How many O2 sensors? One in front and one behind converter? Have conflicting responses from part stores. Dealer says converter needs replacement. $800. Where can I find good how-to for replacing?

 

The V6 has 3 converter (2 are primary converters). The two primary converters each have a separate air-fuel ratio sensor and a secondary heated oxygen sensor. So, 4 sensors in total.

Front primary converter sensors:
front air-fuel ratio sensor
front secondary heated oxygen sensor

Rear primary converter sensors:
rear air-fuel ratio sensor
rear secondary heated oxygen sensor


Air-fuel ratio sensors are a wide-band type of oxygen sensor.

 

FYI- Under federal law, automobile manufacturers have to honor a 80,000 mile warranty on all catalytic converters.