Diagnostics & Mystery ProblemsDIYCommunity Starter

2023 Audi S5 — vibration under acceleration but not while coasting

RotorWrench276Community StarterJun 30, 20262023 Audi S5 SportbackNew Jersey
The car is smooth at the same road speed when I lift off, but under moderate acceleration I can feel a vibration through the floor. What would you inspect first to separate axle/driveline issues from an engine mount?
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12 replies

TireNomadCommunity StarterCommunity StarterJun 30, 2026permalink
I'd want a measurement, not a hunch. Loaded-suspension checks on the 2023 Audi S5 catch play that a wheels-hanging inspection misses. That's the branch I'd chase this week. I'd want a dollar figure or a measured spec, not 'should be fine.' Not trying to scare you — just skip the expensive first guess. I'd rather pay for diagnosis than a second guess-repair.
ColdStartBuilder211Community StarterCommunity StarterJul 1, 2026permalink
Not convinced that's the whole story. If a shop can't duplicate it on the 2023 Audi S5, bring a video plus freeze-frame data, not just a story. You'll know quickly if you're on the wrong tree. No need to make it theatrical. Your commute and mine probably aren't the same, but the test still applies. I'm keeping receipts and dates in one folder.
WeekendRoadie414Community StarterCommunity StarterJun 30, 2026permalink
This is usually cheaper to test than to guess. If a shop can't duplicate it on the 2023 Audi S5, bring a video plus freeze-frame data, not just a story. If the cheap test changes it, stop and reassess. This is from a 2023 Audi S5 in New Jersey. Verbal 'we'll take care of it' is not a plan. Not driving it hard until I know more.
CleanWrench273Community StarterCommunity StarterJun 30, 2026permalink
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 “vibration under acceleration but not while coasting,” that was the fork that mattered for me. I'd want a dollar figure or a measured spec, not 'should be fine.' If your situation is the opposite, ignore me. This is me being the wet blanket on purpose.
RotorPilot570Community StarterCommunity StarterJul 1, 2026permalink
Not convinced that's the whole story. Write temp, speed, and in-gear vs coast when the 2023 Audi S5 does it — then decide on parts. If the cheap test changes it, stop and reassess. If they can't show the line item, I assume it's hiding. Next check is the cheap one I can do in a driveway.
EVMomCommunity StarterCommunity StarterJun 30, 2026permalink
Log the conditions before you spend. Move a coil or plug on the 2023 Audi S5 if it's cylinder-specific and see whether the code follows. If the cheap test changes it, stop and reassess. On “vibration under acceleration but not while coasting,” that was the fork that mattered for me. If they can't show the line item, I assume it's hiding. If your situation is the opposite, ignore me. Parking it somewhere I can hear it better next time.
CleanWrench273Community StarterCommunity StarterJul 1, 2026permalink
Start with the test that can prove you wrong. Get a real battery/charging test on the 2023 Audi S5, not just resting voltage, before blaming a module. Save the big job until that test fails. Run the total, not the monthly, before you commit. I've seen both outcomes, which is why I'd test instead of assume. That's my plan before I call anyone.
CleanWrench273Community StarterCommunity StarterJul 1, 2026permalink
I hear you, though I'd still want a second check. Two 2023 Audi S5s can feel identical and have different causes, so measure before you copy someone else's repair. That's the branch I'd chase this week. Run the total, not the monthly, before you commit. I'd rather be boring and correct. Doing the boring step first on purpose.
TireNomadCommunity StarterCommunity StarterJul 1, 2026permalink
If it were in my driveway, two 2023 Audi S5s 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. This is from a 2023 Audi S5 in New Jersey. Run the total, not the monthly, before you commit. If that fails I'll eat the diagnostic fee.
WrenchDriverCommunity StarterCommunity StarterJul 1, 2026permalink
Ask what changed right before it started. If a shop can't duplicate it on the 2023 Audi S5, bring a video plus freeze-frame data, not just a story. You'll know quickly if you're on the wrong tree. I'd want that in writing, not as a promise. Make the next action something you can finish this week. Next check is the cheap one I can do in a driveway.
RotorMilesCommunity StarterCommunity StarterJul 1, 2026permalink
Ask what changed right before it started. Write temp, speed, and in-gear vs coast when the 2023 Audi S5 does it — then decide on parts. That's the branch I'd chase this week. This is from a 2023 Audi S5 in New Jersey. Time, temperature, and whether it's in gear are the notes that actually help a shop. Not interested in a five-hour wait for a shrug.
ColdStartBuilder211Community StarterCommunity StarterJul 1, 2026permalink
Intermittent stuff lies if you only catch it once. Swap the cheap/easy piece first on the 2023 Audi S5 and see if the fault moves. You'll know quickly if you're on the wrong tree. On “vibration under acceleration but not while coasting,” that was the fork that mattered for me. That's the sequence I'd use. I'm keeping receipts and dates in one folder.
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