P0428

DTC P0428, sometimes indicated as P042800 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the auxiliary emissions system causing catalyst temperature sensor high (bank 1, sensor 1).

The code means that the catalytic converter on Bank 1, Sensor 1 is getting too hot. This can be caused by a number of things, including a problem with the catalytic converter itself, a problem with the exhaust system upstream of the converter, or a problem with the engine control system.
The most common solution is to replace the catalytic converter. However, if the problem is with the engine control system, that will need to be fixed as well.

• P0428: Catalyst Temperature Sensor High (Bank 1, Sensor 1)
• P0428: Catalyst Temperature Sensor Circuit High Bank 1 Sensor 1
• P0428: Catalyst Temp. Sensor Circuit High (Bank 1 Sensor 1)
• P0428: Catalytic converter temperature sensor, bank 1 – high input
• P0428 00: Catalytic converter temperature sensor, bank 1 - high input