Code
P0136
Emissions
O2 sensor circuit malfunction — Bank 1 Sensor 2
The downstream oxygen sensor circuit has a fault.
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Most likely causes
- Faulty downstream O2 sensor
- Wiring fault
- Catalyst issue
Symptoms you may notice
- Check engine light
Checks to run
- Test the sensor
- Check wiring
- Verify catalyst activity
Tools you may need
Multimeter
OBD-II scanner
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.
Related codes in Emissions
P0420