The most common cause of p0135 (o2 sensor circuit no activity detected (bank 1 sensor 1)) is Fix the p0135 code fast Using a simple multimeter, we break down what actually causes this code and how to fix it properly.
Code P0135 - Heated Oxygen Sensor Heater Circuit Malfunction (Bank1
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P0135 means your upstream oxygen sensor (bank 1, sensor 1) isn't communicating properly
It indicates a problem with the front oxygen sensor on bank 1, specifically.
