The 2006 Ford Focus is generally reliable transportation with a bulletproof Duratec engine, but the automatic transmission is a known weak point that can fail catastrophically. Most examples soldier on past 150,000 miles with basic maintenance, but when problems hit, they tend to cluster around the transmission and ignition coil packs.
Automatic Transmission Failure (4F27E)
Common · high severity
Typical onset: 80,000-140,000 mi
Symptoms: Harsh or delayed shifts, especially 2nd to 3rd gear, Transmission slipping under acceleration, Check engine light with P0734, P0735 codes (gear ratio errors), Burnt transmission fluid smell, Complete loss of forward gears
Fix: The 4F27E transmission suffers from internal clutch pack failure and valve body issues. Transmission oil cooler line failure can also starve it of fluid. Rebuild requires 12-16 hours; most shops recommend replacement with remanufactured unit. External oil cooler and lines should be replaced simultaneously. 10-14 hours labor for R&R.
Estimated cost: $2,200-3,800
Ignition Coil Pack Failure
Common · medium severity
Typical onset: 60,000-120,000 mi
Symptoms: Rough idle and misfires, especially when cold, Check engine light with P0300-P0304 misfire codes, Stumbling or hesitation during acceleration, Poor fuel economy
Fix: The coil-on-plug design is heat-sensitive and fails progressively. Replace all four coils and spark plugs together to prevent comebacks. 1.5 hours labor. This is a known pattern failure on Duratec engines.
Estimated cost: $350-550
Transmission Mounts Collapse
Common · low severity
Typical onset: 70,000-110,000 mi
Symptoms: Excessive engine movement during acceleration, Clunking when shifting between drive and reverse, Vibration felt through shifter, Visible sagging of engine/transmission
Fix: The rubber transmission mount deteriorates and tears, allowing excessive drivetrain movement. Replace transmission mount and inspect engine mounts simultaneously. 1.5-2 hours labor.
Estimated cost: $180-320
Lower Control Arm Bushings Failure
Common · medium severity
Typical onset: 80,000-130,000 mi
Symptoms: Clunking over bumps from front suspension, Wandering or vague steering feel, Uneven tire wear on inside edges, Car pulls to one side after hitting bumps
Fix: Front lower control arm bushings crack and separate. Most techs replace entire control arms with bushings pre-installed rather than pressing new bushings (saves labor, prevents alignment issues). Both sides should be done together. Alignment required after. 3-4 hours labor total.
Estimated cost: $450-700
Alternator Bearing Failure
Occasional · medium severity
Typical onset: 90,000-150,000 mi
Symptoms: Grinding or whining noise from serpentine belt area, Battery warning light flickering or illuminated, Dimming headlights at idle, Electrical system voltage drops below 13.5V
Fix: The alternator bearings fail from heat and contamination. Voltage regulator can also fail internally. Replacement alternator required. 1.5 hours labor including belt tensioner inspection.
Estimated cost: $320-480
Fuel Filter Clogging (Pre-2006.5 Models)
Occasional · medium severity
Typical onset: 60,000-90,000 mi
Symptoms: Hard starting, especially after sitting overnight, Loss of power under load or at highway speeds, Engine stumbling or surging, Stalling when fuel tank gets below 1/4 tank
Fix: Early 2006 models have external fuel filter that can clog with debris. Mid-year refresh moved filter into tank (non-serviceable). External filter replacement is 0.5 hours. If in-tank pump module is clogged, requires dropping tank and replacing entire assembly. 2.5-3 hours labor.
Change automatic transmission fluid every 30,000 miles with Mercon V—this transmission cannot tolerate neglect
Replace all four ignition coils together when one fails; they age uniformly and cascade failures waste money
Inspect transmission oil cooler lines annually for corrosion—they run along subframe and corrode through, causing sudden fluid loss
Use quality spark plugs (Motorcraft or equivalent); cheap plugs accelerate coil failure on this engine
Buy with a manual transmission or budget $3,000 for eventual automatic replacement—otherwise a solid, cheap-to-own commuter if transmission has been maintained.
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.
Fitment notes: Standard top post battery; some ST models may use higher CCA rating
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Every control module on the 2005-2007 Ford Focus — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ Not a separate module. Key programming requires IDS. Maximum 8 keys can be programmed.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
K2 MOTOR IS RECALLING 1,921 AFTERMARKET HEADLAMPS OF VARIOUS MODELS SOLD FOR USE ON THE ABOVE LISTED VEHICLES. THESE HEADLAMPS ARE MISSING THE AMBER SIDE REFLEX REFLECTOR WHICH FAILS TO CONFORM WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT."
Consequence: WITHOUT THE AMBER SIDE REFLEX REFLECTORS, THE LIGHTING VISIBILITY MAY BE AFFECTED, POSSIBLY RESULTING IN A VEHICLE CRASH.
Remedy: K2 MOTOR WILL NOTIFY OWNERS AND OFFER A FULL REFUND. THE RECALL BEGAN ON DECEMEBER 17, 2008. OWNERS MAY CONTACT K2 MOTOR AT 1-909-839-2992.
FUEL SYSTEM, GASOLINE · 06E056000
2006-06-13
CERTAIN AFTERMARKET FUEL FILTERS SOLD UNDER THE PUROLATOR BRAND NAME, P/N F65277, SHIPPED FROM JANUARY 16 THROUGH JUNE 2, 2006, FOR USE ON THE ABOVE LISTED PASSENGER VEHICLES. DUE TO INCORRECT DESIGN, THE QUICK CONNECTORS MAY NOT FULLY SEAT WITH THE TUBE INTERFACE, EVEN THOUGH THE PERSON MAKING THE CONNECTION MAY BELIEVE THAT THE QUICK CONNECTOR IS FULLY ATTACHED.
Consequence: FAILURE OF THIS CONNECTION COULD LEAD TO FUEL SPILLAGE AND, IN THE PRESENCE OF AN IGNITION SOURCE, A FIRE COULD OCCUR.
Remedy: UFI WILL NOTIFY OWNERS AND REPLACE THE FILTERS FREE OF CHARGE. THE RECALL BEGAN ON AUGUST 4, 2006. OWNERS MAY CONTACT UFI FILTERS USA AT 800-230-5876.
Fuel economy (EPA)
City
20mpg
Highway
28mpg
Combined
23mpg
Fuel
Regular Gasoline
Capability & size
EPA class
Compact Cars
Wiper blades
Second generation (Mk2). Hatchback/wagon have rear wiper.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2006 Ford Focus 2.3L I4 Duratec and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.