Corsa Check Engine Light Hose Issue

Sounds familiar. I had a similar thing with my Corsa. Check all your vacuum hoses, especially near the throttle body. A vacuum leak can cause all sorts of issues. Is the engine stalling at all?

No stalling, just the check engine light. Was it definitely a hose problem for you, or something else with the air valve itself?

Yeah, it was a split vacuum hose causing a leak. Worth checking them thoroughly, but honestly, with those symptoms, a workshop visit might be best. They'll diagnose it properly.

Thanks for the advice. Took it to the shop; you were right, hose connection from pump to valve was indeed defective. Repair cost 175€. All sorted now.