P042A – Catalyst Temperature Sensor Circuit Bank 1 Sensor 2

P042A Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P042A Possible Causes

Faulty Catalyst Temperature Sensor,Catalyst Temperature Sensor harness is open or shorted,Catalyst Temperature Sensor circuit poor electrical connection

P042A Description

The Engine Control Module (ECM) monitors the Catalyst Temperature Sensor Circuit Performance, which measures the temperature of the catalyst. Catalyst Temperature Sensor function by increasing their resistance with increasing exhaust gas temperature. The ECM sets the OBDII code when the Catalyst Temperature Sensor signal is not to factory specifications.