I only know this because I researched it when my drivers door did the same.
Does it feel when you pull the handle, there is no resistance at all?
Like really loose pulling out with no engagement??
A quick bang and all is well.
That was 3 years ago with no repeat issues. Lol
Not a tap as such give it a firm thump.
The mechanism sticks open you see, you are just giving it a slight shock to reset it.
Try a thump locked, then try outer handle, and then a thump unlocked then try the handle.
It's all very technical lol
Sorry I don't have the part number because the above fixed mine so didn't have to go that route
Like Chez says the contacts and motor brushes get dirty and the whole mechanism jams up.
They're pretty simple to take apart, clean, and put back together for a free fix.
TPS sell the mechs for £120 ish + VAT or you can get copies very cheaply on eBay but they aren't always up to spec
There are many iterations of the locking mech but the basic part code for the front is 8J1 837 01 and then 5 (nearside/passenger on RHD) and A, B, C, D, E or F (try and get the latest revision "F" if you buy brand new)
I've got the same issue. My drivers rear door just clicks when unlocking from fob & won't open from outside. I replaced both rear locks last year before mot as it would have failed. I got another lock from supplier as they came with 2 year warranty but 2nd one clicks also.
I have got fault codes but they are in my diag machine which is at work at the moment but i think it had 3 errors & i think 2 of them were earthing issues.
Hi, had exactly the same issue on the drivers door. Stripped the whole assembly as posted on a different forum, cleaned up brushes ect and works like a charm now. Took a little while but didn't cost a penny.