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Fault code guide

P0135: O2 Sensor Heater Circuit Bank 1 Sensor 1

Plain English for owners who are not mechanics. We show where each answer comes from, and we say so when it is not known.

What the dictionary says

O2 Sensor Heater Circuit Bank 1 Sensor 1

Source: generic entry in the MIT-licensed dtc-database · view source file

P0135 is a generic OBD fault code. The fault-code dictionary we use defines it as "O2 Sensor Heater Circuit Bank 1 Sensor 1". Below: the source entry, manufacturer entries, related codes and the terms explained.

Manufacturer entries in the dictionary

  • Audi

    Defective Oxygen Sensor/Air Fuel Ratio Sensor, defective Oxygen Sensor/Air Fuel Ratio Sensor Heater Circuit, Exhaust System Leak, Intake Air System leak, Low Fuel Pressure, Defective Engine Coolant Temperature Sensor, Defective sensor wiring and or circuit problem, PCM software needs to be updated, Defective PCM

    Source file · Listed as written in this source file. Not ranked; a workshop must confirm what applies to your car.

Reading the code P0135

  • First character: P: Powertrain (engine, transmission and ignition)
  • Second character: 0: a generic code defined by SAE, meant to mean the same thing on every make
  • Last three characters: 135: The specific fault within that category.

Reference: On-board diagnostics (Wikipedia)

Terms in this code

  • O2 (oxygen) sensor: A sensor that measures how much oxygen is in the exhaust gas. More

Related codes

  • P0141 O2 Sensor Heater Circuit Bank 1 Sensor 2
  • P0155 O2 Sensor Heater Circuit Bank 2 Sensor 1
  • P0031 HO2S Heater Control Circuit Low Bank 1 Sensor 1
  • P0032 HO2S Heater Control Circuit High Bank 1 Sensor 1

Singapore notes

LTA's periodic inspection checks a car's exhaust emissions and noise against the prevailing standards, as well as brakes, steering, lights and structure. Cars under 3 years old have no periodic inspection, cars aged 3 to 10 years are inspected every 2 years, and cars over 10 years every year. The dictionary does not say how this code affects an inspection, so ask the inspection centre or a workshop. LTA: vehicle inspection

Need a workshop? See workshops owners recommend or the Subaru list.

What this page does not tell you

The dictionary does not establish repair costs, how likely each cause is, or whether the car is safe to drive. Get a workshop diagnosis and a written quote before paying for parts.

For a make-specific answer, use the lookup below with your make and model. The dictionary has 93 Subaru-specific entries among 18,805 in total.

Look up P0135 for your car

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