Critical Safety risk Powertrain-code

P0036

P0036 Heated Oxygen Sensor Control Circuit B1S2

Detailed information on troubleshooting and repairing a P0036 DTC code which refers to a problem in the HO2S heater control circuit. Also includes links to relevant forum topics on the code.

Pull over safely and book service immediately

This code is flagged as a safety risk and rated Critical. Avoid driving until a technician has inspected the vehicle.

Symptoms

  • Open circuit inside oxygen sensor or open power or ground wires to oxygen sensor
  • Exhaust system ground strap may have become corroded or broken
  • PCM/ECM or oxygen sensor heater circuit wiring has failed

Likely causes

  • Open circuit inside oxygen sensor or open power or ground wires to oxygen sensor
  • Exhaust system ground strap may have become corroded or broken
  • PCM/ECM or oxygen sensor heater circuit wiring has failed
Labor estimate
2h typical
Range: 1h – 4h
Parts cost
$0 – $500
Range varies by year/make/model

Information shown is reference-grade and may vary by vehicle. Always have a qualified technician confirm the cause before any repair.