Question 1

What does P0136 mean?

Accepted Answer

P0136 - O2 Sensor Circuit (Bank 1 Sensor 2). Downstream (post-cat) O2 sensor on bank 1 has a circuit problem.

Question 2

What are the symptoms of P0136?

Accepted Answer

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

Question 3

What causes P0136?

Accepted Answer

Failed downstream O2 sensor, Wiring damage from exhaust heat, Corroded connector

Question 4

How much does it cost to fix P0136?

Accepted Answer

Typical repair cost: $80-$250. A faulty downstream sensor can trigger false P0420. Replacing a $100 sensor is cheaper than a $1,500 cat.

P0136 — O2 Sensor Circuit (Bank 1 Sensor 2)

Don't guess — diagnose P0136 the right way