The 2005-2007 Ford Focus ST, or "ST225," introduced Ford enthusiasts to a more powerful and versatile version of the standard Focus with sporty upgrades, a turbocharged engine, and distinct handling improvements. However, as a nearly two-decade-old car, the Focus ST has developed some common issues that prospective buyers and current owners should understand. Here’s an in-depth look at the most frequent problems found in the Ford Focus ST from this era, tips on what to look for when buying one, and a realistic view of ownership costs.
1. Engine and Powertrain Problems
The Ford Focus ST's defining feature is its turbocharged 2.5-liter inline-5 engine, which is generally strong but has a few notable problem areas.
Turbocharger Wear and Boost Control Issues: Over time, the turbocharger can wear out or develop problems with the boost control solenoid, leading to reduced power and inconsistent boost levels. Turbocharger replacement is costly, so regular maintenance is essential, and potential buyers should test for consistent power delivery during acceleration.
Oil Leaks: One of the most common issues with the ST225 engine is oil leakage, especially from the oil filter housing and valve cover gaskets. These leaks can cause the engine to run low on oil, which, if unchecked, could lead to severe engine damage. Inspecting for leaks and monitoring oil levels are crucial for anyone owning or looking to purchase an ST.
Camshaft and Timing Issues: While the Focus ST's engine generally holds up well, the timing belt, which connects the crankshaft to the camshaft, can degrade over time. Failure to replace it can result in serious engine damage. Ford recommends changing the timing belt around every 80,000-100,000 miles, and it’s best to budget for this maintenance if you’re considering buying a used Focus ST.
PCV Valve and Breather Issues: Another frequent issue in the Focus ST225 is the PCV (positive crankcase ventilation) valve, which can clog or fail, causing oil leaks, smoke, or poor engine performance. Replacing this valve every few years can help prevent issues, but neglected PCV issues can lead to further engine complications.
2. Transmission and Clutch Concerns
The Ford Focus ST from 2005-2007 features a 6-speed manual transmission, which is generally solid but has its own set of common issues.
Clutch Wear and Slipping: Due to the ST’s higher torque and power, many drivers experience premature clutch wear, particularly in cars that have been driven aggressively. Replacement can be costly, so checking for signs of clutch slip—such as difficulty shifting or a burning smell during heavy acceleration—can save potential buyers from unexpected expenses.
Transmission Mounts and Linkages: As these cars age, transmission mounts and shift linkages tend to wear out, leading to gear shift issues and vibrations. These are common wear-and-tear items on many performance cars, and replacement costs can add up over time.
Synchro Issues in Higher Gears: Some owners report grinding or difficulty shifting into third and fifth gears, likely due to synchro wear. While this may not affect every model, test-driving the car at different speeds to assess transmission smoothness is wise.
3. Suspension and Steering Problems
The Focus ST is well-regarded for its handling, but its suspension and steering components can suffer from wear, especially in older models.
Front Lower Control Arm Bushings: Over time, the front lower control arm bushings can degrade, leading to a loose or rattling feeling while driving, as well as uneven tire wear. Replacing these bushings, though relatively inexpensive, can greatly improve handling and comfort.
Strut Mounts and Shock Absorbers: The stock shocks and strut mounts can wear out, especially if the car has been driven aggressively or on rough roads. Symptoms include clunking sounds, poor ride quality, and excessive body roll. Many owners opt for aftermarket performance upgrades when replacing these, though they come with a higher cost.
Steering Rack Leaks: The steering rack in the Focus ST225 can develop leaks, leading to loose or imprecise steering feel. This is a relatively expensive repair, and checking for symptoms such as leaking fluid or unusual sounds when steering is essential.
4. Electrical and Electronic Faults
As with many cars from the early 2000s, the Focus ST has its share of electrical and electronic problems, some of which are due to aging wiring and components.
Instrument Cluster Issues: Owners often report problems with the instrument cluster, including inaccurate gauge readings, flickering lights, or complete failure of the unit. Repairing or replacing an instrument cluster can be costly, so verifying the functionality of all gauges during a test drive is important.
Central Locking and Door Mechanisms: Faulty door locks and central locking systems are relatively common in the Focus ST225. The door actuators and sensors can fail, resulting in doors that won’t lock or unlock properly. Replacing the locking mechanism or sensor is usually the only fix.
Battery Drain: Another issue reported by Focus ST owners is excessive battery drain, often due to faulty alternators or wiring issues. Symptoms include difficulty starting the car and dimming interior lights. A battery tender or routine battery checks can help with battery longevity, but the alternator should also be checked during a pre-purchase inspection.
5. Body and Interior Problems
The Focus ST225 has a sporty, yet practical design, though it faces issues typical of a car this age.
Corrosion and Rust: Rust can be an issue, particularly around the wheel arches, door sills, and undercarriage. Inspecting these areas carefully is crucial before buying, as rust repair is costly and can worsen quickly if untreated.
Worn Seats and Interior Trim: The sporty Recaro seats in the Focus ST can show signs of wear, particularly on the bolsters. Additionally, the interior trim panels may come loose or crack with age. While these issues are largely cosmetic, replacing interior components can still be an expense.
Windshield and Window Seals: Many Focus ST owners report leaking seals, which can allow water to enter the cabin, leading to potential rust and electrical issues. Inspecting seals for cracks or other damage is a good idea, especially if you live in a rainy area.
What to Look for When Buying a 2005-2007 Ford Focus ST
If you’re considering buying a 2005-2007 Ford Focus ST, here’s a quick checklist of essential factors to inspect:
Complete Service History: Make sure the car has a full and consistent service record, especially for items like timing belt changes, turbocharger maintenance, and oil changes. A well-documented history can indicate that the car has been cared for.
Test the Transmission and Clutch: Pay attention to how the car shifts through gears, listen for grinding sounds, and ensure the clutch does not slip.
Check for Rust: Inspect the car’s body, especially the wheel arches and undercarriage, for signs of rust.
Monitor Boost and Engine Performance: Drive the car at different speeds to check for smooth, consistent turbo boost and engine performance. Any hesitation or irregularity may signal turbocharger or fuel system issues.
Verify Electrical Functionality: Test the instrument cluster, lights, and door locks, as these are common problem areas.
How Expensive Is It to Own a 2005-2007 Ford Focus ST?
Owning a Ford Focus ST from this period comes with moderate maintenance costs. Regular service for oil changes, tire rotations, and minor repairs typically runs around $500–$1,000 annually. However, more significant repairs—like a turbocharger replacement, timing belt replacement, or clutch replacement—can cost anywhere from $1,500 to $3,500 each. For major suspension or electrical work, repair costs may range from $500 to $1,000.
Insurance and fuel costs are moderate compared to some other performance vehicles, but the cost of parts can add up. Many owners find that maintaining a reserve of $1,000–$2,000 per year for potential repairs is a reasonable expectation, especially as the vehicle ages.
Final Thoughts
The 2005-2007 Ford Focus ST offers a blend of performance, practicality, and affordability, making it a favorite among enthusiasts. However, it’s essential to be aware of the common problems associated with this model. Prospective buyers should focus on finding a car with a complete service history and a thorough pre-purchase inspection to avoid hidden repair costs.
With proper care and attention, the Ford Focus ST can offer an engaging driving experience, but prospective owners should go in with eyes open to the potential costs and maintenance requirements of this turbocharged classic.