P0437

DTC P0437, sometimes indicated as P043700 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 circuit low (bank 2, sensor 1).

The most common cause of this code is a bad or contaminated catalytic converter. A bad or contaminated converter will cause the sensor to read a low temperature, which will trigger the code.
If the code is caused by a bad converter, the only solution is to replace the converter. If the code is caused by contamination, the converter may be cleaned, but it is likely that the entire converter will need to be replaced.

• P0437: Catalyst Temperature Sensor Circuit Low (Bank 2, Sensor 1)
• P0437: Catalyst Temperature Sensor Circuit Low Bank 2 Sensor 1
• P0437: Catalyst Temp. Sensor Circuit Low (Bank 2 Sensor 1)
• P0437: Catalytic converter temperature sensor, bank 2 – low input
• P0437 00: Catalytic converter temperature sensor, bank 2 - low input