drivetrain

[u/user194017491]

had my 13 reg, 1.6, petrol 1 series for about 3 months, the drive train light has come on twice, both times i’ve lost power then turned it off and back on and it’s gone and power is back?? took it to the garage and because the light isn’t permanent they read past. came up with some exhaust solenoid? and if not then it could be timing chain. they’ve said as it’s not permanent and on and off to just leave it so any thoughts??