P0141: Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)

Understanding P0141

The P0141 error code stands for "Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)." This code indicates that the heater circuit in the downstream oxygen sensor (after the catalytic converter) on Bank 1 is not functioning properly. The heater circuit helps the oxygen sensor reach operating temperature quickly to deliver accurate data for fuel and emissions control.

Importance of addressing P0141

Addressing the P0141 code is important because a malfunctioning oxygen sensor heater can affect fuel efficiency and emissions output. When the sensor heater is not working, it may take longer for the oxygen sensor to warm up, delaying accurate oxygen level readings for the engine control module. This can lead to improper fuel-air mixture adjustments, hurting performance and fuel economy and potentially causing increased emissions.

Can I safely drive my car with this error code?

Yes, you can drive your car with the P0141 code without an immediate risk of severe engine damage. However, prolonged driving with this issue may lead to poor fuel economy, elevated emissions, and potentially a failed emissions test. It is best to address the issue quickly to maintain fuel efficiency and environmental standards.

Common symptoms of P0141

• Check engine light is illuminated
• Decreased fuel efficiency
• Failed emissions test
• Engine may take longer to reach normal operating efficiency

Diagnosing P0141

Diagnosing the P0141 error code involves the following steps:

• OBD-II scanner: A technician uses an OBD-II scanner to confirm the P0141 code and check for any additional codes.
• Visual inspection: The downstream oxygen sensor and associated wiring are inspected for signs of damage, corrosion or disconnection.
• Sensor heater circuit testing: The heater circuit’s resistance is measured with a multimeter to ensure it is within specifications.
• Voltage testing: The voltage supply to the heater circuit is checked to verify that the engine control module is delivering power properly.
• Evaluate ECM output: In rare cases, if the oxygen sensor and wiring are in good condition, the engine control module's ability to control the heater circuit may be assessed.

Repairing P0141

Repairing the P0141 code typically involves:

• Replace the oxygen sensor: If the heater circuit in the sensor is faulty, replacing the sensor is often the most effective solution.
• Repair wiring issues: Damaged or corroded wires and connectors should be repaired or replaced as needed.
• Check and replace fuses: Blown fuses associated with the oxygen sensor circuit should be replaced.
• Clear code and test: Once repairs are completed, the P0141 code should be cleared with an OBD-II scanner, followed by a test drive to confirm the repair was successful.

Related reading

Follow the link below to reach our diagnostic check engine trouble codes catalog:
On-board diagnostics (OBD-II) trouble code directory