P0061 Fault Code

P0061 OBD-II Trouble Code Short Description

HO2S Heater Resistance (Bank 2, Sensor 3)

What does trouble code P0061 mean?

P0061 is a diagnostic trouble code (DTC) related to the heater resistance of the oxygen sensor (HO2S) in bank 2, sensor 3. Bank 2 refers to the side of the engine that does not contain cylinder 1, and sensor 3 indicates the third oxygen sensor downstream from the engine.

The primary function of the HO2S is to measure the oxygen level in the exhaust gases and provide feedback to the engine control module (ECM). The ECM uses this information to adjust the air-fuel mixture for optimal combustion and reduce emissions.

When the ECM detects a high resistance in the heater circuit of the HO2S in bank 2, sensor 3, it triggers the P0061 fault code. This high resistance indicates an issue with the heater element inside the oxygen sensor, preventing it from reaching and maintaining the required operating temperature.

The most common causes of P0061 include a faulty oxygen sensor, a damaged or open heater circuit, or a problem with the ECM. It's important to note that the specific location of the sensor can vary depending on the vehicle's make and model.

To diagnose and repair the P0061 code, the following steps are typically taken:

  1. Inspection: The mechanic visually inspects the wiring and connector associated with the bank 2, sensor 3 oxygen sensor for any signs of damage, corrosion, or loose connections. They may also check for any exhaust leaks that could affect the sensor's performance.

  2. Testing the oxygen sensor: The oxygen sensor's heater circuit resistance is measured using a digital multimeter. If the resistance is outside the specified range, the sensor is considered faulty and should be replaced.

  3. Checking the heater circuit: The mechanic tests the heater circuit wiring and component resistance to ensure there are no open circuits. If an open circuit is detected, the damaged components will need to be repaired or replaced.

  4. ECM inspection: In some cases, the ECM itself may be causing the issue. If all other components check out, the ECM may need to be inspected and potentially reprogrammed or replaced.

Overall, resolving the P0061 fault code involves identifying the specific cause of the HO2S heater resistance issue and addressing it accordingly. It is recommended to consult a qualified mechanic or technician to accurately diagnose and fix the problem.


What are the symptoms of the P0061 code?

The P0061 fault code typically indicates a problem with the HO2S (Heated Oxygen Sensor) Heater Resistance in Bank 2, Sensor 3. Here are some common symptoms associated with this fault code:

  • Check Engine Light (CEL) or Malfunction Indicator Lamp (MIL) illumination
  • Rough or unstable idle
  • Decreased fuel efficiency
  • Engine misfires or poor acceleration
  • Increased exhaust emissions
  • Possible fuel odor

If you experience any of these symptoms, it is recommended to have your vehicle diagnosed and repaired by a qualified mechanic to address the issue related to the P0061 fault code.


What causes the P0061 code?

The P0061 fault code refers to the HO2S (Heated Oxygen Sensor) heater resistance on Bank 2, Sensor 3. This code is typically seen in vehicles with multiple oxygen sensors.

Potential causes of the P0061 fault code include:

  1. Faulty oxygen sensor: The HO2S sensor may be malfunctioning, causing incorrect readings or resistance.
  2. Wiring issues: There may be a problem with the wiring connecting the sensor to the vehicle's electrical system.
  3. Faulty PCM (Powertrain Control Module): The PCM may be malfunctioning and not properly controlling the sensor's heater circuit.
  4. Poor electrical connection: There may be a loose or corroded connection between the sensor and the vehicle's electrical system.
  5. Exhaust system leak: A leak in the exhaust system near the oxygen sensor can cause false readings, triggering the fault code.

To diagnose and repair the P0061 fault code, it is recommended to:

  1. Inspect the wiring and connections: Check for any damages, loose connections, or corrosion in the wiring and connections related to the sensor.
  2. Test the oxygen sensor: Use a multimeter to measure the resistance of the sensor's heater circuit. Compare the readings to the manufacturer's specifications.
  3. Test the PCM: Diagnose the vehicle's PCM to ensure it is properly functioning and controlling the sensor's heater circuit.
  4. Inspect the exhaust system: Check for any leaks or damages in the exhaust system near the oxygen sensor.

It is advisable to consult with a professional mechanic or refer to the vehicle's service manual for specific diagnostic and repair procedures for your car model.

Possible Solutions

How to fix P0061?

To fix the P0061 fault code on cars, follow these steps:

  1. Confirm the fault: Use an OBD-II scanner to read and confirm the P0061 fault code. Ensure that it specifically relates to the HO2S (Heated Oxygen Sensor) Bank 2, Sensor 3.

  2. Inspect wiring and connectors: Check the wiring harness and connectors associated with the HO2S Bank 2, Sensor 3. Look for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.

  3. Test the sensor: Use a multimeter to check the resistance of the HO2S Bank 2, Sensor 3 heater circuit. Compare the readings to the manufacturer's specifications. If the resistance is out of range, replace the sensor.

  4. Replace the HO2S sensor: If the sensor itself is found to be faulty, it may need to be replaced. Consult the vehicle's service manual or manufacturer's recommendations for the correct sensor to use.

  5. Clear the fault code: After making any repairs or replacements, clear the fault code using the OBD-II scanner. This will reset the vehicle's onboard computer system.

  6. Test drive the vehicle: Take the car for a test drive to ensure that the fault code does not reappear. Monitor the OBD-II scanner for any new fault codes that may arise during the drive.

If the fault code persists after following these steps, it is recommended to seek professional assistance from a qualified mechanic or technician to diagnose and resolve the issue.