I had a similar issue with my 2018 Porsche Cayenne last month. The brake light failure turned out to be more than just a burnt bulb, it was related to the wiring harness near the tailgate hinge that had worn out from repeated opening and closing. Had to take it to a certified Porsche specialist since my regular mechanic wasn't familiar with the specific routing of these wires in Porsche models. The fix involved replacing a section of the wiring harness and updating the light control module. It wasn't a quick fix but definitely needed proper attention as brake lights are critical safety equipment. For your Macan, I'd suggest checking the fuse box first, it's the easiest thing to verify. If that's not it, get it to a certified Porsche tech who can properly diagnose the electrical system. These aren't typically DIY fixes on modern Porsches due to their complex electronics.

Hey thanks for sharing your experience! That's really helpful to know about the wiring harness issue, definitely something I'll have checked out. Just curious, do you remember roughly how much you ended up paying for the whole repair? Also, has everything been working smoothly since then, or have you noticed any other electrical quirks pop up?

Hey there! Just wanted to update you on my Cayenne situation since you asked. Actually, it turned out to be way simpler than the wiring issue I initially thought it was. When I finally took it to the Porsche dealer, they found that the "Brake light signal implausible" warning was just a personal error, something about the way the brake pedal sensor was reading. They fixed it right up, and the best part? Didn't cost me a cent! I'm actually kind of embarrassed I made such a big deal about the wiring harness before getting it properly checked out. The car's been running perfectly since then, no electrical issues at all. Just goes to show it's always worth getting a proper diagnosis before jumping to conclusions! So for your Macan, definitely get it checked out by a Porsche specialist, sometimes what seems like a major problem can turn out to be something really simple. Fingers crossed yours is an easy fix too!

Thanks for the follow-up! You actually made my day with that update. I took your advice and went to a certified Porsche dealer yesterday. Funny enough, my situation was the complete opposite, what I thought was a simple brake light issue turned out to be more complex. The technician found a corroded wiring connection and some moisture damage in the taillight assembly. Cost me about $800 for the repair, parts, and labor, but at least it's fixed properly now. The mechanic also showed me exactly what was wrong, which I really appreciated. Much better experience than my last repair shop visit! The car's running great now, all lights working perfectly. Definitely learned my lesson about going to specialists for these kinds of issues. Sometimes paying a bit more upfront saves money in the long run. Thanks again for pushing me in the right direction with this!