where is heater sensor

Question

2003 3.4 impala 02 sensor located

Answer 1

Hi there

The O2 sensors are in the exhaust pipes and manifolds. The code will usually indicate which sensor needs to be replaced. Without the code I can't be specific as to which one you will need. Sensor 1 is the sensor before the converters, sensor 2 is always after the catalytic converters.