DTC P0134 (2017 2018 2019): General Description
The rear air/fuel ratio (A/F) sensor (bank 1, sensor 1) is activated by warming the element with a heater and by maintaining a steady high temperature to accurately calculate the air/fuel ratio. If the heater does not properly heat the element, the rear A/F sensor (bank 1, sensor 1) does not activate, and the exhaust emissions deteriorate. The powertrain control module (PCM) monitors the rear A/F sensor (bank 1, sensor 1) internal resistance.
- When the rear A/F sensor (bank 1, sensor 1) does not activate for a set time after the rear A/F sensor (bank 1, sensor 1) heater is turned on (with high rear A/F sensor (bank 1, sensor 1) internal resistance), a malfunction of the rear A/F sensor (bank 1, sensor 1) heater is detected, and a DTC is stored.
- When the rear A/F sensor (bank 1, sensor 1) heater cycles ON and OFF for a set time, and the resistance remains high when the heater is ON, a malfunction of the rear A/F sensor (bank 1, sensor 1) heater is detected, and a DTC is stored.