P2626 Oxygen Sensor Pumping Current Trim Circuit Open Bank 1 Sensor 1

Definition: The OBD2 code P2626 indicates that there is an open circuit in the oxygen sensor pumping current trim circuit for bank 1, sensor 1. This means that the Engine Control Module (ECM) has detected a problem with the electrical circuit of the oxygen sensor located before the catalytic converter on bank 1.

p2626 – Oxygen Sensor Pumping Current Trim Circuit Open Bank 1 Sensor 1

Typical Severity: Moderate

Common Causes

p2626 – Oxygen Sensor Pumping Current Trim Circuit Open Bank 1 Sensor 1

Common causes of this OBD2 code include:

• Faulty oxygen sensor
• Open or short circuit in the wiring harness
• Poor electrical connection at the oxygen sensor
• Exhaust leaks near the oxygen sensor
• Issues with the engine control module (ECM)

 

Common Misdiagnosis

OBD2 Code: P2626

Description: Oxygen Sensor Pumping Current Trim Circuit Open Bank 1 Sensor 1

Common Misdiagnosis: Replacing the oxygen sensor without checking for wiring issues or a faulty PCM (Powertrain Control Module).

 

Common Diagnostic Steps

OBD2 Code: P2626

Description: Oxygen Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 1

• Check for any additional codes that may be present and address them first.
• Inspect the wiring and connectors for damage, corrosion, or disconnection at the oxygen sensor (Bank 1 Sensor 1).
• Test the voltage and ground supply to the oxygen sensor using a multimeter.
• Verify the integrity of the oxygen sensor’s signal circuit. Check for continuity and proper resistance levels.
• If equipped, use a scan tool to monitor live data from the oxygen sensor to ensure it is functioning correctly.
• Replace the oxygen sensor if it is found to be faulty after testing.
• If all tests pass but the code persists, consider checking for an issue with the vehicle’s PCM/ECM as a last resort.