P0425
PowertrainCatalystmoderate severityCatalyst Temperature Sensor (Bank 1, Sensor 1)
What P0425 Means
The PCM detected a fault with the bank 1 catalyst temperature sensor circuit. This sensor monitors converter temperature for emissions control.
Symptoms
- Check engine light on
- Failed emissions test
- Inaccurate temperature readings
Common Causes
- Faulty catalyst temperature sensor
- Open or shorted wiring
- Corroded connector
- Faulty PCM input
Diagnostic Steps
- Scan and confirm P0425
- Inspect sensor wiring
- Measure sensor signal
- Compare to expected values
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Community Confirmed Fixes
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