2016 Audi A4 — conservative tune feels great — what should I log?

Ask what changed right before it started. A pressure test beats staring at a dry driveway if the 2016 Audi A4 is losing coolant with no puddle. Save the big job until that test fails. Just my two cents from doing this recently. Make the next action something you can finish this week. Might be overthinking it, but I'd rather overthink than overspend.

Intermittent stuff lies if you only catch it once. A pressure test beats staring at a dry driveway if the 2016 Audi A4 is losing coolant with no puddle. That's the branch I'd chase this week. On “conservative tune feels great — what should,” that was the fork that mattered for me. Verbal 'we'll take care of it' is not a plan. If that fails I'll eat the diagnostic fee.

Start with the test that can prove you wrong. Swap the cheap/easy piece first on the 2016 Audi A4 and see if the fault moves. If the cheap test changes it, stop and reassess. If they can't show the line item, I assume it's hiding. If this is nothing, great. I want that in data.

If it were in my driveway, write temp, speed, and in-gear vs coast when the 2016 Audi A4 does it — then decide on parts. You'll know quickly if you're on the wrong tree. Happy to compare notes if your setup is different. If that fails I'll eat the diagnostic fee.

Ask what changed right before it started. Move a coil or plug on the 2016 Audi A4 if it's cylinder-specific and see whether the code follows. Don't erase codes until someone who can help has seen them. Just my two cents from doing this recently. I'll update if anything new shows up.