When Is a Car a Lemon in Missouri?

A car is a “lemon” under Missouri law (§ 407.560 et seq.) when:

1. The vehicle has a nonconformity that substantially impairs its use, market value, or safety.
2. The defect has not been fixed after a reasonable number of repair attempts.
3. The thresholds are met within the 1-year Rights Period.

The two thresholds

Under § 407.567:

• 4 or more repair attempts for the same nonconformity, OR
• 30 or more cumulative working days out of service.

The working-day OOS counting is more consumer-favorable than calendar-day jurisdictions.

What “substantially impair” means

Missouri courts interpret “substantially impair” broadly: use, market value, or safety. A defect can qualify on any one of these prongs.

Examples that qualify

• Transmission shudders / slips repeatedly (Ford 10R80, Nissan CVT).
• Engine stalls in traffic.
• Brakes fail / pulse violently.
• Electrical warning lights / phantom drain.
• Steering wander or EPS failure (death wobble in pickups).
• Infotainment locks up.
• EV charging won’t work.

Examples that typically DON’T qualify

• Cosmetic issues.
• Wear items (tires, brake pads after normal use).
• Consumer-modified parts.
• Issues outside the 1-year Period.
• Damage from tornado/hail.

The written notice requirement

§ 407.569 requires written notice to the manufacturer with a final repair opportunity. See our how to file guide.

Bottom line

If your MO vehicle has a defect that substantially impairs use, market value, or safety AND has been to the manufacturer’s authorized dealer 4+ times OR 30+ working days OOS within the 1-year Rights Period, you likely have a Lemon Law case. Move quickly — the 1-year window is tight.

Related

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Do I Need a Lawyer for a Missouri Lemon Law Claim?

BBB Auto Line is consumer-friendly without counsel; court action with MMPA (post-SB 591) requires representation. Mandatory fees make either path no-cost.

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How Long Do I Have to File a Missouri Lemon Law Claim?

Missouri's 1-year Rights Period + generous 5-year MMPA SOL + 4-year Magnuson-Moss / UCC backstop.

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How Much Does a Missouri Lemon Law Claim Cost?

Missouri Lemon Law costs — $0 BBB Auto Line; court action with mandatory triple fee shifting typically zero out-of-pocket.

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The Manufacturer Denied My Missouri Lemon Law Claim — Now What?

What to do when the manufacturer denies your claim — proceed to BBB Auto Line or court action with MMPA + Magnuson-Moss.

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Are Used Vehicles Covered Under Missouri Lemon Law?

No — Missouri's § 407.560 Lemon Law does not cover used vehicles. Magnuson-Moss, MMPA (post-SB 591), and UCC remain available.

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Does It Matter Which Repair Shop I Use in Missouri?

Yes — Missouri Lemon Law requires repairs at a manufacturer-authorized service facility.

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