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P1155 Toyota -

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service engine light came on. Checked with code reader and read dtc p1155.

Vehicle: 2003 toyota rav4 2l

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P1155 A/F sensor heater circuit malfunction Bank 2 Sensor 1

When the Airflow sensor (sometimes reffered to as the 02 sensor) degrades the heater circuit usually  fails first, Being sensor 1 this make it the engine management sensor or the upstream sensor.

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