1.2TSI, 11 plate, 106k miles. Local garage replaced throttle housing, using non-OEM parts to save money. Since then the idle revs are low (just over 600rpm) and once the engine's up to temperature, the traction control light comes on after a few seconds of idling (ie the first time we stop at lights or a junction). Turn off ignition and back on again and all is fine till next time. The diagnostic computer is showing a problem with the air intake, but nothing more specific. Garage suggests it might be because the non-OEM throttle housing just isn't communicating perfectly with whatever it needs to communicate with (bear with me, I have no technical knowledge!), and that it'll be something to live with. He's reluctant to send it back for a replacement as he'll have to stump up the bill if it's tested and found to be fine. Where do I go from here? Would a Skoda/VW garage have more-specific diagnostic equipment to better isolate the problem? I'm not jumping at that immediately as not wanting to throw too much good money after bad on a car that is ageing. But if it's what's needed, then so be it. Any other ideas, either on the problem or getting better diagnostics? Thank you!