2-Pack Oxygen Sensor For 2001-2004 Chevy Impala 3.4L - Upstream & Downstream O2 Sensors (4-Wire, Heated)

Got a check engine light on your 2001-2004 Chevy Impala with the 3.4L?

These two oxygen sensors will probably sort it out.

You get both the upstream (front) and downstream (rear) sensors—a complete set.

They're heated, 4-wire, narrow-band sensors that screw right in.

Direct fitment means no splicing or hacking.

Thread size is M18 with a 7/8 hex, and they use blade terminals.

They go before and after the catalytic converter, so your engine gets the right fuel trims and your emissions stay in check.

Brake brand, backed by a 1-year warranty.

If your Impala's been running rough or killing gas mileage, swap these in and see the difference.