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P0135 Oxygen sensor heater isn't working (bank 1, sensor 1)

Generic SAE definitionO2 sensor heater circuit (Bank 1 Sensor 1)

Safe to driveNormal driving is fine. Book it in when it suits you; it won't hurt anything in the meantime.

Check this first

Check the fuse for the sensor heaters first – it's a cheap thing to rule out.

What usually fixes it

In the order a good shop checks them. Typical total: $33–$350 at $130 an hour.

  1. Fuse or relay

    $33–$64

    One blown fuse can take out the heater circuit.

  2. Oxygen sensor

    $128–$350

    The heater inside the sensor burns out; the sensor is replaced as one part.

Code titles are the generic SAE definitions. Prices are typical US parts and labor for a common car or light truck – a guide for judging a quote, not a quote. Always confirm a repair against the vehicle in front of you.

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The Trouble codes screen in Drive DTC: stored, pending and permanent counts, then C0040-13 explained in plain English with what to check first, likely fixes in order and typical cost ranges

More in Fuel and air

All 73 codes in this group
P0132O2 sensor circuit high voltage (Bank 1 Sensor 1) P0133O2 sensor circuit slow response (Bank 1 Sensor 1) P0134O2 sensor circuit no activity detected (Bank 1 Sensor 1) P0136O2 sensor circuit (Bank 1 Sensor 2) P0137O2 sensor circuit low voltage (Bank 1 Sensor 2) P0138O2 sensor circuit high voltage (Bank 1 Sensor 2)