Question 1

What does P0036 mean?

Accepted Answer

P0036 - O2 Sensor Heater Control Circuit (Bank 1 Sensor 2). Heater circuit fault for the downstream (post-cat) O2 sensor on bank 1.

Question 2

What are the symptoms of P0036?

Accepted Answer

Check engine light, May trigger false P0420, No drivability symptoms usually

Question 3

What causes P0036?

Accepted Answer

Failed downstream O2 sensor heater, Wiring damaged by exhaust heat, Corroded connector, Blown fuse

Question 4

How much does it cost to fix P0036?

Accepted Answer

Typical repair cost: $80-$250. Downstream O2 sensor wiring runs along the exhaust and is often damaged by heat. Check the harness before replacing.

P0036 — O2 Sensor Heater Control Circuit (Bank 1 Sensor 2)

Don't guess — diagnose P0036 the right way