I had a similar issue with my 2013 Porsche Cayenne last year. The symptoms you're describing sound exactly like what I experienced after changing the fuel filter. The ECU started throwing errors, and the engine performance was terrible, rough idle, black smoke, and poor fuel economy. Turned out the fuel pressure sensor wasn't properly connected during the filter replacement, which messed with the fuel-air mixture. My trusted mechanic at the Porsche specialist shop found that the connector was slightly damaged during the filter swap. They had to replace the sensor and recalibrate the fuel system. It wasn't a major repair, but it needed proper diagnostic equipment to identify the exact issue. These symptoms could point to several problems, from sensor issues to actual fuel pressure regulator failure. My recommendation would be to take it to a certified Porsche specialist who can properly diagnose it with the right tools. at European Motors handled my case, he's got deep experience with Porsche fuel systems. I can send you his details if you're in the area.

Thanks that's super helpful! Your experience sounds spot on with what I'm dealing with. Quick question, do you remember roughly how much the repair set you back? Also, has everything been running smoothly since then, or have you noticed any other quirks pop up?

Hey there! Happy to give you an update. After seeing at European Motors, everything's been running like a dream. The total bill came to €45.0, just for fixing the error entry after they sorted out the fuel filter issue. The fuel pressure regulator fault is completely sorted now, and my Cayenne's performing beautifully. To answer your other question, nope, haven't had a single problem since the repair. The black smoke's gone, fuel consumption's back to normal, and the engine's purring like it should. It's been about a year now, and honestly, it feels like a different car. No more stalling or power loss issues at all. If you're still having second thoughts about getting it checked, I'd say just go for it. The peace of mind is worth it, and it's better to sort these things out early before they turn into bigger problems. 's really thorough and won't try to upsell you on stuff you don't need. Let me know if you want his contact details!

Update on my Panamera situation! Just got back from European Motors, and I'm honestly relieved. Took your advice and went to see, what a legend! Turns out it wasn't as bad as I feared. The fuel pressure regulator was acting up because of a loose connection and a bit of dirt buildup. cleaned everything, fixed the connection, and did a quick system reset. Bill came to €380, which was way less than I expected. No more black smoke, engine's running smooth as butter, and my fuel consumption's back to normal. It's like driving a different car now! Really appreciate everyone's help, especially your recommendation. Sometimes it just takes finding the right mechanic who knows what they're doing. Guess I can stop stressing about this now and actually enjoy driving my Porsche again! Thanks again for pointing me in the right direction. If anyone else needs a reliable Porsche mechanic, I can definitely vouch for now!