2017 Porsche 911 — no crank with full dash power, then it starts later

Start with the test that can prove you wrong. Two 2017 Porsche 911s can feel identical and have different causes, so measure before you copy someone else's repair. You'll know quickly if you're on the wrong tree. I'd want that in writing, not as a promise. Your commute and mine probably aren't the same, but the test still applies. Cold start is when I can actually reproduce it.

If it were in my driveway, swap the cheap/easy piece first on the 2017 Porsche 911 and see if the fault moves. Save the big job until that test fails. I'd want that in writing, not as a promise. I'd sleep better after that step, even if it finds nothing. Doing the boring step first on purpose.

Ask what changed right before it started. Write temp, speed, and in-gear vs coast when the 2017 Porsche 911 does it — then decide on parts. That's the branch I'd chase this week. This is from a 2017 Porsche 911 in Washington DC. When does it actually happen? A day of patience here is cheaper than a wrong part. I'm keeping receipts and dates in one folder.

I'd want a measurement, not a hunch. Write temp, speed, and in-gear vs coast when the 2017 Porsche 911 does it — then decide on parts. Save the big job until that test fails. Keep sale price, fees, and rate as three different conversations. I'd rather be boring and correct. Only after sitting overnight so far.

Log the conditions before you spend. Get a real battery/charging test on the 2017 Porsche 911, not just resting voltage, before blaming a module. You'll know quickly if you're on the wrong tree. On “no crank with full dash power, then,” that was the fork that mattered for me. Do that first. Climate here is different, so treat that as a local data point. Not interested in a five-hour wait for a shrug.