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Re: P0135 Code- Any Danger?
P0135 is set in memory when the PCM does not detect O2 sensor voltage switching above and below the bias voltage within a specified period of time after a start up. It has nothing to do with coolant temp. The oxygen sensor itself must be OK or it would have set a DTC for it. Only the heater portion of the sensor is not operating. The only problem you could expect is that it will take a longer period of time for the HO2S to heat up on its own, as a result, the PCM will remain in open loop longer. It's very doubtful you'd notice a difference in fuel mileage or perfromance.
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