997 Battery Blues: Warning Signs & Mechanic Search 911

Hey there, I had a similar issue with my '08 Porsche Cayman S last year. The symptoms were exactly what you're describing, flickering lights and struggling to start, especially on cold mornings. Initially thought it was just the battery, but my mechanic diagnosed it as a faulty battery sensor microprocessor. The sensor wasn't correctly monitoring the battery's charge state, causing all sorts of electrical gremlins. It's definitely not something you want to ignore, if left unchecked, it can leave you stranded somewhere. In my case, they had to replace the entire sensor unit and recalibrate the system. The job took about half a day at the shop. Based on what you're describing, it really sounds like the same issue. You'll want a Porsche specialist for this one, they'll have the right diagnostic tools and know exactly where to look. It's not the most complex repair, but it needs someone who knows these cars well. Hope this helps. Good luck with the fix!

Thanks a lot for sharing your experience! This is super helpful as it sounds exactly like what I'm dealing with. Really good to know it was the battery sensor microprocessor in your case. Do you remember roughly how much you ended up paying for the whole repair? Also, has everything been running smoothly since the fix, or have you noticed any other electrical quirks?

Hey again! Happy to give you an update! Since getting the battery sensor microprocessor replaced on my Cayman S, it's been running like a dream, no more electrical gremlins whatsoever! The total bill came to 315€, which included parts and labor. Honestly, while it wasn't cheap, it was totally worth it to have the issue properly sorted. The lights are now steady as a rock, and the car starts up perfectly every time, even on those chilly mornings when it used to struggle. It's such a relief not having to worry about getting stranded somewhere! Been about a year now since the fix, and I haven't seen any other electrical issues pop up. Really glad I could help point you in the right direction with your 997. These Porsches can be tricky sometimes, but once you get the right diagnosis and fix, they're solid machines. Let me know how it goes with yours!

Hey, just wanted to give you all an update on my 997 situation! Finally got it sorted at a Porsche specialist I found through another. You were spot on, it was indeed the battery sensor microprocessor causing all the trouble. The whole repair set me back about 380€, a bit more than what you paid, but honestly, it was worth every penny. The mechanic was super professional and even showed me the faulty part. Got it done in about 4 hours, and the difference is like night and day! The lights are rock solid now, and the car fires up instantly every time. Such a relief not having to worry about whether it'll start or not! Been about two weeks since the fix, and everything's running perfectly. Really appreciate everyone's help here, especially your detailed experience with your Cayman S. It gave me the confidence to get it checked out properly instead of just hoping it would fix itself. These cars might be temperamental sometimes, but when they're running right, there's nothing better! Thanks again, everyone! Case closed on this electrical gremlin!