P0428 OBD II Trouble Code Catalyst Temperature Sensor Circuit High (Bank 1, Sensor 1)

How to diagnose, repair, and info on causes of a P0428 engine code which involves the bank 1 sensor 1 catalyst temperature oxygen sensor circuit which is high. Also includes links to relevant forum topics on the code.

Symptoms of P0428 OBD II Trouble Code

Common Causes of P0428 OBD II Trouble Code

Severity of P0428 OBD II Trouble Code

Never miss out: Get notified about P0428.