What does OBD2 code P0151 mean?+
P0151 stands for O2 Sensor Circuit Low Voltage Bank 2 Sensor 1. Upstream O2 sensor on Bank 2 reading lean (low voltage) constantly.
What causes code P0151?+
Exhaust leak Bank 2; Vacuum leak on Bank 2 side; Faulty sensor; Low fuel pressure to Bank 2 injectors
How do I fix code P0151?+
Smoke test for vacuum leaks; Check exhaust for leaks; Test fuel pressure; Replace O2 sensor Bank 2
How much does it cost to fix P0151?+
Estimated repair cost for P0151 is $150–$400.
Is P0151 DIY-friendly?+
Yes — P0151 is generally DIY-friendly with basic tools.