Ranger was the 2002 Canadian Formula A Karting champion and 2003 North American Fran Am 2000 Pro Champion. He raced in the Toyota Atlantic series in 2004 with number 27, the same as Quebec racecar drivers Gilles Villeneuve and Jacques Villeneuve, scoring six podiums (top 3 finishes) and winning the Rookie of the Year award.

Ranger made his debut in the Champ Car World Series in 2005 with Conquest Racing, also driving the #27 car. He became the youngest driver in the series’ history to finish on the podium with a second place at Monterrey. After a few solid finishes at the beginning of the season, Ranger’s year went downhill as he mostly struggled in the second half of the season, but held on to 10th in the points championship. In 2006, he remained with the Conquest Racing team. He ranked 10th in the standings with a best finish of 5th at the 2006 Lexmark Indy 300.

In 2009, he was the class of the field for the NASCAR Canadian Tire Series winning the Dickies 200 at Mosport International Raceway, the A&W 300 at SunValley Speedway (his first ever oval), The Rexall Edmonton Indy, Vortex Brake Pads 200 at Mosport International Raceway, the GP3R 300 at Circuit Trois-Rivières and the Komatsu 300 At Riverside Speedway. On top of all of this he has 2 poles and many podium finishes. Ranger ended up winning the title by 167 points for his 2nd Championship in 3 years.

He drove for Fitz Motorsports at the August 2008 NASCAR Nationwide Series race at Circuit Gilles Villeneuve in Montreal and he also drove for the team in four of the remaining 10 races of 2008 with a best finish of 19th at Bristol Motor Speedway. In 2009, he drove the number 11 Tide/Ridemakerz.com /Toyota Camry to a 3rd-place finish after leading many laps in the 2009 Napa Auto Parts 200 at Circuit Gilles Villeneuve. For 2010 he will drive for the #27 Baker-Curb Racing Nationwide team with sponsorship from Dodge including Montreal.

For 2010, Ranger drove part-time at the NASCAR Canadian Tire Series with the #27 Dave Jacombs Dodge. He ran some races for the #35 Waste Management Chevy in the NASCAR K&N Pro Series East and West series. He won the race at Infineon Raceway in the K&N Pro Series West on June 20. He picked up the win from pole in Lime Rock Park in the K&N Pro Series East series. On July 17, he won from the pole at the Toronto Indy 100, being the first driver to win all 3 NASCAR regional touring series in one year. His 3rd win of the year was at Trois-Rivières and at Circuit Gilles Villeneuve where he bumped Jason Bowles from the last turn for the win both times from the pole. In 2011 he again won at Montreal and Toronto on a limited basis schedule.

Ranger raced in the K&N Pro Series and the NASCAR Canadian Tire Series again in 2011. On May 22, 2011, Ranger won the ARCA race on the road course at New Jersey Motorsports Park in Millville, New Jersey. On June 25, 2011, Andrew competed in the NASCAR Nationwide Series race at Road America finishing sixth. Ranger made his Sprint Cup Series debut at Watkins Glen finishing 35th for FAS Lane Racing.

For 2012, Ranger ran in the NASCAR Canadian Tire Series and Nationwide Series for GC Motorsports. He won two Canadian Tire events in his home province of Quebec at Circuit Gilles Villeneuve and Circuit ICAR along with the ARCA event at New Jersey Motorsports Park.

In 2013 Ranger ran a partial schedule in the Canadian Tire Series. He also ran the road courses in the NASCAR Nationwide Series and in the ARCA Racing Series. He won at New Jersey Motorsports Park in the ARCA Racing Series for the third year in a row.

For the 2014 NASCAR Canadian Tire Series, Ranger left Dave Jacombs’s team and joined D.J. Kennington’s DJK Racing to drive the #27 Dodge.