P0427

DTC P0427, sometimes indicated as P042700 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 low (bank 1, sensor 1).

The catalytic converter temperature sensor measures the temperature of the converter. The PCM uses this information to determine the best time to activate the converter. If the PCM detects that the converter is not reaching the required temperature, it will set the P0427 code.
There are several possible causes for this code. The most common are a defective sensor, a restricted exhaust, or a misadjusted fuel mixture.
If the code is caused by a defective sensor, the sensor will need to be replaced. If the code is caused by a restricted exhaust, the exhaust will need to be cleared. If the code is caused by a misadjusted fuel mixture, the fuel mixture will need to be adjusted.

• P0427: Catalyst Temperature Sensor Low (Bank 1, Sensor 1)
• P0427: Catalyst Temperature Sensor Circuit Low Bank 1 Sensor 1
• P0427: Catalyst Temp. Sensor Circuit Low (Bank 1 Sensor 1)
• P0427: Catalytic converter temperature sensor, bank 1 – low input
• P0427 00: Catalytic converter temperature sensor, bank 1 - low input