I am getting a P1135 code on my 2005 Toyota Camry.I have replaced the A/F sensor first with a Bosch then with a Denso. I am still getting the same trouble code almost immediately after starting the car up. I checked the connector for power at the connector and I have power at the lower right male connector. What is my next step?

  • What size engine? Jun 19, 2015 at 20:42
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    Also you list the code as a P1135 which is an O2 Sensor code, but you said you replaced the Air Flow sensor. Also P1135 doesn't come up as a valid code for this make, model, year. Jun 19, 2015 at 20:47
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    if you get an engine code, don't just assume the sensor is bad, maybe it's working fine but the sensory input (emissions in this case) is what trips the threshold.
    – amphibient
    Jun 19, 2015 at 20:54
  • no, air flow is measure by a MAF sensor. an A/F sensor is the Air/fuel sensor. different from an O2 sensor, but serves the same purpose. i think a p1135 is usually a heater circuit code. could be a wiring issue or bad/wrong sensor. double check the part number on the new sensor
    – user4546
    Jun 20, 2015 at 0:59

1 Answer 1


P1135: AFR Sensor Heater Circuit Malfunction Bank 1 Sensor 1

As discovered, the malfunction doesn't necessarily have to be in the sensor itself.

Possible causes for a P1135 code include:

  • Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 (already ruled out by replacement)
  • Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 harness is open or shorted
  • Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

A faulty ECM is possible, but not probable, so the CEL is likely due to a break in the heater circuit which you will need to trace.

A very nice video by Schrodinger's Box shows him diagnose a similar problem on a Nissan Maxima.

  • BAM ------- consider this question answered! Dec 23, 2015 at 21:13

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