Connect the black cable of the multimeter to negative terminal of the battery, and the red cable to the positive terminal. The voltage should be between 13.5 and 14.8 volts with the engine running. Switch on the accessories in your Astra, for example, headlights, AC fan at full speed, and interior lights. 1.6 Vauxhall astra exclusive 2010 model Cooling fan running all the time. Even when engine cold. Show More. Diesel 2015 I keep having the Engine warning light come on on the dash it says check emissions. (symbol looks like an engine profile) has started to stay on, then on the next journey will stay off and then reappear. 4. Spark Plugs or Ignition Coils. Another very common reason the check engine light comes on is when there is an issue with one of your spark plugs or ignition coils. Things may not be firing correctly, which can cause engine performance loss and the check engine light is letting you know that there is a problem. 5. Check Engine Light Stays On: When the check engine light remains illuminated on your vehicle's dashboard, it signifies that the onboard diagnostic system has detected a problem. This could range from a loose gas cap to a more serious issue like a malfunctioning sensor or catalytic converter. It's important to have the cause of the check As Rich says, it's a CIM fault. Part of the whole horn/headlights/dimmer switch/etc problems. I've had this happen twice, apparently people have got a CIM update from Vauxhall (Around £70) and thats fixed it, but personally I'd check your left hand steering controls work properly at max brightness with the headlights on, and the horn works with headlights on, else, you may get a new CIM due Sep 30, 2013. #13. Opel Astra 2001 coolant warning light. spiderz said: That sounds like a electrical issue. Sensor wire shorting out to somewhere. I took the car to an electrician. He suspected g2ceXj.

opel astra engine light stays on