Two problems related to loud engine noise have been reported for the 2003 Toyota Matrix. The most recently reported issues are listed below.
The contact owns a 2003 Toyota Matrix. While driving at 35 mph, a very loud noise emitted from the engine. The contact stated that the vehicle was towed to an independent mechanic for diagnostic testing. The results of the diagnostic were unknown, but the vehicle was repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 112,000.
On 6 September 2007,my wife was driving the 2003 Matrix, when without warning the motor started to make an excessive noise in the engine, she pulled over a called me, I met her where she was and verified the noise sounded terminal, called for a wrecker, had car towed to the dealer, 2 days later, I was informed that the engine had thrown 3 rods, mileage on the car was 60,886, just out of warranty, spent the next week in Toyota USA arbitration,they deem lack of lubrication caused the damage and washed their hands of the engine repair. On 21 September, I paid almost $4500, for what was supposed to be a new short block. Well, the new short block has as much road grime as the transmission, and 52 miles later the engine was "whistling", opened the hood to check the engine, the coolant was 1/2 gallon low, the oil is 1/2 quart low and a couple of loose bolts, one of which mounts the accelerator cable/bracket to the engine. Called the dealer, the service department was closed, but the receptionist recommended I go buy antifreeze and oil at the local supermarket. I once again, called Toyota USA, created another ticket with them. . Currently impatiently waiting for Monday morning when I can go to the dealer/service department. .