I have recently had a new DPF fitted and now looking at filling up the dpf fluid as well. My friend whos doing this for me said I also need a 'FUEL TANK CAP SENSOR' / 'FUEL FILLER CAP SENSOR'.
Can anyone please shed any light on what this sensor actually is. Im normally good at looking on ebay etc for parts but cant find one anywhere. Im sure theres a proper name for it. I guess its to do with the dpf system
Please help - pics etc of what this sensor looks like