P2252 Fault Code

O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 1

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

The P2252 fault code refers to an issue within the O2 (oxygen) sensor's negative current control circuit for Bank 1 Sensor 1. This sensor is critical for monitoring the oxygen levels in the exhaust gases, allowing the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion efficiency. If the sensor's circuit detects a low current, it might not function properly, leading to performance issues.

What are the symptoms of the P2252 code?

• Poor fuel economy due to improper air-fuel mixture.
• Engine misfires or rough idling.
• Increased emissions, possibly leading to a failed emissions test.
• Illuminated check engine light on the dashboard.

What causes the P2252 code?

• Faulty O2 sensor.
• Damaged wiring or connectors in the O2 sensor circuit.
• Corrosion or poor connections causing resistance.
• ECM issues affecting sensor readings.
• Vacuum leaks leading to incorrect air-fuel ratios.

How to fix P2252?

• Inspect the O2 sensor and its wiring for damage or corrosion.
• Replace the O2 sensor if it is defective.
• Repair any damaged wiring or connectors in the circuit.
• Clear the fault code and conduct a test drive to ensure the issue is resolved.