2002 chevy malibu v-6 3100. didnt pass smog because of check engine light on. Plugged it in into the code reader and it came said i needed a new 02 sensor(oxygen sensor.) Is there only one of these 02 sensors on my malibu? Where is this located? Does anyone know about how much a shop charges to install it, i already bought one 02 sensor at kragen.
