P2239 Fault Code

O2 Sensor Positive Current Control Circuit High Bank 1 Sensor 1

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

• The P2239 fault code indicates an issue with the oxygen sensor's positive current control circuit for Bank 1 Sensor 1.
• This sensor is responsible for monitoring the level of oxygen in the exhaust gases. Its readings are crucial for the engine control unit (ECU) to adjust the air-fuel mixture for optimal combustion.
• A problem in the circuit could lead to incorrect readings, impacting fuel efficiency and emissions.

What are the symptoms of the P2239 code?

• Symptoms that may accompany the P2239 code include:
  • Check Engine Light illuminated on the dashboard.
  • Decreased fuel efficiency, leading to more frequent trips to the gas station.
  • Potential rough idling or poor engine performance.
  • Increased emissions that may cause your vehicle to fail an emissions test.

What causes the P2239 code?

• Common causes for this fault code include:
  • Damaged wiring or connectors in the positive current control circuit.
  • A faulty oxygen sensor.
  • Issues with the engine control unit (ECU) itself.
  • Short circuits or open circuits in the sensor circuit.
  • Poor connections at the sensor or ECU.

How to fix P2239?

• To resolve the P2239 fault code, follow these steps:
  • Inspect the wiring and connectors related to Bank 1 Sensor 1 for any visible damage or corrosion.
  • Test the oxygen sensor to ensure it's functioning properly; consider replacing it if it's faulty.
  • Check for any damaged fuses that may affect the sensor circuit.
  • If there are no issues with the sensor or wiring, a more in-depth diagnostic of the ECU may be necessary to rule out other problems.