P2627
OBD-II Diagnostic Code
Severity: ModerateWhat Does This Error Mean?
P2627 means the wideband oxygen sensor's pumping current circuit on Bank 1 Sensor 1 has an open circuit. The sensor cannot measure air-fuel ratio accurately. The sensor or its wiring is likely faulty.
Affected Models
- Vehicles with wideband/air-fuel ratio sensors
- Common on modern direct-injection engines
Common Causes
- Wideband O2 sensor failed
- Sensor wiring open circuit
- Sensor connector disconnected or corroded
- ECM sensor driver circuit fault
How to Fix It
-
Check the O2 sensor connector.
The sensor is upstream of the catalytic converter on Bank 1. Check the connector for corrosion or disconnection.
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Test sensor wiring continuity.
Wideband sensors have 5-6 wires. Check each for continuity between the sensor and ECM.
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Replace the wideband O2 sensor.
Wideband sensors are more expensive than traditional O2 sensors ($80-$200) but are a common replacement part.
Frequently Asked Questions
What is a wideband O2 sensor?
A wideband sensor measures the exact air-fuel ratio (not just rich/lean like traditional sensors). It is more accurate and used on modern engines for precise fuel control.
Can I use a traditional O2 sensor as a replacement?
No. Wideband sensors and traditional narrowband sensors are not interchangeable. Always use the correct sensor type for your vehicle.