The 2006 TSX is Honda's K24A2 engine in a well-built sedan, but third-gear pop-out in the manual transmission and premature engine block wear are the two dealbreakers that separate good examples from money pits.
Manual Transmission Third Gear Pop-Out / Synchro Failure
Common · high severityTypical onset: 80,000-150,000 mi
Symptoms: Third gear pops out of engagement under load or deceleration, Grinding or difficulty engaging third gear, Notchy shifter feel specifically in third, Gets progressively worse until third becomes unusable
Fix: Transmission removal and rebuild or replacement. Third gear synchro assembly and related components need replacement. 8-12 labor hours for removal, rebuild, reinstall. Many opt for used low-mileage transmission swap instead of rebuild.
Estimated cost: $2,200-3,800
Excessive Oil Consumption / Engine Block Cylinder Wear
Occasional · high severityTypical onset: 100,000-180,000 mi
Symptoms: Burning one quart or more every 1,000 miles, Blue smoke on startup or acceleration, Fouled spark plugs, misfires on cylinder 2 or 3 most common, Low compression readings on affected cylinders
Fix: Caused by cylinder bore wear and ring flutter. Requires engine removal, bore measurement, and either re-sleeve/re-ring or short block replacement. Not fixable with top-end work alone. 20-28 labor hours total for proper repair.
Estimated cost: $4,500-7,000
Power Steering Pump Failure with Reservoir Leak
Common · medium severityTypical onset: 90,000-140,000 mi
Symptoms: Whining noise from pump, especially when cold, Power steering fluid leaking from reservoir or pump body, Intermittent heavy steering, especially at low speeds, Metal shavings visible in reservoir
Fix: Pump and reservoir assembly replacement, system flush. Related NHTSA recall addressed certain hose connections, but pump itself still fails. 2.5-3.5 labor hours including fluid flush and bleeding.
Estimated cost: $600-950
Transmission Oil Cooler Line Corrosion and Leaking
Common · medium severityTypical onset: 100,000-160,000 mi
Symptoms: ATF leaking at cooler line connections near radiator, Visible corrosion on steel lines at bends, Low transmission fluid without obvious external leak, Pink fluid stains on subframe or ground under front of vehicle
Fix: Replace corroded hard lines and possibly radiator-mounted cooler. Lines rust through at bends near subframe. Requires removal of front bumper and some AC line movement. 3-4 labor hours.
Estimated cost: $450-750
Engine Mounts (Especially Rear) Deterioration
Common · low severityTypical onset: 80,000-120,000 mi
Symptoms: Excessive vibration at idle, especially with AC on, Clunk when shifting from reverse to drive, Engine rocks visibly when revved in park, Vibration resonates through shifter and steering wheel
Fix: Rear transmission mount most common failure, but side and front mounts also deteriorate. Each mount 1.5-2.5 labor hours. Recommend replacing all three simultaneously if doing the work.
Estimated cost: $400-800
Front Lower Control Arm Bushings Tear
Occasional · medium severityTypical onset: 90,000-130,000 mi
Symptoms: Clunking over bumps from front suspension, Wandering or vague steering feel, Uneven inner tire wear, Visible cracking in rubber bushing during inspection
Fix: Replace complete control arms as bushings are not serviceable separately on OEM parts. Alignment required after. 2-3 labor hours per side plus alignment.
Estimated cost: $600-1,000
Fantastic driver when healthy, but manual transmission third-gear and oil consumption issues make careful pre-purchase inspection critical—budget $3-5k reserve for either problem.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.