Hi - first post! My Astra is a 3 year old 1.7cdti sxi, the MK5. Lovely car and nearly 50mpg.
No problems with it until today and it's possible I have caused this one but don't know what to look for. Everything obvious like plugs and wires I have checked and checked again and I don't have a code reader yet.
It's Sunday tomorrow, everywhere is shut and I'm about to cry!
I changed the air filter today for a new one. Simple changeover, lifted the air box lid, removed the old one, give the box a bit of a hoovering to get shut of all the muck and put the new one in. I didn't unplug any connectors.
I went for a drive and did a bit of town driving, then 70 down a dual carriageway, then back to 30mph. Within a few mins of going back to 30 the spanner/engine light come on. I stopped the car, but when I switched the engine back on the light was off and remained off during driving.
Earlier tonight I was out again and driving at 30/40 nothing happened. After taking the car at 70 and slowing to 30 again the light was on within minutes.
I've never had this before today. No other lights come on and there is enough oil and water. No black smoke, strange noises or even usage of oil. The car has 24,500miles on it and serviced from new.
Is there anything really obvious it could be? There is a plastic piece of pipe with a connector about 4inches along the rubber hose on the outlet of the air filter housing. Could it be whatever is inside that?
I can see a major ECU problem and bank loan coming on.