P2255 Fault Code

O2 Sensor Negative Current Control Circuit Low Bank 2 Sensor 1

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

The P2255 fault code signifies an issue with the oxygen sensor's negative current control circuit on Bank 2, specifically for Sensor 1. This trouble code indicates that the electrical signal from the oxygen sensor is lower than expected. This code is crucial for maintaining optimal air-fuel mixture and emission control in the vehicle.

What are the symptoms of the P2255 code?

Common symptoms associated with the P2255 fault code are:

• Poor fuel economy due to improper air-fuel mixture.
• Increased exhaust emissions, potentially leading to failed emissions tests.
• The check engine light illuminated on the dashboard.
• Rough engine idle or hesitation during acceleration due to imbalanced fuel delivery.

What causes the P2255 code?

The primary causes of the P2255 code include:

• Defective oxygen sensor.
• Damaged wiring or connectors in the oxygen sensor circuit.
• Poor electrical connections or corrosion.
• Malfunctioning Engine Control Module (ECM).
• Issues with the exhaust system affecting sensor readings.

How to fix P2255?

To resolve the P2255 code, consider the following steps:

• Inspect the oxygen sensor and its wiring harness for any visible damage or corrosion.
• Test the oxygen sensor's operation to determine if it is functioning poorly or not at all; replace if necessary.
• Ensure all electrical connections are clean and secure.
• Check for exhaust leaks that might be affecting sensor readings.
• If all else fails, have the vehicle's Engine Control Module checked for proper operation.