Got a check engine light for O2 sensors on your Nissan Maxima or Quest? This complete set includes 2 upstream (air/fuel ratio) sensors AND 2 downstream sensors – all 4 you need for the 4.5L V8 engines in 2004-2007 Maxima or 2004-2009 Quest. Replacing them as a set is smart, since they wear together. These sensors monitor exhaust gases to help your engine run efficiently and cleanly. Poor sensors can cause rough idle, bad fuel economy, or failed emissions tests. This kit ensures everything matches and works together. Each sensor is individually packed in protective bubble wrap. Comes with a one-year quality guarantee. Before buying, double-check your vehicle's year, model, engine size (must be 4.5L), and note any specific trim details. Restore performance, fuel efficiency, and clear those error codes with a matched set of reliable O2 sensors.
