:confused:The VRS has been mainly on good form this week, but had diagnostic test carried out by Skoda today to see if anything may be causing odd blips in amount of boost from the turbo. Came back fine except for code 16502 P0118 engine coolant temp. circ. high input 'sporadic'. No engine warning light and mechanic said car was running fine.

On the way home car lost virtually all power and I was left driving along dual carriageway at 10mph with my foot to the floor! Scary, I'll say. Managed to bring it back to life by letting off the accelerator then back on, and car suddenly gained more boost than I'd ever experienced from it. Plus, the turbo became noticeably louder. Got the car back to the Skoda garage where they ran another test to find the brake lights stuck on with relevant fault code and replaced brake light switch. Car is now running OK, but doesn't seem to have the oomph it had on being 'reborn'. What's going on? Does the temp sensor need changing, or could this brake issue have been the cause of my intermittent boost?

The brake switch will cut the throttle if faulty, I think you werent suffering a lack of boost, more a lack of throttle.

Temp sensor wil need changing, if its faulty it will effect your fueling.

Thanks Lummox.

Don't think I was entirely clear in my post. Before the brake issue, the car seemed to have more boost on some days than others. Could this be caused by the temp sensor? Temp gauge needle moves up to 90 fairly quickly and stays there, while fuel consumption on last fill was 36mpg.

The temperature guage uses a different sensor to the one used by the ECU for its fuelling.