P0136: Oxygen Sensor Circuit Malfunction (Bank 1, Sensor 2)
Can you still drive? Yes, the vehicle is safe to drive. The downstream sensor primarily monitors emissions performance rather than controlling fuel delivery.
What Does P0136 Mean?
Code P0136 indicates a problem with the downstream oxygen sensor on bank 1 (the sensor after the catalytic converter). This sensor monitors catalytic converter efficiency by comparing its readings to the upstream sensor. A malfunction in this circuit can cause false catalyst efficiency codes and prevent the ECM from properly monitoring emissions performance.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Failed downstream oxygen sensor
- Wiring damage between sensor and ECM
- Exhaust leak near the sensor
- Water intrusion in sensor connector
- Corroded sensor ground
Symptoms
- Check engine light on
- Possible poor fuel economy
- May trigger P0420 catalyst code
- Failed emissions test
Diagnostic Steps
- 1Monitor downstream O2 sensor voltage with scan tool
- 2Check sensor wiring and connector for damage or corrosion
- 3Measure sensor signal voltage at ECM connector
- 4Check for exhaust leaks near the sensor
- 5Compare readings to known good sensor values
Recommended Parts & Tools
downstream oxygen sensor
O2 sensor socket
dielectric grease
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $100 - $350 |
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Frequently Asked Questions
What is a bank 1 sensor 2?
Bank 1 sensor 2 is the downstream oxygen sensor located after the catalytic converter on the bank that contains cylinder 1. It monitors catalyst efficiency.
Can P0136 cause other codes?
Yes, a faulty downstream sensor can trigger false P0420 catalyst efficiency codes since it cannot properly monitor converter performance.
Community Fix Reports
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