Noks1084

adblue filler cap suddenly started leaking Si I bought a new filler cap

that was a few months ago and I seem to remember there was a rubber o ring on the neck end

but I can’t find any photos of anyone else’s v class filler neck to see if mines missing a gasket or seal ?

when I twist the blue cap (which seems the correct diameter) on it clicks in to place but it’s still loose it’s not a snug fit as if inside the cap needs a rubber washer ?

its leaking ad blue and I think it’s letting air in crystallising the ad blue and I’m getting ad blue error codes

thanks
Neil