The heater circuit in the upstream oxygen sensor on bank 1 has failed.
Informational only. Consult a qualified mechanic.
Check the fuse and replace the O2 sensor.
The P0135 OBD-II diagnostic trouble code (DTC) indicates: o2 sensor heater circuit b1s1. This is a low-severity powertrain code that your vehicle's onboard diagnostics system triggers when the heater circuit in the upstream oxygen sensor on bank 1 has failed. If your check engine light is on with this code, the vehicle is generally safe to drive, but you should have it inspected soon.
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