The Vauxhall / Opel Insignia AdBlue warning light flashes yellow indicating the level is low. Refill AdBlue soon to avoid prevention of the engine start. AdBlue is an additive to help reduce toxins in exhaust emissions. The warning light illuminates when approximately 5 liters of AdBlue remain in the tank. 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 Support the channel making a donation at to clean your Air Conditioning: https://www.youtub My 2016 plate Astra 1.4 SRI nav had to go into the dealership yesterday, as last week we were getting hit with seriously bad juddering, loss of power, a flashing engine management light, Auto collision prep unavailable light, service ESC warning message, and flickering internal and external lights. The easiest method to check the alternator is by measuring the voltage at the battery terminals when the engine is running. Start your Astra. 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. The exhaust emmission light is actually the engine managment (ECU) light. The car has gone into "limp home" mode. Depending on the fault, yes damage could be done. If for instance a faulty fuel sensor has triggered the ecu light, the engine could be fed with more fuel, and in turn knacker the catalylic converter. .

opel astra engine light stays on