I have a 2003 GU patrol 3.0 with 325000km on the clock . The only engine modification is a Roo Systems exhaust and chip which I fitted 3 tears ago.
Recently my engine check light came on so Off the mechanic I went,
he put the analizer on and got a low boost indication and he also found:

1. two snapped studs.
2. leaking intercooler
3. damaged gaskets.

He fixed the above and cleaned the inlet manifold and EGR, replaced the intercooler with a second hand one (which had less leaks).

After this the engine ran better but after running for about 5 minutes under load the engine check light came on, this occured after 3000rpm in 2nd or 3rd gear. He traced the engine check light to a faulty senser on the intercooler, so we put another second hand one in and the light went out.

I have driven the car for a week no light and this morning it came back on.

I have also put in a new fuel filter and a catch can.

When the light came on yoiu cabn notice the drop in power around 2500 to 3000 rpm.

Any suggestions?