2020 AUDI S6

Typical onset: 20,000-60,000 mi

Symptoms: metallic knocking from engine bay at idle, sudden loss of oil pressure warning, engine seizure without prior warning, metal shavings in oil during changes, rough idle that progressively worsens

Fix: Complete engine rebuild or replacement required. Rod bearings and/or piston rings fail prematurely, often taking out cylinder walls and crankshaft. This is a known issue with early EA839 engines. Expect 40-60 labor hours for full engine-out rebuild or replacement. Some cases covered under warranty extension, but out-of-warranty owners face nightmare bills.

Estimated cost: $18,000-35,000

Typical onset: 30,000-70,000 mi

Symptoms: transmission fluid in coolant (milky pink coolant), transmission overheating warnings, harsh shifting or slipping, coolant level dropping without visible leaks, check engine light with transmission temp codes

Fix: The ZF8 transmission oil cooler integrated into the radiator fails, allowing cross-contamination between coolant and ATF. Requires replacement of radiator assembly, complete transmission fluid flush (sometimes multiple flushes), and possibly internal transmission components if contamination was severe. 8-12 labor hours depending on contamination extent.

Estimated cost: $2,500-6,500

Typical onset: 40,000-80,000 mi

Symptoms: clunking from rear end during acceleration/deceleration, vibration under hard acceleration, visible cracks in differential carrier housing, whining noise from rear differential, fluid leaks from rear diff area

Fix: The rear axle carrier housing can develop stress cracks, particularly on vehicles driven hard or with performance driving. This is recall-addressed on some VINs (NHTSA recall) but not all. Requires complete rear differential assembly replacement. 6-10 labor hours with proper alignment afterwards.

Estimated cost: $4,000-7,000

Symptoms: intermittent or complete camera failure, foggy/condensation in camera lens, no image when in reverse, parking assist malfunction warnings, water visible inside trunk lid

Fix: Backup camera seal fails allowing water intrusion. Common enough that NHTSA issued recall for some units. Camera module replacement required, typically 1-2 labor hours. Check if your VIN is covered under recall before paying out of pocket.

Estimated cost: $450-900

Typical onset: 40,000-90,000 mi

Symptoms: long cranking before start especially when warm, rough idle and misfires under load, loss of power during acceleration, fuel pressure fault codes P0087/P0088, metallic ticking from engine bay

Fix: Continental HPFP used on EA839 engines can fail prematurely, scattering metal debris through the fuel system. Requires HPFP replacement plus complete fuel system inspection for debris. If metal contamination severe, injectors and fuel rails also need replacement. 4-8 labor hours depending on extent of contamination.

Estimated cost: $2,000-5,500

Typical onset: 50,000-90,000 mi

Symptoms: excessive drivetrain movement on throttle tip-in, clunk when shifting from park to drive, vibration at idle that worsens with AC on, visible torn rubber on transmission mount, harsh shifts particularly 1st to 2nd

Fix: The hydraulic transmission mount wears prematurely, especially with spirited driving. Relatively straightforward replacement but requires proper support of transmission. 2-3 labor hours. Do both motor and transmission mounts together if one has failed.

Estimated cost: $800-1,400

Symptoms: fuel gauge reading empty when tank is full, intermittent range calculations jumping wildly, fuel warning light coming on with plenty of fuel, gauge stuck at one level regardless of fuel added, range display showing implausible numbers

Fix: Fuel level sending unit in tank develops electrical issues. Subject to NHTSA recall on certain VINs. Requires fuel tank drop and sending unit replacement. 3-4 labor hours. Check recall status before paying for repair.

Estimated cost: $600-1,200