2006 SCION TC

Typical onset: 80,000-150,000 mi

Symptoms: blue smoke on startup or acceleration, frequent low oil warnings, spark plug fouling, eventual engine knock or failure if oil runs dry

Fix: Toyota issued a TSB (ZE7) for piston ring redesign but many engines fail anyway. Proper fix requires engine rebuild with updated pistons and rings (12-16 hours labor) or short block replacement (14-18 hours). Many owners run it on high-mileage oil and check weekly until catastrophic failure.

Estimated cost: $3,500-5,500

Typical onset: 60,000-120,000 mi

Symptoms: water leaking into cabin at A-pillars or headliner, moonroof moves slowly or stops mid-travel, clicking or grinding noises when operating, mildew smell in interior

Fix: Drain tubes clog with debris causing water intrusion; requires clearing tubes with compressed air or flexible brush (0.5-1 hour). Track binding needs cleaning, re-greasing, and often cable replacement (2-3 hours). Persistent issues may need full regulator assembly.

Estimated cost: $150-800

Typical onset: 100,000-150,000 mi

Symptoms: transmission fluid puddles under car, low fluid level on dipstick, harsh shifting when fluid gets low, pink or red fluid visible near radiator area

Fix: Steel cooler lines rust through where they pass frame rails or connect to radiator. Replacement requires new lines and fittings, plus fluid flush (2-3 hours labor). Inspect closely during any transmission service.

Estimated cost: $300-600

Typical onset: 90,000-140,000 mi

Symptoms: loud rattling from engine for 2-5 seconds on cold start, noise disappears once oil pressure builds, no performance loss or check engine light

Fix: VVT-i cam gear develops play due to worn lock pin or oil feed issues. Technically requires timing cover removal and gear replacement (4-6 hours), but many live with the noise if oil changes are kept current. Does not typically lead to failure.

Estimated cost: $600-1,200

Typical onset: 80,000-130,000 mi

Symptoms: clunking when shifting from park to drive, excessive engine movement visible from engine bay, vibration at idle that worsens with AC on, harsh engagement into gear

Fix: Hydraulic mounts wear and tear rubber, especially the front engine mount and rear transmission mount. Typically replace all three mounts together (2.5-3.5 hours labor). Aftermarket polyurethane upgrades available but increase NVH.

Estimated cost: $400-700

Typical onset: 70,000-110,000 mi

Symptoms: check engine light P0441 or P0446, fuel smell near rear of car, difficulty filling gas tank (pump clicks off repeatedly), failed emissions test

Fix: Charcoal canister vent valve sticks or canister itself saturates. Diagnosis requires smoke test (0.5 hour). Valve replacement is straightforward (0.8 hour), full canister replacement more involved (1.5-2 hours). Often misdiagnosed as gas cap.

Estimated cost: $200-500