P0437: Catalyst Temperature Sensor Circuit Low Bank 2 Sensor 1
What to do
Usually driveable with no symptom beyond the warning light.
What this code means
The bank 2 catalyst temperature sensor signal has fallen below its plausible range — the counterpart of P0427. Unplugging the sensor and watching which way the reported value moves identifies how this circuit behaves with an open, which tells you what you are looking at.
Likely causes
Start here
- Faulty catalyst temperature sensor · moderate
- Signal wire shorted to ground · moderate
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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