Toyota Yaris MOT Guide: Common Failures, Costs and How to Prepare

The Toyota Yaris has built a deserved reputation as one of the most reliable small cars on UK roads. It consistently tops MOT pass rate tables, and many owners go years without seeing anything more than an advisory. If you drive a Yaris, the odds are firmly in your favour.

But "reliable" doesn't mean "invincible." Every car has its weak spots, and the Yaris is no exception — even if its list is shorter than most. This guide covers the common MOT failure points by generation, what repairs are likely to cost, and how to give your Yaris the best chance of sailing through first time. Whether you've got a trusty Mk2 or a newer hybrid Mk4, there's something here for you.

---

Toyota Yaris Generations at a Glance

Generation	Years	Engine Options	Notes
Mk2 (XP90)	2005--2011	1.0, 1.3, 1.4 D-4D diesel	Bulletproof mechanically. Now ageing, so wear items and corrosion dominate.
Mk3 (XP130)	2011--2020	1.0, 1.33, 1.5, 1.5 Hybrid	Introduced the hugely popular hybrid. Very strong MOT record.
Mk4 (TNGA)	2020+	1.5, 1.5 Hybrid	Built on Toyota's new platform. Excellent reliability so far.

---

Mk2 Yaris (2005--2011): What to Watch For

The Mk2 is getting on now — the oldest examples are over 20 years old — but Toyota's build quality means plenty are still running well. Mechanical failures are rare. The issues that crop up at MOT time are mostly down to age and wear.

Common Failure Points

1. Rear brake drums seizing -- Common on low-mileage cars The Mk2 Yaris uses rear drum brakes, and if the car isn't driven hard or far (which is typical for a small city car), the drums can seize or the shoes can bind. This is especially common on cars that sit on the drive for days at a time. The MOT tester will check that the rear brakes are doing their fair share of work — if the drums are seized, they won't be.

• Symptoms: Handbrake feels tight but the car still rolls, uneven braking, grinding noise from the rear when first moving off
• Cost to fix: £80--£150 for rear brake shoe replacement and drum cleanup (both sides)
• DIY? Moderate. Drum brakes are fiddly but not beyond a confident home mechanic. Plenty of YouTube guides for the Mk2 specifically.

2. Exhaust rear section corrosion The back box and rear pipe section corrode over time, particularly around the joints and where the exhaust sits closest to the road. You'll hear it before you see it — a blowing sound on startup or under load.

• Symptoms: Blowing or rattling from underneath, exhaust smell in the cabin
• Cost to fix: £80--£160 for a rear section replacement (fitted)
• DIY? Possible if the bolts haven't seized. Penetrating oil and patience are your friends here.

3. Power steering pump whine The Mk2 uses a traditional hydraulic power steering system, and the pump can develop a whine over time — especially in cold weather. While a noisy pump alone won't fail the MOT, a failing pump can lead to heavy steering or a fluid leak, both of which can cause a failure.

• Symptoms: Whining noise on full lock, stiff steering when cold, power steering fluid on the ground
• Cost to fix: £150--£300 for a replacement pump (fitted). Topping up the fluid is a temporary fix if the level is low.
• DIY? The pump is accessible, but you'll need to bleed the system afterwards.

4. Headlamp lens clouding After 15-plus years, the plastic headlamp lenses yellow and haze over, reducing light output. The MOT tester can fail the car if the headlamp beam pattern is too diffused.

• Symptoms: Visibly cloudy or yellowed headlamp lenses, dim headlights
• Cost to fix: £5--£10 for a restoration kit, or £40--£70 for replacement headlamp units
• DIY? Absolutely. A headlamp restoration kit and ten minutes of elbow grease work wonders.

---

Mk3 Yaris (2011--2020): What to Watch For

The Mk3 is where the Yaris hybrid took off in the UK, and it's an incredibly common sight in cities and towns. The hybrid powertrain is remarkably dependable, but it introduces a couple of quirks that are worth knowing about before MOT day.

Common Failure Points

1. Brake disc corrosion -- Especially on hybrids This is the big one for the Mk3 hybrid. Because the regenerative braking system does most of the slowing down, the conventional brake discs and pads get used far less than on a normal car. That sounds like a good thing — and it is for pad life — but it means the discs can corrode on the surface, develop pitting, and eventually become ineffective. The MOT tester will check disc condition and braking performance.

• Symptoms: Grinding or scraping noise when braking (especially after the car has sat overnight), visible rust and pitting on the disc surface, juddering through the brake pedal
• Cost to fix: £100--£180 for front discs and pads (both sides, fitted)
• DIY? Yes, and it's a good idea to do it. Standard disc and pad replacement — no hybrid-specific tools needed.
• Prevention tip: Once a week, find a quiet stretch of road and apply the brakes firmly from 30 mph a few times. This scrubs the corrosion off the discs and keeps them in good condition.

2. Rear suspension bushes The rear axle bushes on the Mk3 wear over time, causing a vague feeling from the back end and clunking over bumps. The MOT tester will check for excessive play.

• Symptoms: Knocking or clunking from the rear over rough surfaces, car feeling unsettled at the back
• Cost to fix: £100--£200 (both sides, fitted). The bushes are usually pressed into the axle beam, so labour is the main cost.
• DIY? Difficult without a press. Best left to a garage.

3. CVT transmission judder (hybrid models) The hybrid's CVT gearbox can develop a judder or hesitation, particularly at low speeds. This won't directly fail an MOT, but it can trigger a dashboard warning light — and an illuminated engine management light or hybrid system warning light will fail the test.

• Symptoms: Shuddering when pulling away, warning lights on the dashboard
• Cost to fix: A CVT fluid change (£80--£120) often resolves it. If it doesn't, you're looking at more serious gearbox work.
• DIY? The fluid change is possible at home, but getting the correct fluid level on Toyota's CVT requires a specific procedure. Worth having a specialist do it.

4. Hybrid battery health and warning lights The hybrid battery itself is remarkably reliable — Toyota's track record on this is excellent — but as Mk3s age, some owners see the occasional hybrid system warning light. The battery health isn't directly tested at MOT, but any warning light on the dashboard is checked, and an illuminated hybrid system light is a failure.

• Symptoms: Orange or red warning light on the dashboard, reduced power
• Cost to fix: Diagnosis first (£40--£80). Often it's a sensor or auxiliary battery rather than the main hybrid battery. If the main battery does need reconditioning, expect £500--£1,500 depending on the approach.
• DIY? Diagnosis needs a Toyota-compatible scan tool. Leave this one to the experts.

---

Mk4 Yaris / TNGA (2020+): What to Watch For

The Mk4 Yaris is built on Toyota's excellent TNGA platform, and reliability has been outstanding so far. Most Mk4s are still well within their first few years on the road, so serious MOT issues are rare. That said, there are a couple of things worth keeping an eye on as these cars start to age.

Common Failure Points

1. Brake disc corrosion -- Same hybrid quirk The Mk4 hybrid has the same regenerative braking characteristic as the Mk3 — the conventional brakes don't get used much, so the discs corrode. Toyota has improved the disc coating on the Mk4, but the underlying issue remains.

• Symptoms and fix: Same as the Mk3 above. Weekly firm braking keeps on top of it.
• Cost to fix: £110--£190 for front discs and pads (both sides, fitted)

2. TPMS sensor battery life The Mk4 uses direct tyre pressure monitoring sensors in each wheel. These sensors are battery-powered, and the batteries typically last 5--7 years. As Mk4s reach the 5-year mark, expect some TPMS warning lights to appear. An illuminated TPMS light is an MOT failure.

• Symptoms: TPMS warning light on the dashboard, intermittent tyre pressure readings
• Cost to fix: £30--£60 per sensor, plus fitting and programming
• DIY? Not really. The sensors need to be paired to the car's system, which requires a diagnostic tool.

3. General age-related items Beyond the above, the Mk4 Yaris is remarkably trouble-free. The most likely MOT failures at this age are the universal ones: a blown bulb, worn wiper blades, or a tyre below the 1.6mm tread limit. Nothing Yaris-specific.

---

Yaris-Specific MOT Preparation Checklist

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

One Week Before

• Rear brakes: On drum-brake models (Mk2), check the handbrake holds on a slope. On hybrid models, check disc surfaces for heavy corrosion through the wheel spokes.
• Hybrid brakes: If you drive a hybrid, do a few firm stops from 30 mph on a quiet road to scrub the discs clean.
• Exhaust: Start the car from cold and listen for blowing or rattling underneath (especially Mk2).
• Dashboard warning lights: Start the engine and watch the dashboard. All lights should illuminate briefly then go out. Any that stay on need attention before the test.
• Rear suspension: Push down firmly on each rear corner and let go. The car should bounce back and settle. If it bounces more than once or clunks, the bushes or dampers may be worn.
• Headlamp lenses: Look at the headlamps. If they're cloudy or yellowed, restore or replace them.
• TPMS (Mk4): Check the TPMS light isn't illuminated. If it is, get the sensors checked.

The Night Before

• Check all bulbs — headlights, tail lights, indicators, brake lights, reversing lights, number plate lights
• Top up screenwash
• Fit fresh wiper blades if the current ones leave smears
• Clean front and rear number plates so they're legible
• Check tyre tread depth (minimum 1.6mm) and pressures

---

What an MOT Should Cost for a Toyota Yaris

The maximum fee for a standard car MOT in 2026 is £54.85, but most garages charge between £30 and £50.

Typical Repair Costs for Common Yaris MOT Failures

Repair	Approximate Cost
Rear brake shoes and drum cleanup (both sides, fitted)	£80--£150
Front brake discs and pads (both sides, fitted)	£100--£190
Exhaust rear section replacement (fitted)	£80--£160
Rear suspension bush replacement (both sides, fitted)	£100--£200
Power steering pump replacement (fitted, Mk2)	£150--£300
TPMS sensor replacement (per sensor, fitted)	£30--£60
Headlamp restoration kit	£5--£10
Bulb replacement (single bulb, fitted)	£5--£15
Wiper blades (pair, fitted)	£10--£25

---

Key Takeaways

1. The Yaris is one of the most reliable MOT performers on UK roads. Its pass rates are consistently among the highest for any car, across all generations. If you own one, you're starting from a strong position.
2. Hybrid brake disc corrosion is the main Yaris-specific issue. Regenerative braking means the conventional brakes barely get used, so the discs corrode. A weekly firm stop from 30 mph keeps them in shape.
3. Mk2 drum brakes seize from lack of use. If your Mk2 is a low-mileage runaround, make sure the rear brakes are actually working before the test.
4. Dashboard warning lights catch people out. This applies to all generations, but especially hybrids. Any illuminated warning light is a potential failure — get it diagnosed early.
5. Don't fail on the easy stuff. Bulbs, wipers, screenwash, tyre tread — these cost almost nothing to sort and account for a huge share of MOT failures across all cars, Yaris included.

The Yaris is about as close to a guaranteed MOT pass as you can get — but only if you give it a quick once-over beforehand. Twenty minutes of checks a week before the test is all it takes.

---

Check Your Yaris Before the MOT

Want to know exactly what to look for on your Yaris before booking your MOT? Our free MOT Checker walks you through the key checks for your specific car and flags anything that needs attention — so you can turn up to the test with confidence.

Check my Yaris now