Obdii code p0135 in a mazda indicates a fault in the heated oxygen sensor (ho2s) heater circuit, specifically for the sensor located before the catalytic converter.
The most common cause of p0135 (o2 sensor circuit no activity detected (bank 1 sensor 1)) is
Using a simple multimeter, we break down what actually causes this code and how to fix it properly.
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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.
Fix the p0135 code fast
Unlike p0141 (downstream sensor), this sensor directly controls the air.