What does OBD2 code P0131 mean?+
P0131 stands for O2 Sensor Circuit Low Voltage Bank 1 Sensor 1. Upstream O2 sensor on Bank 1 is reading lean (low voltage) all the time.
What causes code P0131?+
Exhaust leak before sensor; Vacuum leak causing lean mixture; Faulty O2 sensor; Low fuel pressure
How do I fix code P0131?+
Smoke test for vacuum leaks; Check for exhaust leaks; Check fuel pressure; Replace O2 sensor
How much does it cost to fix P0131?+
Estimated repair cost for P0131 is $150–$400.
Is P0131 DIY-friendly?+
Yes — P0131 is generally DIY-friendly with basic tools.