Description of defect

Due to improper fuel injection control in the electronic control unit of the prime mover, if the vehicle is driven frequently at high speed and high load, the engine warning light may illuminate when the OBD diagnoses catalyst deterioration.

Improvement details

In addition to changing the programme of the engine control unit, the deterioration of the catalyst should be diagnosed and, if the catalyst has deteriorated, the exhaust pipe with integrated catalyst should be replaced.

Chassis number of target vehicles

Impreza

ＧＨ２－００２００１～ＧＨ２－０１６８７３
ＧＨ３－００２００１～ＧＨ３－００７７６４

Automotive maintenance cannot determine the cause based on symptoms alone.
Be sure to perform diagnosis and inspection before determining the cause of the failure.