2023 Audi S5 — no crank with full dash power, then it starts later

If it were in my driveway, capture voltage while the 2023 Audi S5 is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. Write the result down so the next test isn't a repeat of the last one. If that fails I'll eat the diagnostic fee.

This is usually cheaper to test than to guess. Loaded-suspension checks on the 2023 Audi S5 catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. That's the whole play. Checking again after work.

Log the conditions before you spend. Write temp, speed, and in-gear vs coast when the 2023 Audi S5 does it — then decide on parts. Save the big job until that test fails. On “no crank with full dash power, then,” that was the fork that mattered for me. Learned this the expensive way on a previous car. Climate here is different, so treat that as a local data point. Checking again after work.

Intermittent stuff lies if you only catch it once. Get a real battery/charging test on the 2023 Audi S5, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. On “no crank with full dash power, then,” that was the fork that mattered for me. That's the sequence I'd use. Only after sitting overnight so far.

I'd want a measurement, not a hunch. Capture voltage while the 2023 Audi S5 is actually failing — after it restarts you've lost the clue. That's the branch I'd chase this week. That's the sequence I'd use. I'd rather be boring and correct. Doing the boring step first on purpose.