Powertrain
generic / SAE
P0438
Catalyst Temperature Sensor Circuit High (Bank 2 Sensor 1)
Catalyst temperature sensor at bank 2 sensor 1 above upper plausibility — open signal or short to B+.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 38
Possible causes
- Open signal line high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source low
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Inspection / repair
- Difficulty: medium
- DIY: possible
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References
sae:J2012