A mate of mine had an add blue error come up on his just out of warranty Motorhome apparently it crystalises and damages the sensor.The new tank with built in sensor was about 800 quid, he got a man out to remove the addblue through a computer program and increase his bhp at the same time. It later passed its Mot with no ill effects.You can see why manufacturers want to lock the ecu, whether we agree or not is a different matter. Em
