The 2007 Focus is generally reliable transportation, but the 4-speed automatic transmission (4F27E) is its Achilles heel, prone to internal failures and cooler line leaks. Manual transmission models fare much better overall.
4F27E Automatic Transmission Internal Failure
Common · high severityTypical onset: 80,000-140,000 mi
Symptoms: Harsh or delayed 2-3 shift, especially when cold, Slipping under acceleration or going into limp mode, Whining or grinding noise from transmission, Metal shavings in fluid during service
Fix: This Mazda-designed 4-speed is notoriously weak. Clutch packs wear prematurely, servos fail, and valve body issues are common. Rebuild runs 12-16 hours labor; used replacements are gambles. Fluid changes every 30k might延long life slightly, but many fail regardless.
Estimated cost: $2,200-3,800
Transmission Oil Cooler Line Corrosion and Leaks
Common · medium severityTypical onset: 70,000-120,000 mi
Symptoms: ATF puddles under engine, typically passenger side, Low transmission fluid level, slipping symptoms follow, Visible corrosion on steel cooler lines near radiator
Fix: Steel cooler lines rust through where they pass along the subframe, especially in salt states. Replace both lines at once (2-3 hours). Don't just patch—the rest will fail within months. Some techs fab stainless replacements for longevity.
Estimated cost: $350-650
Coil Pack and Spark Plug Failure (2.0L Duratec)
Occasional · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Misfire codes (P0300-P0304), rough idle, Hesitation or stumble during acceleration, Check engine light flashing under load
Fix: The coil-on-plug design cracks internally or arcs to the valve cover. Replace all four coils and plugs together (1.5 hours). Use Motorcraft or equivalent—cheap aftermarket coils fail within a year. Plugs should be copper-core, not platinum in this engine.
Estimated cost: $400-650
Lower Control Arm Bushing Deterioration
Common · low severityTypical onset: 80,000-130,000 mi
Symptoms: Clunking over bumps from front end, Steering pulls or wanders, especially after hitting bumps, Inner edge tire wear on front tires
Fix: Front lower control arm bushings split and separate, causing alignment issues. You can press new bushings in (2 hours per side) but most shops replace the whole arm assembly for reliability (1.5 hours per side). Always do alignment after.
Estimated cost: $450-750
Throttle Body Carbon Buildup (2.0L especially)
Occasional · low severityTypical onset: 70,000-120,000 mi
Symptoms: Rough or high idle (1,200+ RPM), Stalling when coming to a stop, Hesitation or flat spot at low RPM
Fix: Electronic throttle body accumulates carbon on the butterfly plate, causing erratic idle air control. Remove and clean with throttle body cleaner (0.8 hours). Relearn idle procedure required after reinstall. Some need replacement if motor fails ($300-500 part).
Estimated cost: $120-250
EVAP Purge Valve Failure
Occasional · low severityTypical onset: null
Symptoms: P0443, P0455, or P0456 EVAP codes, Rough idle or stalling right after refueling, Fuel smell from engine bay
Fix: Purge valve sticks open or closed, causing fuel vapor issues and emissions failures. Mounted on intake manifold, easy replacement (0.5 hours). Cheap part ($40-80), but verify with smoke test before throwing parts—could also be gas cap or canister vent valve.
Estimated cost: $100-200
Solid budget commuter IF you find a manual or have $3k set aside for eventual automatic replacement—otherwise risky.
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.