Andersson was competing in the Junior World Rally Championship since 2003. He became JWRC champion in 2004 during his first complete season. Piloting a Suzuki Ignis S1600, he earned three wins, a second place, an eight place, and two retirements. He scored 39 points during this year while runner-up Nicolas Bernardi, piloting Renault Clio S1600, scored only 2 fewer points.
In 2005, Andersson continued competing in the JWRC with Suzuki Ignis S1600 and later Suzuki Swift S1600. Although he won Rally Acropolis, the rest of the season wasn't that successful, and he finished sixth with 30 points.
In 2006, Andersson was still racing in JWRC with a Suzuki Swift S1600. He won Rally Sweden but was excluded from Rally Turkey and crashed at Rally GB. He finished the season in third place with 29 points. Second place was Urmo Aava piloting a Suzuki Swift S1600 with 31 points, and Patrik Sandell became JWRC champion piloting a Renault Clio S1600 with 32 points.
In 2007, Andersson became Junior World Rally Champion for a second time with a Suzuki Swift S1600. Andersson won three rallies, scored one second place and one fourth place. Runner-up was Urmo Aava piloting a Suzuki Swift S1600 and third was Martin Prokop piloting a Citroen C2 S1600.
With two JWRC titles, Andersson was chosen by the factory WRC team, Suzuki World Rally Team, in the 2008 season. He started the season by finishing eighth at the 2008 Monte Carlo Rally in his first rally in a World Rally Car. He suffered from many mistakes and retirements during the season, finishing in the points only four times. His best result came in the last two rallies of the season, fifth places at Rally Japan and Rally GB.
After the withdrawal of the Suzuki team at the end of 2008, Andersson was left without a regular drive for 2009. A drive in an ageing Škoda Fabia at Rally Norway saw two stage wins and a place in the top six on the first day before clutch problems forced him to retire.
In 2010, Andersson was racing in SWRC with Škoda Fabia S2000, and won SWRC Rally Sweden. Although he was later removed from SWRC 2010 standings, his victory in Sweden counted. His entrant, Rufa Sport, failed to compete in the required number of events, meaning all of Andersson's points scored with the team were annulled. His win in Sweden remained as he competed as a wildcard entrant and not with Rufa.
In 2011, Andersson competed in two WRC events with a Ford Fiesta RS WRC, finishing seventh in Sweden and in Italy. He drove Tommi Mäkinen Racing's Subaru Impreza STi R4 on Rally Finland, finishing fifteenth.
He was also signed by Proton Motorsport to drive one of the Satria Neo S2000s in the Intercontinental Rally Challenge. The team's season was full of mechanical failures. The competitiveness of the car was also poor compared to that of rivals, such as the Skoda Fabia S2000 and Peugeot 207 S2000; he only scored points in the Barum Czech Rally Zlín, finishing ninth.
In 2012, Proton decided to enter the S2000 World Rally Championship (SWRC), with Andersson as their number one driver. The season started off with Andersson leading almost till the end of the Monte Carlo Rally, but he was forced to retire due to fire. In Sweden, he bounced back, and won the SWRC category. He followed this up with a second place in New Zealand, and with a win in Finland. However, due to various problems and retirements in Wales and France, Craig Breen passed Andersson to claim the lead of the category, and with Andersson unable to win in Spain, he finished runner-up to the Irishman.
According to the information available, Andersson's career in rally driving includes his achievements in the Junior World Rally Championship and his participation in various other rally events.
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