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Ford Mustang Problems & Known Issues

The most common Ford Mustang problems ranked by severity — what to watch for, what it costs to fix, and what happens if you ignore it.

Generations

SN95 — Fourth Generation
1994–2004
3.8L V6, 4.6L V8
S197 — Fifth Generation
2005–2014
4.0L V6, 4.6L V8, 5.0L V8, 5.4L Supercharged V8
S550 — Sixth Generation
2015–2023
2.3L EcoBoost I4, 5.0L Coyote V8, 5.0L Supercharged V8

Top issues to watch for

The most serious Ford Mustang problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.

Major
Parking brake system failure
S197, S5502005–20230k–80k miles
The electronic parking brake system on Mustangs shows exceptionally high failure rates in UK MOT data, with efficiency dropping below the required 50% threshold at rates up to 38x higher than the fleet average. The system uses electric actuators on the rear brake calipers that commonly fail due to corrosion of internal mechanisms and seized actuator motors. This is particularly problematic on S550 generation cars with the 5.0L engine where failures peak in the 20-40k mile range.
What happens if ignoredComplete parking brake failure means the car cannot be safely parked on inclines and will fail its MOT test. Electronic actuator replacement typically requires dealer-level diagnostics and programming. In emergency situations, the driver may not be able to apply the parking brake if the electronic system fails.
Independent garage
£400–£800
Specialist
£500–£900
Main dealer
£800–£1,400
Parts only
£250–£500
Major
Premature wheel bearing failure
S197, S5502005–20230k–120k miles
Mustangs exhibit wheel bearing failures at rates up to 34x higher than the UK fleet average, particularly affecting 5.0L variants in the 20-40k mile range. The combination of performance-oriented suspension geometry, wider tyres, and higher cornering loads places additional stress on the hub assemblies. Front bearings are most commonly affected, though all four corners can fail prematurely compared to typical family cars.
What happens if ignoredA collapsed wheel bearing can cause the wheel to seize or detach, creating an immediate safety hazard. Early intervention allows for bearing replacement without hub damage. Delayed repair can require complete hub assembly replacement and may damage the suspension upright, significantly increasing costs.
Independent garage
£200–£400
Specialist
£250–£450
Main dealer
£400–£700
Parts only
£80–£200
Minor
Suspension component wear (S197/S550)
S197, S5502005–20230k–120k miles
MOT data shows suspension pins, bushes and joints failing at rates up to 17.2x higher than the fleet average across multiple Mustang variants. The performance-oriented suspension setup uses larger anti-roll bars and stiffer bushings that are more susceptible to wear from spirited driving. Lower control arm bushings, anti-roll bar drop links, and ball joints are the most commonly affected components, with failures spanning from very low mileages on the 4.6L variants.
What happens if ignoredWorn suspension components compromise handling precision and can affect tyre wear patterns. While not immediately dangerous, continued driving with severely worn bushings can accelerate wear of other suspension components and reduce the effectiveness of the car's safety systems like ABS and stability control.
Independent garage
£150–£350
Specialist
£200–£400
Main dealer
£300–£600
Parts only
£50–£150
Minor
Exhaust system excessive noise
S5502015–20230k–40k miles
The 5.0L Mustang shows exhaust noise failures at 57.5x the UK fleet average, primarily on low-mileage examples in the 0-40k range. This typically results from aftermarket exhaust modifications that exceed UK noise regulations, but can also occur due to factory active exhaust valve failures or damaged rear silencers. UK MOT noise limits are stricter than many other markets, making US-specification or modified exhausts likely to fail.
What happens if ignoredExcessive exhaust noise will result in immediate MOT failure and the car cannot be legally driven on UK roads until rectified. Owners may need to fit UK-compliant silencers or revert to the original exhaust system, which can be costly if the original parts were not retained.
Independent garage
£300–£800
Specialist
£400–£1,000
Main dealer
£600–£1,500
Parts only
£200–£600

1 more known issues tracked

Including wear items, electrical niggles, and generation-specific problems. Check a specific car to see which issues apply to its age and mileage.

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MOT failure hotspots

Based on DVSA MOT test data. These are the items where the Ford Mustang fails at a significantly higher rate than the average car.

Exhaust system damage
Bodywork · 20-40k miles
MOT failure rate: 58x the fleet average
Sample: 9,496 tests
Parking brake efficiency less than 50% of the r...
Brakes · 40-60k miles
MOT failure rate: 35x the fleet average
Sample: 3,369 tests
Parking brake inoperative on one side
Brakes · 20-40k miles
MOT failure rate: 25x the fleet average
Sample: 13,980 tests
Wheel bearings worn
Suspension · 0-20k miles
MOT failure rate: 18x the fleet average
Sample: 192 tests
Suspension pin, bush or joint worn
Suspension · 20-40k miles
MOT failure rate: 17x the fleet average
Sample: 1,066 tests
Track rod ends worn
Steering · 40-60k miles
MOT failure rate: 17x the fleet average
Sample: 1,168 tests

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Related

Ford Mustang reliability FAQs

What are the most common problems with the Ford Mustang?

The Ford Mustang has 5 known issues across 2 severity levels. The most common problems relate to Parking brake system failure and Premature wheel bearing failure.

Is the Ford Mustang reliable?

The Ford Mustang has 0 dangerous and 2 major known issues. No dangerous issues are tracked, which is a positive sign.

How much does it cost to fix Ford Mustang problems?

Repair costs range widely. The most significant issue (Parking brake system failure) costs £400–£800 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.

Which Ford Mustang generation is most reliable?

The SN95 (1994–2004) has the fewest dangerous issues (0). However, condition and service history matter more than generation — a well-maintained earlier car can be more reliable than a neglected newer one.