The 2004 Checker Auto Parts 500 was the 34th stock car race of the 2004 NASCAR Nextel Cup Series season, the eighth race of the 2004 Chase for the Nextel Cup, and the 17th iteration of the event. The race was held on Sunday, November 7, 2004, before a crowd of 105,000 in Avondale, Arizona at Phoenix International Raceway, a 1-mile (1.6 km) permanent low-banked tri-oval race track. The race was extended from its scheduled 312 laps to 315 due to a green–white–checker finish. On the final restart, Dale Earnhardt, Inc. driver Dale Earnhardt Jr. would hold off the field on the final restart to win his 15th career NASCAR Nextel Cup Series win and his sixth and final win of the season.^[1] To fill out the podium, Ryan Newman of Penske-Jasper Racing and Jeff Gordon of Hendrick Motorsports would finish second and third, respectively.

Phoenix International Raceway – also known as PIR – is a one-mile, low-banked tri-oval race track located in Avondale, Arizona. It is named after the nearby metropolitan area of Phoenix. The motorsport track opened in 1964 and currently hosts two NASCAR race weekends annually. PIR has also hosted the IndyCar Series, CART, USAC and the Rolex Sports Car Series. The raceway is currently owned and operated by International Speedway Corporation.

The raceway was originally constructed with a 2.5 mi (4.0 km) road course that ran both inside and outside of the main tri-oval. In 1991 the track was reconfigured with the current 1.51 mi (2.43 km) interior layout. PIR has an estimated grandstand seating capacity of around 67,000. Lights were installed around the track in 2004 following the addition of a second annual NASCAR race weekend.

Qualifying was held on Friday, November 5, at 1:10 PM PST. Each driver would have two laps to set a fastest time; the fastest of the two would count as their official qualifying lap.^[2] Positions 1-38 would be decided on time, while positions 39-43 would be based on provisionals. Four spots are awarded by the use of provisionals based on owner's points. The fifth is awarded to a past champion who has not otherwise qualified for the race. If no past champ needs the provisional, the next team in the owner points will be awarded a provisional.^[6]

Ryan Newman of Penske-Jasper Racing would win the pole, setting a time of 14.930 and an average speed of 128.520 miles per hour (206.833 km/h).^[7]

Seven drivers failed to qualify: Mike Garvey, Tony Raines, Stanton Barrett, Mario Gosselin, Ryan McGlynn, Kirk Shelmerdine, and Geoff Bodine.