DTC P0134: General Description

Courtesy of HONDA, U.S.A., INC.

The air fuel ratio (A/F) sensor (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 A/F sensor (sensor 1) does not activate, and the exhaust emissions deteriorate. The powertrain control module (PCM) monitors the A/F sensor (sensor 1) internal resistance.

• When the A/F sensor (sensor 1) does not activate for a set time after the A/F sensor (sensor 1) heater is turned on (with high A/F sensor (sensor 1) internal resistance), a malfunction of the A/F sensor (sensor 1) heater is detected, and a DTC is stored.
• When the A/F sensor (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 A/F sensor (sensor 1) heater is detected, and a DTC is stored.