Seller notes

This Oxygen O2 Sensor is a new, aftermarket replacement part that has the following specifications: Note: For clarification purposes Upstream location is between the catalytic converter and the engine Downstream location is between the catalytic converter and the tailpipe If you have a bad O2 sensor causing your vehicle to run badly or fail an emission test then this is the part for you. Replaces many dealer part numbers including: 3921023710, 3921023750 Upstream or Downstream Sensor as listed p...

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