2009 AUDI TTS

Typical onset: 60,000-120,000 mi

Symptoms: Sudden loss of compression in one or more cylinders, Rough idle, misfires, loss of power, Metal debris in oil, often discovered during oil change, Can be catastrophic — chunks of piston break off and destroy cylinder walls

Fix: This is THE failure mode for early EA113 engines. Piston ring lands crack and fail, sending debris through the engine. Requires complete engine rebuild or replacement. Most techs recommend a used low-mileage engine swap over rebuild due to labor costs. Expect 18-25 hours labor for removal, teardown, and installation. Many shops will not rebuild these — too risky.

Estimated cost: $5,000-9,000

Typical onset: 80,000-120,000 mi

Symptoms: Harsh or delayed shifts, especially 2nd to 3rd, Clunking into reverse, Transmission fault codes, limp mode, Loss of odd or even gears completely

Fix: The mechatronics unit (valve body with embedded TCU) is a known wear item on 6-speed DSG. Solenoids, TCU internal faults, or wiring corrosion. Audi TSB addressed some software updates but hardware failure is common. Unit must be removed, repaired/replaced, and adapted. 6-8 hours labor. Remanufactured units are common; new from Audi is eye-watering.

Estimated cost: $2,800-4,500

Typical onset: 70,000-110,000 mi

Symptoms: Transmission overheating warnings, Coolant leaks at front of engine bay, Transmission fluid in coolant reservoir or vice versa (if internal leak), Hard shifting when transmission is hot

Fix: The DSG oil cooler is integrated into the main coolant system and tends to leak externally or internally. External leaks are messy but manageable. Internal leaks contaminate coolant and trans fluid — catastrophic for the DSG if not caught early. Replacement involves dropping subframe or significant disassembly. 4-6 hours labor depending on approach.

Estimated cost: $800-1,400

Typical onset: 90,000-140,000 mi

Symptoms: Cold-start rattle for 2-3 seconds that worsens over time, Check engine light with cam/crank correlation codes, Metallic rattling from front of engine, If chain jumps timing: bent valves, no-start

Fix: EA113 tensioner uses a ratcheting design that can fail, allowing slack in the timing chain. Early catch means tensioner and guides replacement (~8-10 hours). If chain has jumped, add valve head work or full engine rebuild. This is a 'replace before it fails' item at high mileage with any noise present.

Estimated cost: $1,200-2,200

Typical onset: 50,000-90,000 mi

Symptoms: Rough idle, hesitation on acceleration, Oil consumption increase, Hissing or whistling from engine bay (PCV valve diaphragm failure), Check engine light for lean/rich codes or misfires

Fix: Direct-injection engines accumulate carbon on intake valves; PCV system failures accelerate this and cause oil burning. Walnut blasting intake valves is the proper fix (4-5 hours), plus PCV valve and breather hose replacement. Some techs combine with timing service for efficiency. Preventive walnut blasting every 60k-80k miles is wise.

Estimated cost: $600-1,100

Typical onset: 60,000-100,000 mi

Symptoms: Clunking on shifts, especially 1st to 2nd or reverse engagement, Vibration through cabin at idle in gear, Excessive driveline movement visible when rocking car in gear

Fix: The dogbone-style transmission mount is a wear item, especially on hard-driven TTS models. Fluid-filled bushings tear and leak. Aftermarket options (street or track density) are common upgrades. Simple job: 1-1.5 hours labor. Often done alongside engine mounts if all are original.

Estimated cost: $250-450

Typical onset: 40,000-80,000 mi

Symptoms: Metallic ticking from top of engine, Fuel system codes, rough running under load, Metal shavings in oil (if follower has disintegrated), Loss of power, long crank times

Fix: The cam follower (bucket tappet) that drives the HPFP can wear through, damaging the camshaft lobe. Inspect every 20k-30k miles; replacement is cheap insurance (~1 hour labor, $50 part). If camshaft is scored, add camshaft replacement (6-8 hours total). Audi revised the follower design; always use updated part.

Estimated cost: $150-300 (follower only), $1,200-1,800 (if cam damaged)