2002 Ford Escape V6 with engine code P0135, where is it located?
P0135 - 02 sensor heater circuit malfunction (bank 1 sensor 1)
Being sensor 1 this is an engine management sensor or the upstream 02 sensor, when a 02 fails the heater circuit is usually the first to fail after so many uses. The location is where cylinder number 1 is located, this 02 sensor is before the catalytic converter.
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