P0141 Fault Code

O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0141 fault code indicates a malfunction in the oxygen sensor heater circuit for Bank 2 Sensor 2. This sensor is crucial for monitoring the oxygen levels in the exhaust gases, which helps the engine control unit (ECU) make adjustments to the air-fuel mixture for optimal combustion.

• A properly functioning O2 sensor heater is important for reducing emissions and ensuring the engine runs efficiently.
• When this circuit malfunctions, it can lead to poor fuel economy and increased emissions.

What are the symptoms of the P0141 code?

Common symptoms associated with a P0141 code may include:

• The check engine light illuminating on the dashboard.
• Decreased fuel efficiency as the engine struggles to maintain the correct air-fuel mixture.
• Rough idling or stalling in some cases as the sensor feedback is compromised.
• Emission testing failure due to the malfunctioning sensor.

What causes the P0141 code?

There are several potential causes for a P0141 fault code, including:

• A faulty oxygen sensor heater.
• Wiring issues, such as frayed or shorted wires in the heater circuit.
• A blown fuse that powers the O2 sensor heater.
• Poor connections at the sensor or ECU leading to intermittent faults.

How to fix P0141?

To resolve a P0141 fault code, the following steps can be taken:

• Start by visually inspecting the wiring and connections to Bank 2 Sensor 2 for any signs of damage or corrosion.
• Test the oxygen sensor heater with a multimeter to ensure it is within the manufacturer's specified resistance range.
• Replace the O2 sensor if it is found to be defective.
• If the wiring is damaged, repair or replace the affected harness.
• Finally, clear the codes and perform a road test to ensure the issue is resolved.