Subject: Notice of a possible covered powertrain defect — [year, make, model]

To [seller's business name]:

I purchased [vehicle description] from you. The vehicle was delivered on [delivery date] with an odometer reading of [delivery mileage] miles.

On [first symptom date], at [odometer reading] miles, I noticed [specific symptoms]. The current odometer reading is [current mileage] miles as of [date]. [Add any earlier notice or repair history, if applicable.]

I am notifying you of this problem and requesting inspection and any repairs covered by 815 ILCS 505/2L. Please confirm receipt and tell me how to make the vehicle available to you for a reasonable opportunity to repair it, including any necessary transport arrangements.

Please provide a repair order identifying the reported problem, diagnosis, work performed, dates and odometer readings at intake and return, and any charge to me. If you dispute coverage, please explain the factual and contractual basis in writing.

Supporting records: [list copies being provided, or state that further records will follow].

[Your name and reply contact information, added privately before sending]

--- PREPARATION NOTES: REMOVE BEFORE SENDING ---
Replace the brackets with accurate details. Do not invent a diagnosis.
Notify the seller promptly; do not delay notice to complete this document.
Review and send the notice yourself, and keep proof of the communication.
Check the seller's contact details on your bill of sale before sending.
Downloading or copying is not notice to the seller or a filed complaint.
This sample does not determine coverage, timeliness, legal sufficiency, or a right to a refund.
Source and explanation: https://turnyourclaim.com/illinois-used-car-lemon-law/