Ford Focus ST Mk2 (ST225) Maintenance Guide
Ford Focus ST Mk2 (ST225) Maintenance Guide
The Ford Focus ST Mk2 (ST225) is a performance-focused hatchback that combines power, handling, and everyday practicality. Built from 2006 to 2010, the ST225 is powered by a 2.5-litre turbocharged Duratec engine. While the car is designed to be reliable, proper maintenance is essential to ensure it performs at its best over time. This guide will cover key aspects of maintaining the ST225, referencing the Ford service schedule, and addressing common issues, such as boosting problems.
1. Ford Service Schedule
To keep your Focus ST225 running smoothly, it’s essential to follow the recommended service schedule. The typical maintenance intervals for the ST225 are outlined as follows:
- Oil and Filter Change: Every 12 months or 12,500 miles (20,000 km), whichever comes first.
- Air Filter: Every 24 months or 24,000 miles (40,000 km).
- Spark Plugs: Every 36 months or 36,000 miles (60,000 km), or as specified in the owner's manual.
- Brake Fluid: Every 24 months or 24,000 miles (40,000 km).
- Coolant: Every 5 years or 75,000 miles (120,000 km), or 6 years if the car is used in severe conditions.
- Timing Belt: The timing belt on the ST225 should be checked every 5 years or 75,000 miles (120,000 km), and replaced at 10 years or 150,000 miles (240,000 km), depending on your usage.
- Clutch Fluid: Inspect every 36 months, though it generally doesn’t need to be replaced unless there's an issue. If you're tuned, consider upgrading to the RS clutch.
- Transmission Fluid: Check at least once a year or 12,500 miles (20,000 km), especially if you notice shifting issues.
- Tyre Checks: Inspect for wear and tear at least once a month, ensuring they are rotated regularly to ensure even wear.
Regular servicing at these intervals helps prevent costly repairs down the road and ensures your vehicle is performing optimally.
2. Common Boosting Issues
One common issue many Focus ST Mk2 owners face is problems with boosting, which can affect the vehicle's overall performance. If you notice a decrease in power, unusual noises, or poor throttle response, these issues could be linked to the car’s boost system. Here are the first three components to check:
- MAP Sensor (Manifold Absolute Pressure Sensor): The MAP sensor monitors the pressure inside the intake manifold and helps the ECU calculate the correct air-to-fuel ratio for optimal performance. If the MAP sensor is faulty or dirty, it can result in incorrect data being sent to the ECU, causing a loss of power or engine hesitation. Clean or replace the MAP sensor if necessary.
- MAF Sensor (Mass Air Flow Sensor): The MAF sensor measures the amount of air entering the engine and helps adjust the fuel mixture. If this sensor becomes contaminated or malfunctions, it can affect engine performance and fuel efficiency. A clean MAF sensor ensures proper air/fuel ratio calculations, leading to smoother performance.
- Boost Solenoid: The boost solenoid controls the amount of pressure the turbocharger generates. A malfunctioning boost solenoid can lead to inconsistent boost levels, causing performance issues such as power loss or sluggish acceleration. It's advisable to inspect the solenoid for any signs of damage or wear.
If none of these components resolve the issue, it’s worth further investigation using Forscan or a similar diagnostic tool. Datalogging the vehicle can provide valuable insights into how the engine is performing and reveal more complex issues with the boost system.
3. Oil and Filter Changes
As with any high-performance engine, maintaining clean oil and a fresh filter is essential for the longevity and smooth operation of the engine. Ford recommends changing the oil and filter every 12,500 miles (20,000 km) or annually, whichever comes first. Make sure to use the recommended oil grade, as specified in the owner’s manual. Using the wrong oil could cause excessive engine wear or poor performance.
Check out our range of Genuine Ford parts here
4. Brake System Maintenance
The Focus ST225’s braking system plays a vital role in both safety and performance. Inspect the brake pads and discs at regular intervals, especially if you drive aggressively or track the car. Replace the pads when they become worn to maintain optimal braking performance. Additionally, ensure that the brake fluid is changed every 24,000 miles (40,000 km), as moisture can accumulate over time, reducing brake performance.
As the ST225 gets older, more and more people look to change their braking systems to offer improved braking feel/performance. Check out our range of brake products here.
5. Suspension Checks
The ST225 is built for performance handling, which means the suspension components are subject to higher wear than a standard Focus. Periodically check the shock absorbers, springs, and suspension bushings for any signs of wear or damage. Worn suspension components can lead to poor handling, excessive body roll, and tyre wear. If you notice any unusual sounds, like knocking or clunking, it's important to inspect the suspension system.
Due to age more than anything else, we have experienced a significant increase in issues relating to bushes degrading due to wear, or LCA (lower control arms) requiring replacement - you can find a full list of our ST225 suspension products here
6. Timing Belt and Water Pump
The timing belt on the ST225 is a critical component, and failure can result in catastrophic engine damage. As mentioned earlier, it should be replaced every 150,000 miles (240,000 km) or 10 years, whichever comes first. When replacing the timing belt, it’s also a good idea to replace the water pump, as both components often wear at similar rates. Replacing them together can save on labour costs, as the timing belt must be removed to access the water pump.
7. Cooling System
The cooling system in the Focus ST225 needs to be checked regularly to prevent overheating. Over time, the coolant can degrade, and hoses can become brittle or crack. Make sure the coolant is topped up and is in good condition by checking the coolant reservoir and radiator at regular intervals. Ford recommends flushing the cooling system and replacing the coolant every 75,000 miles (120,000 km) or 5 years, whichever comes first.
8. Tyres and Wheel Alignment
Ensure your tyres are in good condition, as the ST225’s performance can be compromised by worn or poorly maintained tyres. Check for uneven wear, which could indicate an alignment or suspension issue. Regularly rotate your tyres to ensure even wear, and check the tread depth to ensure they are within legal limits. Also, make sure the wheel alignment is correct to avoid uneven tyre wear and poor handling.
9. Exhaust System
A well-maintained exhaust system is important not only for performance but also for meeting emissions regulations. Check for any signs of damage, rust, or leaks in the exhaust system, especially around the turbo and downpipe area. The turbocharged engine relies on an efficient exhaust system to reduce turbo lag and maximise performance, so addressing any exhaust leaks promptly will help maintain optimal performance.
The Focus ST Mk2 suffers from the downpipe bolts vibrating themselves out, this is solved by installing a locker kit that prevents this from happening. You may find that the exhaust is blowing or leaking from the downpipe if this were to be the case.
Conclusion
Maintaining your Ford Focus ST Mk2 (ST225) is essential for keeping it running at its best, and staying on top of regular servicing will help prevent major issues in the future. By adhering to the Ford service schedule, paying attention to common boosting issues, and regularly checking key components such as the engine, brakes, and suspension, you can ensure that your Focus ST225 continues to provide a thrilling driving experience. If you're unsure about any aspect of maintenance, it’s always worth consulting with a professional mechanic who is familiar with these vehicles. Regular maintenance and attention to detail will help keep your Focus ST225 in top condition for years to come.