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So, Problem has been resolved. The Natural Switch in the gearbox for 1st,3rd,5th gear had been too worn and was giving a false reading causing the light to come on at deceleration. so, once that was replaced worked like a brand new car again. Also tested the relay after we replaced the iac valve. So...

We checked all the potential issues that yous have recommended and nothing has given results unfortunately. Did a theory testing and the light will always come on decelerating from 100-80 at 2,400 rpm. Still stumped for idea's any other idea's would be great

Cheers
Ryan

The whole part '22650 aa034' was the part. The whole assembly, cheers

Did a service about 3 months ago. Replaced the valve body . No aftermarket air filters or hoses to my knowledge. When I did a service I also replaced the rear main seal and the two cranks half seal and a camshaft seal. Replaced the timing belt, clutch and fly wheel. No compression test to date.

Car is Impreza 1997 Rx 2 litre So, over the last say 6 months, I've had the engine light coming on when decelerating from anywhere over 60kmph. I've ran diagnostics on the computer and found out the error occurring was "24. Idle Control System Malfunction" I've taken my car into Subaru Geelong for a...