DTC P0135: O2 Sensor Heater Circuit Malfunction (bank 1 sensor 1)

CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal 1) to the right bank heated oxygen sensor (front) heater.
• The PCM (terminal 4) controls continuity to the right bank heated oxygen sensor (front) heater by turning the power transistor in the PCM "ON" and "OFF."
TECHNICAL DESCRIPTION
• The PCM checks whether the heater current is within a specified range when the heater is energized.
DTC SET CONDITIONS

Check Conditions
Engine coolant temperature is higher than 20°C (68°F).
While the right bank heated oxygen sensor (front) heater is on.
Battery positive voltage is at between 11 and 16 volts.

Judgment Criteria
• Heater current of the right bank heated oxygen sensor (front) heater has continued to be lower than 0.2 ampere or higher than 3.5 ampere for 6 seconds.
• One monitor during one drive cycle.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
• Open or shorted right bank heated oxygen sensor (front) heater circuit.
• Open circuit in right bank heated oxygen sensor (front) heater.
• PCM failed.