Porsche 991 Nightmare: Multiple Engine Issues Need Help!

Hey there! I have some experience with cars, and I actually had a very similar issue with my 2017 Porsche 718 Cayman last year. The symptoms you're describing are almost identical to what I experienced. My mechanic diagnosed a faulty MAF sensor, and it was causing all those same problems, black smoke, stalling, poor performance, the works. Got it fixed at my local Porsche specialist, cost me about 415€ for the whole job including parts and labor. Car's been running like a charm since then. Before I share more specific details about my repair experience, could you tell me if you're getting any specific error codes? Also, how many miles/km are on your 991? This info would help me give you more relevant advice based on what I learned from my situation.

Thanks for sharing your experience! I'm at 80342 KM and just had my service done recently. The error code I'm getting is P0101, but the weird thing is sometimes it clears itself for a few days before coming back. Has anyone dealt with intermittent MAF sensor issues like this? The symptoms seem to match what you had with your Cayman, but I'm wondering if I should look into other potential causes before jumping straight to replacing the MAF sensor. Your repair costs sound reasonable, did you go with an OEM sensor or aftermarket? Just trying to weigh my options here.

Hey again! Yeah, that P0101 code sounds super familiar, that's exactly what I had with my Cayman. The intermittent nature of the error is actually what made me scratch my head for a while too. Mine would clear up for a few days, especially after disconnecting the battery, but then come right back. I ended up going with an OEM sensor from Porsche because, honestly, I learned my lesson with aftermarket parts on these cars. Initially, I was tempted to save some cash with a cheaper alternative, but my mechanic strongly advised against it. These Porsches can be pretty sensitive to non-OEM parts, especially when it comes to sensors. Given your mileage and the symptoms, I'd say you're dealing with the same issue I had. But here's a quick tip from my experience, before replacing the sensor, have your mechanic check the wiring connections and clean the sensor housing. Sometimes it can just be a connection issue or built-up debris. In my case, we tried cleaning it first, but it turned out the sensor itself was actually failing. Just to give you some peace of mind, since replacing mine, I haven't had a single issue. The car's performance went back to normal, and the fuel economy improved significantly. Feel free to ask anything else, I know how frustrating these intermittent issues can be!

Thanks so much for all the detailed info! This really helps, especially knowing that you dealt with the same intermittent P0101 code. I'll definitely take your advice about checking the connections and cleaning before jumping into a replacement. And you've convinced me about going OEM, not worth risking it with aftermarket parts on a Porsche. I'll get it into the shop next week and have them check everything you mentioned. It's actually really reassuring to hear that fixing the MAF sensor solved all your issues completely. Will update the thread once I get it sorted out. Really appreciate you taking the time to share your experience, it's been super helpful!