Ford Fiesta MOT Guide: Common Failures, Costs & How to Prepare

The Ford Fiesta is the UK's best-selling car of all time. Millions are on the road, and a huge number roll through MOT stations every single day. If you own one, you're in good company — but you should also know that the Fiesta has some well-documented weak spots that crop up at MOT time.

This guide covers the most common Fiesta MOT failures by generation, what they'll cost you, and how to prepare your car for a first-time pass. Whether you've got a Mk6 that's seen better days or a relatively fresh Mk8, there's something here for you.

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Ford Fiesta Generations at a Glance

Generation	Years	Notes
Mk5	2002–2008	Getting on now. Corrosion and suspension wear are the big issues.
Mk6 / Mk6.5	2008–2017	The most common Fiesta on the road. Reliable but with known niggles.
Mk7	2017–2023	More tech means more to go wrong electronically, but generally solid.
Mk8	2023+	Still relatively new. Unlikely to have major MOT issues yet.

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Mk5 Fiesta (2002–2008): What to Watch For

These are now 18–24 years old, so they've had a hard life. If yours is still going, well done — but expect the MOT to be thorough.

Common Failure Points

1. Rear suspension springs — Very common The Mk5 Fiesta is notorious for broken rear coil springs. They corrode at the bottom coil (where road salt and moisture sit) and eventually snap. This is an MOT failure and needs replacement.

• Symptoms: Clunking from the rear over bumps, car sitting unevenly
• Cost to fix: £60–£120 per side (parts and labour)
• DIY? Possible with spring compressors, but not recommended unless you're experienced

2. Front suspension — Lower arms and ball joints The front lower arms and ball joints wear, causing clunking and play in the steering. The tester will check for excessive movement.

• Cost to fix: £80–£150 per side
• DIY? Moderate difficulty. Requires a ball joint separator and wheel alignment afterwards.

3. Exhaust corrosion The mid-section and rear box corrode, especially around the joints. Listen for blowing sounds.

• Cost to fix: £60–£150 (depending on which section)
• DIY? Possible with exhaust paste for minor leaks, but a corroded section needs replacement.

4. Structural corrosion — Sills and rear arches At this age, rust is a real concern. Check the sills (run your hand underneath — if it feels flaky or thin, that's bad), rear wheel arches, and the area around the rear subframe mounting points.

• Cost to fix: £100–£400+ for welding, depending on severity
• DIY? Surface rust can be treated with rust converter. Structural rust needs a welder.

5. Lighting Headlamp lenses cloud and yellow over time, reducing light output. The lenses also crack and let moisture in.

• Cost to fix: £5–£10 for a restoration kit, or £30–£60 for replacement headlamp units
• DIY? Yes — headlamp restoration kits work well on the Mk5.

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Mk6 / Mk6.5 Fiesta (2008–2017): What to Watch For

This is the generation you'll see most at MOT stations. Ford fixed a lot of the Mk5's issues, but the Mk6 has its own character.

Common Failure Points

1. Rear coil springs — Still a problem Ford didn't entirely solve the spring issue. Mk6 Fiestas still break rear springs, though less frequently than the Mk5. It's worse on cars driven in areas with heavy road salt use.

• Cost to fix: £60–£120 per side
• Tip: If one side has snapped, replace both. The other one won't be far behind.

2. Front lower arm bushes The front lower arm bushes wear, causing a vague feeling to the steering and clunking over potholes. This shows up as excessive play during the MOT.

• Cost to fix: £60–£100 per side (usually the whole arm is replaced as the bush is pressed in)
• DIY? Moderate. The arms are bolt-on, but you'll need an alignment afterwards.

3. Brake discs and pads — Especially front The Mk6 Fiesta is hard on front brakes. Discs warp and wear, pads run thin. You can usually see the discs through the wheel spokes — if there's a deep lip around the edge, they need replacing.

• Cost to fix: £80–£140 for front discs and pads (both sides)
• DIY? Yes, if you're comfortable with basic spanner work. Good beginner brake job.

4. EcoBoost engine issues (1.0 three-cylinder) The 1.0 EcoBoost engine is brilliant, but early versions (2012–2014) had a known coolant hose issue that could lead to overheating. While this isn't directly an MOT failure, an engine management light caused by overheating damage will fail the test.

• What to check: Engine management light on the dashboard. If it's illuminated, get it diagnosed before the MOT.
• Cost: Varies widely. Could be a £15 sensor or a much bigger problem.

5. Wiper linkage The wiper linkage on the Mk6 is known to seize or become sloppy, causing the wipers to not clear the screen properly. The tester will check wiper effectiveness.

• Cost to fix: £40–£80 for a replacement linkage
• DIY? Yes, it's accessible under the scuttle panel.

6. Number plate lights The small bulbs behind the rear number plate blow regularly on the Mk6. Easy to miss, easy to fix.

• Cost to fix: Under £2 for a pair of bulbs
• DIY? Takes about 30 seconds. Pop the lens cover off, swap the bulb, clip it back on.

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Mk7 Fiesta (2017–2023): What to Watch For

The Mk7 is a more modern, more refined car — but "more modern" means more electronics and more potential for warning light failures.

Common Failure Points

1. TPMS (Tyre Pressure Monitoring System) faults The Mk7 Fiesta uses direct TPMS sensors in each wheel. If a sensor fails or loses connection, the TPMS warning light illuminates on the dashboard — and that's an MOT failure on cars first registered from 1 January 2012.

• Cost to fix: £30–£60 per sensor, plus fitting and programming
• DIY? You can't easily do this at home. The sensors need programming to the car's ECU.

2. LED and DRL issues Many Mk7 Fiestas have LED daytime running lights and LED rear light clusters. When an LED element fails, you often can't replace individual bulbs — the whole unit may need replacing.

• Cost to fix: £50–£200+ for a replacement light unit
• DIY? Fitting is usually straightforward. The cost is in the parts.

3. Electronic parking brake issues Higher-spec Mk7 Fiestas have an electronic parking brake rather than a traditional handbrake lever. If the EPB system develops a fault, it can cause an MOT failure if the tester can't adequately test the parking brake.

• Cost to fix: Varies. Could be a recalibration (£30–£50 at a garage with the right diagnostic tool) or a more serious repair.

4. Brakes — front discs and pads As with the Mk6, the Mk7 wears front brakes relatively quickly, especially in town driving.

• Cost to fix: £90–£160 for front discs and pads
• DIY? Yes, similar process to the Mk6.

5. Suspension — still springs Even the Mk7 can break rear springs, though it's less common than older generations.

• Cost to fix: £70–£130 per side

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Fiesta-Specific MOT Preparation Checklist

Use this alongside our main MOT checklist for a Fiesta-specific check:

One Week Before

• Check rear coil springs — look through the wheel arch with a torch for cracks at the bottom coil
• Inspect front lower arms — grab the wheel at 3 and 9 o'clock and rock it. Any clunking = worn joints.
• Check front brake discs and pads through the wheel spokes
• Listen for exhaust blowing on startup (especially Mk5/Mk6)
• Look at the sills for corrosion (especially Mk5)
• Check all dashboard warning lights clear after starting the engine
• Test the wipers — do they clear the screen properly or leave smears?
• Check the number plate lights (bulb access varies by generation)

The Night Before

• Replace any blown bulbs
• Top up screenwash
• Fit fresh wiper blades if needed
• Clean number plates
• Check tyre tread and pressures

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What an MOT Should Cost for a Ford Fiesta

The maximum fee for a standard car MOT in 2026 is £54.85, but most garages charge between £30 and £50. Many offer deals — especially supermarket auto centres and national chains.

Typical Repair Costs for Common Fiesta MOT Failures

Repair	Approximate Cost
Rear coil spring (one side, fitted)	£60–£120
Front lower arm with bush (one side, fitted)	£60–£100
Front brake discs and pads (both sides, fitted)	£80–£160
Rear brake shoes or pads (both sides, fitted)	£60–£100
Exhaust mid-section replacement (fitted)	£80–£150
Bulb replacement (single bulb, fitted)	£5–£15
Wiper blades (pair, fitted)	£10–£25
Number plate (single, supplied and fitted)	£15–£25

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Save Money — Prepare First

The simplest way to avoid surprise MOT costs on a Fiesta is preparation. The easy stuff — bulbs, wipers, screenwash, number plate fixings, tyre tread — accounts for a huge proportion of failures, and all of it costs next to nothing to sort.

Our CarOkay Essential Kit (£24.99) covers the basics that catch Fiesta owners out most often. If you want to go further, the Premium Kit (£39.99) adds number plate fixings and a tyre pressure gauge — both useful for the Fiesta's known niggles.

For older Fiestas (Mk5 and early Mk6), the Ultimate Kit (£59.99) includes a brake fluid tester and DPF cleaner — worth having if your car's getting on a bit.

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Key Takeaways

1. Rear springs are the Fiesta's Achilles heel across all generations. Check them before every MOT.
2. Front brakes wear quickly. Budget for discs and pads every 25,000–35,000 miles.
3. Bulbs and wipers are the cheapest fixes and the most common failures. Don't lose your test over a £2 bulb.
4. Dashboard warning lights are becoming a bigger issue on newer Fiestas with more electronics. Get them cleared before the test.
5. Prepare early. A week before gives you time to order parts and fit them yourself.

Your Fiesta has given you thousands of reliable miles. Give it 20 minutes of attention before the MOT and it'll reward you with a pass certificate.