He then took A1 Team Great Britain's first ever A1 Grand Prix pole position in the next round in Indonesia, but he lost out in the races, failing to turn those pole positions into a win, and in Mexico he struggled in qualifying, ended up down the order in unfamiliar territory, and just missing out on the points in the sprint race in 11th, but improving in the feature race to 6th position. At Mazda Raceway Laguna Seca Kerr raced his last two races for A1 Team Great Britain in the season. In a rain-sodden sprint race Kerr finished 4th behind Mexico, France and Portugal. In the feature race he finished 3rd behind Mexico and A1 Team Germany. Kerr did not race at Shanghai to prepare for the 2006 World Series by Renault, and his place was taken by Indy Racing League driver Darren Manning.