Question 1

What does P0137 mean?

Accepted Answer

P0137 - O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2). Downstream O2 sensor on bank 1 reading consistently low voltage (lean).

Question 2

What are the symptoms of P0137?

Accepted Answer

Check engine light, May accompany P0420

Question 3

What causes P0137?

Accepted Answer

Faulty downstream O2 sensor, Exhaust leak after catalyst, Wiring issue

Question 4

How much does it cost to fix P0137?

Accepted Answer

Typical repair cost: $80-$250. If P0420 is also present, replace the downstream O2 sensor first — it may be the real cause of both codes.

P0137 — O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

Don't guess — diagnose P0137 the right way