2015 AUDI RS5

Typical onset: 40,000-80,000 mi

Symptoms: Rough idle, especially cold start, Misfires on multiple cylinders (P0300-P0308 codes), Significant loss of power and throttle response, Increased fuel consumption

Fix: Direct-injection engines get no fuel wash on intake valves. Requires walnut blasting all 8 cylinders with intake manifold removal. 6-8 hours labor for thorough cleaning.

Estimated cost: $800-1,400

Typical onset: 60,000-120,000 mi

Symptoms: Knocking or ticking noise from bottom end, especially on cold start, Metallic rattling that increases with RPM, Low oil pressure warning, Metal shavings in oil during changes

Fix: The 4.2 FSI has undersized rod bearings that wear prematurely, especially with extended oil intervals or track use. Once knocked, you're looking at engine-out teardown, new bearings, crank polishing—if caught early. Most cases need complete short block or used engine swap. 30-40 hours labor minimum for rebuild.

Estimated cost: $12,000-20,000

Typical onset: 70,000-110,000 mi

Symptoms: Transmission overheating warnings on dash, Coolant leaking from transmission area, Harsh or delayed shifts when hot, Limp mode activation

Fix: The S-Tronic dual-clutch has an integrated oil cooler that cracks or the thermostat valve fails. Requires dropping subframe for access. 8-10 hours labor plus fluid refill and adaptation.

Estimated cost: $2,500-3,800

Typical onset: 50,000-90,000 mi

Symptoms: Clunking during acceleration or deceleration, Vibration felt through shifter and center console, Excessive driveline movement visible when revving in park

Fix: The hydraulic transmission mounts wear out and collapse, especially with spirited driving. Replace both left and right mounts. 3-4 hours labor.

Estimated cost: $800-1,200

Typical onset: 80,000-130,000 mi

Symptoms: Long cranking before start, Rough running and hesitation under load, Fuel pressure fault codes (P0087, P0089), Check engine light with lean codes

Fix: Direct-injection fuel system runs insanely high pressure (2,200+ psi). HPFP cam follower wears, pump fails, or injectors clog/leak. Pump is camshaft-driven and requires partial timing cover removal. 6-8 hours for pump, 4-5 per injector.

Estimated cost: $1,800-3,500

Typical onset: 60,000-100,000 mi

Symptoms: Coolant smell in cabin or under hood, Visible coolant weeping from front of engine, Low coolant warnings, Overheating in extreme cases

Fix: Plastic thermostat housing and water pump seals degrade. Water pump is buried behind timing cover—if you're doing it, do timing chain guides and tensioners at same time (they're marginal by 80k). Pump alone: 8-10 hours. Full timing service: 16-20 hours.

Estimated cost: $1,500-2,800