my son has a 2000 range rover hse we put a new ds front door actuator and stills locks and unlock by their self what can i check next thanks for any info and is there any front light conversion to put the newer style light on a 2000 ranger rover

 

It could be the passenger side actuator triggering it to lock and unlock.

 

If you search around the internet you will find sites that discuss the updated headlights. Many of them are in the UK though and the parts are extremely expensive.