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P0136 OBD-II Trouble Code
Technical Description
Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
What does that mean?
Essentially the same as P0137, a P0136 code refers to the second oxygen sensor on Bank 1. The O2 oxygen sensor produces a voltage between .1 mV and .9 mV. The ECM monitors O2 sensor voltage and determines if exhaust is lean or rich. O2 sensor voltage is high when exhaust is rich and low when exhaust is lean. The ECM monitors this voltage and increases or decreases fuel injector pulsewidth according to engine fuel/air ratio. If the ECM detects low HO2Sensor voltage for an extended period, it will set P0136 Conditions required to set: HO2 sensor voltage is low for longer than 2 minutes (minutes depend on model of vehicle. Could be up to 4 minutes)
Symptoms
There may be no visible symptoms to the driver. Poor fuel mileage, possible misfire, depending on O2 sensor position when sticking.
Causes
A code P0136 may mean that one or more of the following has happened:
- Faulty O2 sensor leak in exhaust close to O2 sensor
- Short to voltage on O2 signal circuit
- Open in circuit resistance caused by corrosion in connector
Possible Solutions
- Replace the second oxygen sensor on bank 1
- Repair open or short in signal circuit
- Clean corrosion from connector
Related P0136 forum topics
- 1997 Infiniti I30 P0600, P0130, p0136, p0325,p0500
- P0136, P0141(Sensor Heater Circuit Malfunction) Mits Eclipse
- P0136 on 97' Mazda 626
- P0133, P0136, P0302 ('98 Volvo S70)
- '02 Mitsubishi Galant P0135/p0136
- 96 Mustang GT: P0136 and P0156
- Passing Emission Test P0136 P0161 P0401 P0402 P0304
- 99 Corolla Code P0136
- ford codes p0136, p0141
Need more help?
If you still need help regarding this trouble code, please post your concern in the forums.
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