What Does P2626 Mean?
The oxygen sensor's pumping current trim circuit for Bank 1 Sensor 1 (upstream sensor) has an open circuit or electrical fault. This indicates the PCM cannot properly control the wide-band oxygen sensor's pumping cell used for precise air/fuel ratio measurement.
Common Causes
45%
Faulty oxygen sensor internal circuit or pumping cell failure
30%
Damaged or corroded wiring harness or connector to O2 sensor
15%
Poor ground connection at sensor or ECM
10%
PCM/ECM internal driver circuit failure
Diagnostic Steps
1
Step 1: Visually inspect O2 sensor connector and wiring for damage, corrosion, or loose connections
2
Step 2: Check sensor ground circuits for continuity and resistance (should be less than 1 ohm to chassis ground)
3
Step 3: Measure pumping current circuit voltage and resistance at sensor connector per manufacturer specifications
4
Step 4: Monitor O2 sensor data PIDs for abnormal readings or lack of signal
5
Step 5: If wiring and grounds are good, replace O2 sensor and retest; if problem persists, test PCM driver circuit
Estimated Repair Cost
$200 - $600
Parts + labor, varies by vehicle and location
The oxygen sensor's pumping current trim circuit for Bank 1 Sensor 1 (upstream sensor) has an open circuit or electrical fault. This indicates the PCM cannot properly control the wide-band oxygen sensor's pumping cell used for precise air/fuel ratio measurement.
The most common cause of P2626 (O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 1) is: Faulty oxygen sensor internal circuit or pumping cell failure
Typical repair costs for P2626 range from $200 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive short distances but fuel economy will suffer and emissions will increase. Extended driving may damage catalytic converter.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2626 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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