2011 HONDA CIVIC SI

Typical onset: 60,000-100,000 mi

Symptoms: Grinding into third or fourth gear, especially when cold, Difficulty downshifting into third under deceleration, Eventual lockout from third or fourth gear entirely

Fix: Transmission removal and rebuild with OEM synchro rings and sleeve replacement. 8-12 hours labor depending on shop familiarity. Some techs will replace all synchros while it's apart. Clutch replacement often done simultaneously since you're already in there.

Estimated cost: $2,200-3,800

Typical onset: 80,000-150,000 mi

Symptoms: Burning 1+ quart of oil per 1,000 miles, Blue smoke on startup or hard acceleration, Fouled spark plugs (cylinder 2 and 3 most common), Check engine light with P0301-P0304 misfire codes

Fix: Honda extended warranty covered this until 8 years/125k miles, but most 2011s are past that now. Proper fix is piston ring replacement or short block swap. Piston ring job alone: 16-20 hours. Short block replacement: 18-24 hours. Many owners try catch cans or thicker oil as bandaids.

Estimated cost: $3,500-6,500

Typical onset: 90,000-130,000 mi

Symptoms: Transmission fluid puddle under engine bay, driver side, Low fluid level causing notchy shifting, Visible corrosion or seepage at cooler line fittings near radiator

Fix: Replace both hard lines and rubber sections as a set. Lines run along frame rail and require removal of undertray and some exhaust heat shield work. 2-3 hours labor plus fluid flush.

Estimated cost: $400-700

Typical onset: 70,000-110,000 mi

Symptoms: Excessive engine movement during launches or hard shifts, Clunking noise when letting off throttle or engaging clutch, Vibration transmitted through shifter at idle

Fix: Replace driver-side hydraulic mount. Transmission side mount often fails around the same time. 1.5-2 hours per mount. Many owners upgrade to stiffer aftermarket mounts, which increases NVH but improves shift feel.

Estimated cost: $250-450

Typical onset: 80,000-120,000 mi

Symptoms: Clunking over bumps from front suspension, Vague or wandering steering feel, Uneven tire wear on inside edge of front tires

Fix: Replace both lower control arms as assemblies (bushings are not serviceable separately on OEM parts). Alignment required after replacement. 2-3 hours labor total.

Estimated cost: $450-750

Typical onset: 100,000-140,000 mi

Symptoms: Clutch pedal sinks to floor and stays there, Soft or spongy pedal feel that doesn't improve with bleeding, Visible fluid leak at firewall where master mounts

Fix: Replace clutch master cylinder and bleed system. Internal seal failure is common. 2-2.5 hours labor. Replace slave cylinder at same time if it's original (adds 1 hour since trans stays in car).

Estimated cost: $350-600