I have the same problem with a Peugeot 3008 from 2011.
I have cut the cable inside the left side hing to run some tests. And I connected the cut wires at this point with two new bulb holders. But there is no light yet. I still get the error message "parking light broken" on the display. The green ground wire seems to make contact to other ground points of the car.
I think the problem is a broken positive wire between the hinge and the connector in the trunk. Little problem is that the connector plug is hidden in the trunk at the left side, behind the plastic panel. I have to remove this panel to get access to the connectors. I don't want to break other stuff when I remove the panel.
I also want to replace the bulb holders and my understanding is to remove the rubber band on top of the lower tailgate, to get access to the 5 screws. And remove two more screws and then open the clips at the bottom. It is annoying the bulb holders are blocked with a plastic strip and you have to open the whole lower tailgate.
If there is no broken wire, the problem could be in the main computer.
If there are more people who have fixed this problem themselves, please share your experience. On the internet there is no proper information to be found on this subject.
I think a workaround could be to connect a new 12 volt wire from the left rear light to the license plate bulb holders, to feed them. If the computer accepts the higher resistance with more light bulbs to feed.
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