2009 SUBARU LEGACY GT

Typical onset: 60,000-120,000 mi

Symptoms: Misfires on cylinder 4, sometimes 2, Loss of compression, rough idle, white smoke, CEL for multiple misfires or lean codes, Knock sensor activity, audible detonation under boost

Fix: Full short-block replacement or engine rebuild required. Expect 18-24 hours labor for a used JDM motor swap, 25-35 hours for full rebuild with forged pistons. Root cause: aggressive ignition timing maps, poor fuel quality, or running sustained high boost on stock tune.

Estimated cost: $4,500-8,500

Typical onset: 80,000-140,000 mi

Symptoms: Turbo whine or scream under boost, Oil smoke from exhaust on deceleration, Loss of boost pressure, limp mode, Eventual turbo seizure if ignored

Fix: The banjo bolt feeding oil to the turbo has a tiny mesh filter that clogs with carbon and sludge. Remove, clean, or replace the banjo bolt and filter (~0.5 hours). If turbo already damaged, replacement needed (4-6 hours labor). Prevent with 3,000-mile Rotella T6 changes.

Estimated cost: $50-2,200

Typical onset: 70,000-110,000 mi

Symptoms: Harsh or delayed shifts, especially when hot, Transmission slipping under load, Burned ATF smell, dark fluid, Torque converter shudder between 40-50 mph

Fix: The OEM transmission cooler is undersized and the fluid degrades quickly. External cooler install is a 2-hour job and mandatory preventive mod. If internal damage already occurred, expect valve body replacement (8-10 hours) or full rebuild (15-20 hours). Change fluid every 30k miles religiously.

Estimated cost: $300-4,800

Typical onset: 100,000-150,000 mi

Symptoms: Oil residue around head/block mating surface, Burning oil smell from engine bay, Slight oil consumption without coolant mixing, Not the catastrophic NA EJ25 internal failure—just seepage

Fix: Turbo EJ255s rarely blow head gaskets internally like the NA versions, but external seepage is common. Requires engine-out service for proper access: 12-16 hours labor. Use multi-layer steel (MLS) gaskets and ARP studs. Factor in timing belt, water pump, all seals while you're in there.

Estimated cost: $2,500-3,800

Typical onset: 60,000-100,000 mi

Symptoms: Clunking on hard acceleration or deceleration, Excessive engine rock when shifting, Vibration at idle in drive, Shifter slop in manual transmission models

Fix: The pitch stop mount (transmission mount) fails first, allowing excessive drivetrain movement. Replacement is 1.5-2 hours labor. Upgrade to stiffer aftermarket mounts if you drive aggressively; OEM replacements will fail again in 50k miles.

Estimated cost: $300-600

Typical onset: 90,000-130,000 mi

Symptoms: P0011/P0021 codes (cam timing over-advanced), Loud ticking or tapping from valve covers, worse cold, Rough idle, hesitation on throttle tip-in, Check engine light with cam position sensor correlation codes

Fix: AVCS solenoids stick due to sludge buildup; replacement is 2-3 hours. Lifter tick from collapsed hydraulic lash adjusters requires valve cover removal, lifter replacement (all 16 recommended), 6-8 hours labor. Use quality oil and change it often—this is a maintenance-induced problem.

Estimated cost: $400-1,800