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B6 Sedan · Avant · Cabrio
Audi A4 · Sedan · Avant · Cabrio · 2000–2006
B6 brought the 4.2 V8 S4 and a much stiffer shell.
Production run
2000–2006
Engines covered
5
Avg. part price
—
19902026
Interactive systems map
Inspect the B6
Tap a hotspot to inspect that system
Systems map
Where it goes wrong
Each numbered hotspot counts the documented failure points in that area. Select one to see the specifics for this chassis and engine.
Failure points by system
Engine6
Intake1
Fuel2
Exhaust1
Documented issues per engine
51.8T
4ASN
44.2 V8
41.9 TDI
52.0 TDI
Known weak points
What breaks on the B6
Timing belt interval is criticalDiagnose →Oil sludge on neglected 1.8T (small oil pickup)Diagnose →Timing chain tensioners at the rearDiagnose →Oil consumptionDiagnose →Timing chain tensioners (front-of-engine job)Diagnose →Carbon buildup on FSI versionsDiagnose →PD injector seals and loomDiagnose →Cam wearDiagnose →PD injector loom and cam wear (PD era)Diagnose →DPF cloggingDiagnose →
Guides & playbooks
B6 playbooks
Maintenance scheduleGive me a mileage-based maintenance schedule for a Audi A4 B6, including the items the factory schedule skips.Buyer's inspectionI'm inspecting a used Audi A4 B6. What exactly should I check, test drive and look for underneath?Build planPlan a staged performance build for a Audi A4 B6 that stays reliable as a daily driver.Fault code lookupI have a fault code on my Audi A4 B6. Walk me through what it means and how to confirm the cause.
Fits your B6
Parts & tools
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