Snapped Coil Spring: Automatic MOT Fail
Quick Answer
Yes. A broken or fractured coil spring is an automatic major fail under the May 2018 MOT rules. Pothole impacts and winter salt corrosion cause most snaps. A clunk over bumps or a sagging corner is the giveaway. Single replacement at an independent garage costs £80-150; replacing in pairs (recommended) £150-250.
Coil springs are one of the most pothole-prone parts on a UK car. After a hard winter, mechanics see a spike in fractured springs across cars more than five years old. Since the May 2018 MOT update a snapped spring is a binary fail — no advisory, no second chance. Run your reg through our free MOT history check to see if a spring has been flagged before, and read on for what to listen for.
Will it fail your MOT? The exact rule
Section 5.3.1 of the DVSA MOT Inspection Manual classifies a 'fractured or broken' suspension spring as a major defect. If the fracture causes the spring to contact a tyre or steering component, it becomes a dangerous defect with a £2,500 fine if you drive on the road.
A spring with a missing chunk that leaves the corner of the car visibly lower is also a fail under the 'incorrect ride height' provision of the same section. Sagging beyond manufacturer tolerance is judged on the lower line of the wheel arch against the tyre.
- Snapped spring: major fail
- Spring fragment touching tyre or chassis: dangerous fail
- Sagging ride height beyond tolerance: major fail
- Spring with rust pitting but intact: advisory possible
- Aftermarket lowering spring not type-approved: advisory
Why coil springs snap
UK coil springs corrode over time at the lower coils where road salt and water sit longest. Pitting reduces the cross-section until a single hard pothole hit triggers the fracture. Most snaps therefore happen in late winter and early spring.
Cars more than five years old, with original springs, are the highest risk. Mainstream suspect models include the Vauxhall Astra J, Renault Clio Mk3, Ford Fiesta Mk6 and Audi A3 8P. Lowered or aftermarket springs without correct corrosion protection fail even faster.
How to spot it before the test
The most common first symptom is a single clunk from one corner when going over a sleeping policeman or pothole. The sound comes from the broken end tapping the strut housing on rebound.
Visually inspect each corner with the wheel turned to full lock and a torch in the wheel arch. Count the visible coils on left versus right. A single coil shorter on one side, or a sharp end facing outwards, confirms a fracture.
- Listen for repeated single clunks over bumps
- Compare ride height left vs right (use a tape measure to wheel arch)
- Inspect lower coils for fresh metal break
- Check for spring fragments wedged near the tyre sidewall
- Look for rust scaling at the bottom 1-2 coils
Cost to fix before MOT day
A single front coil spring at an independent garage typically costs £80-150 fitted. Rear coil springs are often cheaper because the strut doesn't need disassembly. Most independents recommend (and many will insist on) replacing in pairs to maintain handling balance.
A pair fitted runs £150-250 on a mainstream car. Sport or coupe variants with progressive-rate or lowered springs can hit £250-450 a pair. Always replace top mounts and strut bearings if they are over 80,000 miles — labour to access them is identical.
- Single front spring fitted: £80-150
- Pair of front springs fitted: £150-250
- Single rear spring: £60-120 fitted
- Pair plus top mounts: £250-400 fitted
- Performance/lowered spring set: £250-450 fitted
MOT history clues for buyers
Repeated coil spring advisories on a used car suggest a stretched suspension or chronic corrosion. Run the registration through our free MOT history check and search for 'spring', 'coil' or 'broken'.
Cross-reference with our common MOT faults database. Some models have spring weakness as a known issue: the Vauxhall Astra J rear, Renault Clio Mk3 front and Ford Focus Mk2 front all feature regularly in DVSA failure data.
Replace single or in pairs?
MOT rules do not require pair replacement, but most workshops do for safety reasons. A new spring has a slightly higher rate than its 70,000-mile partner, which can shift the car's nose under braking and cornering.
If budget is tight, fitting a single spring will pass the test. Plan to replace the partner within the next 5,000 miles, or whenever you next need to disassemble the strut for shock absorbers, top mounts or bearings.
Frequently Asked Questions
Can I drive with a snapped coil spring?
Only if your MOT is still valid and the broken end isn't touching the tyre or chassis (which would make it a dangerous defect). Even then, handling and braking balance are compromised — repair within days, not weeks.
Do coil springs need to be replaced in pairs by law?
No. The MOT manual does not require it. Most garages strongly recommend pair replacement for handling balance, but a single spring fitted to one corner will pass the test.
How long do UK coil springs typically last?
Around 8-12 years on average, but high-mileage minicabs and salt-belt cars in Scotland or coastal areas can see fractures from 5 years. Visual inspection during every service is the cheapest preventive measure.
Are aftermarket springs safe for MOT?
Yes if they're type-approved replacements. Lowering springs without ECE approval can fail under the 'modified ride height' clause of Section 5.3.1, especially if they cause tyre rubbing on full lock.
Why do springs always seem to break in winter?
Road salt accelerates corrosion at the lower coils where moisture sits longest. By late winter the cross-section is at its weakest, and the first sharp pothole impact triggers the fracture.
Listen for clunks, check ride height each side, and book an independent spring replacement before MOT day rather than risking a fail. Run our free MOT history check on any used car you're considering to spot a spring history.