Rear doors will not open with key for my vw golf

The rear door lock actuator has failed in the door locking unit this is a common problem you can manually unlock the door to replace the latch if you didn't have the deadlocking on if you cant try pressing the locking button twice so when the car is locked the flashing red light is not blinking ie off on the drivers. Doing this usually causes the faulty lock to release the dead locking so you can pull the inside handle to unlock the door.

Sound like different problems. In the matter of your rear passenger door, you may have a loose or broken cable which connects the handle to the release mechanism.
As for the driver door, you may have a bad cylinder or complete door door latch.

you might have hit hard to close the door. open door pad n try to open the gate

This worked for me on 2008 Mk5 Golf, after the rear passenger door would not open fro outside or inside.

Hold the inside door latch open and keep it extended, then with the key fob open and close the door locks (still holding the inside latch open). Keep locking and unlocking the door, then it made a kluck and it released.

Before you take the inner door panel apart try to spray an oil like WD40 into the door latch mechanism & Open & close many times. The return spring for the latch has stuck and it needs some waking up. Getting then inner panel off does not help that much in access.

Mine is doing the exact same.

Have two solutions, will try it later today:

1. Unlock with remote tnen lock with key and then unlock with key.
2. Might be a power problem, check that batery is good.

Theres a video of how to open your mk4 car door with the child lock on, on youtube.

i had the same problem. After checking the window motor was not the problem i then checked the wiring harnes in the door. I beeped out all the connectors to make sure there were no broken wires and cleaned up all the contacts. The main connector looked quite corroded. I sprayed all the connectors with rust check and reassembled. The window is working fine now

there will be a screw behind the rubber this holds the handle in., if the door has not been used much, greaseing the mechanism may solve this

If this is a late model polo[2000 upwards].The lock is probably in "safe" mode.Try pressing your remote[lock and unlock] alternatly,while trying to open the door