Skip to content
CarCareTruth

Coming Soon

Audi A4 B9 (5th Generation)

2017–2025 · B9 · sedan

B9 sits on the MLB Evo platform shared with the Q5 and A5. EA888 Gen 3 2.0L turbo four runs Audi's B-cycle (a variable Miller/Atkinson-style efficiency mode). Virtual Cockpit digital instrument panel optional then standard. The 2020 mid-cycle refresh added a 48V mild-hybrid on most US cars. Reliability is dramatically improved over the B8.

Watch out: Water pump and thermostat housing leaks. Plastic housings crack around 60k-90k miles. A $500 part with a four-hour labor bill.

What your A4 takes

The parts and fluids that fit this generation. Specs we publish are confirmed against two independent sources; the rest fill in as we verify them.

  • Wiper blades24" driver · 20" passenger✓ VerifiedView
  • Key fob batteryCR2032✓ VerifiedView
  • Engine oil0W-20 (5.3 qt)From owner's manualShop
  • CoolantAudi G13 (TL-VW 774 J) · ~10.6 qtFrom owner's manualShop
  • Tire sizeNot catalogued yetFind yours soon
  • Oil filterNot catalogued yetFind yours
  • Engine air filterNot catalogued yetFind yours
  • Cabin air filterNot catalogued yetFind yours
  • Spark plugsNot catalogued yetFind yours soon
  • Headlight bulbsNot catalogued yetFind yours soon
  • BatteryNot catalogued yetFind yours soon
  • Brake fluidNot catalogued yetFind yours soon
  • Transmission fluidNot catalogued yetFind yours soon
  • Tire pressureNot catalogued yetFind yours soon
  • Power steering fluidNot catalogued yetFind yours soon
  • Differential fluidNot catalogued yetFind yours soon
  • Serpentine beltNot catalogued yetFind yours soon
  • Brake padsNot catalogued yetFind yours soon
  • Wheel fitmentNot catalogued yetFind yours soon
  • Brake rotorsNot catalogued yetFind yours soon
  • ThermostatNot catalogued yetFind yours soon
  • A/C refrigerantNot catalogued yetFind yours soon
  • Fuel filterNot catalogued yetFind yours soon

Floor mats

Our top custom-fit pick for the Audi A4 is the WeatherTech Custom Fit FloorLiners 1st & 2nd rows.

Floor mats for the Audi A4 →

Full clubhouse — owner Garage Lineage, common problems, year-by-year notes, and product picks — is on the build list.

← Back to all vehicles