MOT/Advisories/Corrosion

Corrosion Advisory

Minor
Can drive
£200–£1,500+

What does this advisory mean?

DVSA identified visible rust or corrosion on body, suspension, or structural components. Surface rust is cosmetic; deep corrosion weakens structural integrity and affects safety. UK salt + moisture create chronic corrosion risk, especially on older vehicles.

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Why does this happen?

  • Age and mileage exposure to water and salt
  • Winter gritting salt accumulation (especially UK)
  • Damage to protective paintwork
  • Poorly maintained undercarriage protection
  • Geographic location (coastal areas, high rainfall regions)
  • Suspension components most vulnerable

Quick answer

Corrosion ranges from cosmetic surface rust to structural damage. Body panel rust is minor; suspension/frame corrosion is major and affects safety. Fix within 3–6 months to prevent deeper deterioration.

Seriousness by location

Body panels, trim, undercarriage (minor)

Cosmetic. Fix within 6 months for resale value. Not urgent.

Suspension components, brakes (major)

Affects safety and MOT. Repair within 1–2 months before failure.

Structural frame, mounting points (dangerous)

Weakens vehicle integrity. Risk of dangerous defect. Urgent assessment needed.

Signs corrosion is worsening

  • Rust spot growing or spreading across multiple areas
  • Rust turning orange/brown (active oxidation, not just surface)
  • Bubbling or flaking paint near rust areas
  • Rust holes (corrosion eating through metal)
  • Handling changes (bent suspension arms from rust-induced failure)
  • Suspension making creaking sounds (corroded mounting points)

Real DVSA wording

"Corrosion evident, but not affecting structural integrity"

DVSA's phrasing is key—they're saying rust exists but structure is still sound. Get deeper assessment if they mention structural areas (frame, mounting points).

Typical UK repair costs

Surface body rust: £150–£300 (touch-up/respray)

Deep panel corrosion: £400–£800 (welding/panel replacement)

Suspension corrosion: £250–£600 (ball joint/arm replacement)

Structural welding: £600–£1,500+ (frame/mounting repair)

Coastal/gritted-road vehicles have higher rates. Preventive coating (undersealing) costs £150–£300 annually.

When to fix it

Monitor within 3 months

Minor body/trim rust can be addressed at next service. Suspension corrosion needs faster attention.

Ownership signal: Corrosion history is permanent. Buyers see chronic rust as a sign of geographic exposure or maintenance neglect. Fix and protect now to preserve resale value.

Prevent future corrosion

  • Wash undercarriage monthly in winter (salt removal)
  • Apply protective undersealing (£150–£300 annually)
  • Park in garage or covered area if possible
  • Repair paint chips immediately (exposes bare metal)
  • Check suspension for early rust signs (2x yearly)

Related advisories

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Last reviewed: July 2026 · MOT data sourced from DVSA · Editorial Policy