If a warning light is already on, document when it appeared and schedule diagnosis. Treat the current issue as a separate budget item while evaluating protection for later repairs.
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What to check before you buy
Give sellers the same symptom timeline and ask what their offered contracts say about prior conditions, waiting periods and inspection requirements. A later diagnosis date alone does not establish when a condition began.
Work through your own numbers
Keep two columns. In one, record what the shop estimates for the current issue. In the other, record the cost and eligibility of the quote for unrelated future failures. Ask for written answers before you pay.
For a closer look, see our related buying guide. The FTC’s auto warranty and service contract guide explains what to review before signing.
