Q: How do I know if my car has a faulty AYC ECU - and what do I do about it? A: There is a product recall that affects certain numbers of Evo 4 & 5 GSR models due to a faultly AYC ECU (Active Yaw Control Electronic Control Unit). It has been found that due to incorrect AYC ECU programming that the clutches that control the torque transfer can remain engaged on starting the engine. This can lead to premature wear and eventual failure of the AYC. Under the recall the faulty AYC ECU’s are required to be replaced with correctly programmed versions. The cars affected are the Evo 4 and 5 GSR’s built between December 20th 1996 and July 17th 1998. To find out if you need to take further action or how to proceed then contact your nearest Mitsubishi dealership or Colt Car Company Customer Services quoting your car’s VIN/Chassis number. The VIN/Chassis number appears on the VIN plate or on the engine bulkhead and will start with CN9A (Evo 4) or CP9A (Evo 5) followed by 7 digits. The new AYC ECU takes 30 minutes to fit and you will not be charged for its replacement. You can identify a replaced, correctly programmed AYC ECU as it will have a 5mm black dot stuck on the serial number label. Your nearest Mitsubishi dealership can be found on www.mitsubishi-cars.co.uk or alternatively Colt Car Company UK can be contacted on 01285 655777 (fax: 01285 658026) The Colt Car Company Ltd, Watermoor, Cirencester, Gloucs. GL7 1LF (This above applies to the UK only. People outside the UK should consult the official Mitsubishi/Ralliart importer for their country or Mitsubishi Japan on how to proceed with the recall.) Back to question page