One problem related to fuel injector has been reported for the 2006 Toyota Matrix. The most recently reported issues are listed below.
November 18 my 2006 Toyota Matrix began to accelerate uncontrollably after filling up tank with fuel. I pulled the vehicle to the side of the road turned off the engine. The engine then would not start so it was towed to windsor Toyota dealership. Test drove & check for water in tank elimated code p0171 and gave me free injector cleaner. Should the dealer check gas pedal recall on his 2006.