Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

When i bought the car i noticed the rear de mister not working. Once i looked into this the cable had been snipped from car into the boot. I jointed the cables and the rear demister started working. Once i turned the engine off and started back up and put the demister on the engine management light came on the demister still worked tho. Disconnected the cables started car again engine management light off. Any ideas?

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I've never heard of it happening before but it's obviously why the wires were snipped

You'd need to take it to an automotive electrician