Question 1

What does P0151 mean?

Accepted Answer

P0151 - O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1). Upstream O2 sensor on bank 2 reading consistently lean.

Question 2

What are the symptoms of P0151?

Accepted Answer

Check engine light, Rough idle, Lean condition bank 2

Question 3

What causes P0151?

Accepted Answer

Vacuum leak bank 2, Faulty O2 sensor, Exhaust leak before sensor, Low fuel pressure

Question 4

How much does it cost to fix P0151?

Accepted Answer

Typical repair cost: $80-$300. If P0174 is also present, fix the lean condition first.

P0151 — O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)

Don't guess — diagnose P0151 the right way