P0136: O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)
2 vehicles · 2 makes · $90-$320 repair
Most Reported On
P0136 is an OBD-II diagnostic trouble code meaning “O2 Sensor Circuit Malfunction (Bank 1, Sensor 2).” This code indicates a malfunction in the downstream oxygen sensor circuit for bank 1, sensor 2 — the O2 sensor located after the catalytic converter on the engine side containing cylinder 1. This rear sensor's main job is to monitor how well the catalytic converter is working by checking the oxygen content of the cleaned exhaust. The computer sets this code when the sensor's signal is out of range, implausible, stuck, or its circuit appears faulty. It generally points to the downstream sensor, its wiring or heater circuit, or an exhaust leak, rather than an immediate engine performance problem. This code is most commonly reported on 1998-2002 Chevrolet Prizm, and 2003-2008 Toyota Corolla (CE, LE, S), with repair costs ranging from $90 to $320.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0136, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P0136 mean?
P0136 stands for "O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)." This code indicates a malfunction in the downstream oxygen sensor circuit for bank 1, sensor 2 — the O2 sensor located after the catalytic converter on the engine side containing cylinder 1. This rear sensor's main job is to monitor how well the catalytic converter is working by checking the oxygen content of the cleaned exhaust. The computer sets this code when the sensor's signal is out of range, implausible, stuck, or its circuit appears faulty. It generally points to the downstream sensor, its wiring or heater circuit, or an exhaust leak, rather than an immediate engine performance problem.
What are the most common causes of P0136?
The most common causes of P0136 are: Failed or aged downstream oxygen sensor, Damaged O2 sensor wiring, connector, or heater circuit, Exhaust leak near the rear sensor, Open or short in the sensor heater power supply, Corrosion or poor connection at the sensor connector, Contaminated sensor (oil, coolant, or fuel additives), Faulty engine control module (rare). The specific cause varies by vehicle.
How much does it cost to fix P0136?
Repair costs for P0136 range from $90 to $320, depending on the vehicle and root cause.
Which vehicles are affected by P0136?
Au7o has documented P0136 across 2 vehicle models from 2 manufacturers: Chevrolet, Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.