C20LET Boost too high at idle

[SukySaggi]

The engine management light has come on and the reason is boost too high at idle.
Anyone know the reason for this?
Car drives fine and no other problems. But I don't want that engine light in my face.

[Stupink]

also check the vacuum pipe that leads to the ECU. at idle it should be negative figures relative to atmosphere, so if its reading atmospheric, then this is boost "too high".. (easiest way is to pop it off the inlet and suck on it and stick your tongue over the end while you do it.. you should be able to maintain vacuum for a reasonable ammount of time, which you'll feel as you take your tongue off.. disclaimer, disinfect first lol..) can be leaks between inlet and pipe, or pipe to ecu, or they have been known to leak internally in the ecu from the inlet to the sensor.