P1135 Air Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

OBD2 Code: P1135

Description: Air Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Definition: This code indicates that there is a problem with the heater circuit in the air-fuel ratio sensor located on bank 1, sensor 1. The heater helps bring the sensor to its operating temperature quickly for accurate readings.

p1135 – Air Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Typical Severity: Severe

Common Causes

p1135 – Air Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Common causes:

• Faulty air fuel ratio sensor
• Open or short in the heater circuit wiring
• Poor electrical connection in the sensor circuit
• Blown fuse related to the sensor heater circuit

 

Common Misdiagnosis

OBD2 Code: P1135

Description: Air Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

Common Misdiagnosis: Replacing the air-fuel ratio sensor without checking for issues in the wiring or connectors that could be causing the malfunction. Often, the problem lies in a blown fuse or damaged wiring rather than the sensor itself.

 

Common Diagnostic Steps

OBD2 Code: P1135

Description: Air Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

• Check for any additional trouble codes that may be present.
• Inspect the air fuel ratio sensor and its wiring for damage or disconnection.
• Test the resistance of the heater circuit in the air fuel ratio sensor using a multimeter.
• Verify power supply and ground to the sensor’s heater circuit.
• Check for blown fuses related to the oxygen sensor circuits.
• Use an OBD2 scanner to monitor live data and confirm if the sensor is functioning properly.
• If necessary, replace the faulty air fuel ratio sensor with a new one.
• Clear all codes and test drive to ensure no codes return.