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Illinois Vehicle Emissions Testing & Lemon Law Guide

Complete guide to Illinois vehicle emissions testing requirements and lemon law protections — free, no signup required.

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Illinois Emissions Testing

⚠ Emissions Testing Required
FrequencyEvery 2 years
Cost$20
Where RequiredChicago metro area counties only

Required in Cook, DuPage, Kane, Lake, McHenry, and Will counties (Chicago area). Not required statewide. Vehicles 4 years old or newer are exempt.

Official IL DMV Info →
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Illinois Lemon Law

Threshold4 repair attempts for the same defect OR 30+ days out of service within 12 months or 12,000 miles
RemedyRefund less reasonable allowance for use
CoversNew vehicles under manufacturer warranty
Official Illinois Lemon Law Info →

Frequently Asked Questions — Illinois

Does Illinois require vehicle emissions testing?
Required in Cook, DuPage, Kane, Lake, McHenry, and Will counties (Chicago area). Not required statewide. Vehicles 4 years old or newer are exempt.
How much does emissions testing cost in Illinois?
Emissions testing in Illinois costs $20. Testing is required in: Chicago metro area counties only.
What is the Illinois lemon law?
The Illinois lemon law protects consumers who purchase a defective new vehicle. A manufacturer must repurchase or replace the vehicle if it cannot be repaired after 4 repair attempts for the same defect OR 30+ days out of service within 12 months or 12,000 miles. The remedy is: Refund less reasonable allowance for use.
How do I file a lemon law claim in Illinois?
To file a lemon law claim in Illinois: (1) Document every repair attempt with dates, descriptions, and repair orders. (2) Track every day your vehicle was out of service. (3) Send a written demand to the manufacturer. (4) If unresolved, contact the Illinois Attorney General's Consumer Protection office or consult a lemon law attorney. Most states require manufacturers to respond within 40 days.
Is a used car covered by the Illinois lemon law?
Most state lemon laws, including Illinois's, primarily cover new vehicles under the original manufacturer's warranty. Used car protections vary — some states have separate used car lemon laws. If you purchased a used vehicle with an active manufacturer's warranty, you may still have some protection. Consult the Illinois Attorney General's office for specifics.

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State laws are updated periodically. Always verify current requirements with your state's DMV or Attorney General's office before making decisions. VinForFree is not a law firm and this information is not legal advice.