How do you replace the headlight assembly on a 2010 ford transit?

you can get guide from many sites.. i know few
error codes/ fault codes, wiring diagrams, schematic diagrams, torque specs, engine info, switches functioning, assemble, disassembly, complete refurbish, repair, installation every single thing is covered

Here's the link and I'm sure you will get the solution of your problem -

https://www.reliable-store.com/products/2010-ford-transit-workshop-repair-service-manual-pdf-download

https://ibb.co/cWtbC8

Click on the link. This is for ford transit connect.

Please read my notes at the link below.
Do It Yourself Diagnosis and Repair

2010 Ford Transit Workshop Repair Service Manual PDF Download

for the easy solution download the pdf file

CRANKSHAFT SENSOR NEED TO BE REPLACED

IMPORTANT NOTE 44 mm nut flange = 300 Nm 51 mm nut flange = 450 Nm

The 2010 Transit Connect headlamp assembly can removed by putting a bottle cap under the lamp to push the rubber bumper down out of the way you must have a Very bright penlight and a10 inch quarter inch extension with socket lock and a 10 mm to get the bolts out under there then you have toCut and bend a piece of plumbers strap to fry the Locking strip out and a piece of bent metal to pull off and pull the flapper out to pull the connection loose for the harness. To install new bolts you need to glue the bolt into the socket with some 1099 contact Bond adhesive it's all pretty easy Once you have done it once but it's a pain in the first time

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These details will help.
Thanks.