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C5 Sedan · Avant · Allroad
Audi A6 · Sedan · Avant · Allroad · 1997–2004
Allroad and the twin-turbo RS6 came from this generation.
Production run
1997–2004
Engines covered
6
Avg. part price
—
19902026
Interactive systems map
Inspect the C5
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
Engine7
Cooling2
Intake2
Fuel1
Exhaust1
Documented issues per engine
51.8T
4ASN
4AHA
44.2 V8
41.9 TDI
53.0 TDI
Known weak points
What breaks on the C5
Timing belt interval is criticalDiagnose →Oil sludge on neglected 1.8T (small oil pickup)Diagnose →Timing chain tensioners at the rearDiagnose →Oil consumptionDiagnose →Timing belt and tensionerDiagnose →Coolant seepage at the blockDiagnose →Timing chain tensioners (front-of-engine job)Diagnose →Carbon buildup on FSI versionsDiagnose →PD injector seals and loomDiagnose →Cam wearDiagnose →Swirl flap motorDiagnose →EGR coolerDiagnose →
Guides & playbooks
C5 playbooks
Maintenance scheduleGive me a mileage-based maintenance schedule for a Audi A6 C5, including the items the factory schedule skips.Buyer's inspectionI'm inspecting a used Audi A6 C5. What exactly should I check, test drive and look for underneath?Build planPlan a staged performance build for a Audi A6 C5 that stays reliable as a daily driver.Fault code lookupI have a fault code on my Audi A6 C5. Walk me through what it means and how to confirm the cause.
Fits your C5
Parts & tools
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