04 Cayenne S turn signal light issue
 

Driver side turn signal doesn’t work. Replaced the bulb the first time it happened and now nothing. Replaced the socket through our host but still no luck. Any ideas why? Should I get the harness now?

I have the same problem, the part of the light where harness plugs in has deteriorated, so you don get a connection.

I've seen the issue being the headlight assembly receiver contact interface. (lack of complete interface)

Essentially the receiver plastic warps/distorts and one or two signal lights don't work.

Easy diagnostic is (blinker on) to reach behind while pushing the headlight assembly back into the receiver.