O2 Sensor Pumping Current Trim Circuit/Open Bank 2 Sensor 1
Code P2629 indicates an issue with the oxygen sensor's pumping current trim circuit for Bank 2 Sensor 1. This sensor is typically located after the catalytic converter and monitors exhaust oxygen levels. The 'pumping current trim' refers to the sensor's internal calibration circuit that adjusts the pumping current to maintain a stoichiometric air-fuel ratio. An open circuit or malfunction in this trim circuit can cause inaccurate readings, leading to improper fuel trim adjustments and potential drivability issues.
1. Most Common Causes
- Faulty oxygen sensor (Bank 2 Sensor 1)
- Open or shorted wiring in the sensor circuit
- Corroded or damaged connector
- Blown fuse related to the oxygen sensor heater circuit
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle or hesitation
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the O2 sensor wiring and connector for damage, corrosion, or loose connections.
Step 3: Use a multimeter to check for continuity and proper voltage in the sensor circuit.
Step 4: Test the sensor's heater circuit resistance and compare to specifications.
Step 5: If wiring is intact, replace the Bank 2 Sensor 1 oxygen sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but prolonged driving may cause reduced fuel economy and potential damage to the catalytic converter. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. The sensor itself costs $50-$150, and labor adds $100-$250 depending on vehicle accessibility.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.