions out of limit
Possible solutions
- Replace the catalytic converter
- Check and repair any damaged or corroded wiring or connections in the sensor circuit
- Replace the sensor connector if necessary
- Replace the temperature sensor
- Replace the engine control module (ECM) if necessary
Free on OBD DashX
P0438 on OBD DashX
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