Check engine light on? Type your code.

Common codes
P0420P0300P0171P0455P0442P0128P0401P0113

P0136: Downstream O2 sensor circuit malfunction (Bank 1 Sensor 2)

You can keep driving. Get it checked when convenient.

Can I drive with P0136?

Yes, you can keep driving. Downstream sensor only monitors catalyst efficiency; drivability and engine safety are unaffected.

What does P0136 mean?

P0136 stands for O2 Sensor Circuit Malfunction (Bank 1, Sensor 2).

Symptoms you may notice

  • Check engine light on with no noticeable change in how the car drives
  • Vehicle fails state emissions smog test
  • Normal engine power and shifting

How much does it cost to fix?

Repair costs for code P0136 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:

  • Faulty downstream oxygen sensor
    $70-$190 common
  • Damaged underbody wiring from road debris
    $35-$90 common
  • Corrosion in the undercarriage connector
    $20-$50 possible
  • Exhaust leak near the catalyst outlet
    $50-$160 rare

What to do next

  1. Crawl under the car to inspect the downstream sensor wiring for tears or snags.
  2. Inspect connector for road salt corrosion or water intrusion.
  3. Replace the downstream Bank 1 Sensor 2 oxygen sensor.
Last updated: October 2026

Related codes

P0137 P0138 P0141 P0420
General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.

About this code

Code P0136 refers to the secondary oxygen sensor positioned after the catalytic converter on Bank 1. This sensor does not control air-fuel mixtures—its sole job is to monitor whether the catalytic converter is cleaning exhaust gases. A failure here causes minimal immediate drivability symptoms, though you must fix it to pass state vehicle inspections.