You shop for a service contract because you fear a future repair. But the repair you should worry about may already be written down. Look in the glovebox, the folder on the kitchen counter, and the text thread with your mechanic. If a shop has already told you a part is worn, leaking, or failing, you have a known problem, and a contract written after that point may treat it very differently from a surprise.
Why a known problem changes the question
Most service contracts are built around breakdowns that happen after the contract starts. Many also exclude conditions that existed before the purchase or before the coverage start. Some call this a pre-existing condition, and others use wording about prior damage or known defects. The wording is what you need to read. The general idea is the same: a fault documented before you bought the contract is one many contracts are written to leave out.
Gather the paper you already have
Pull together any written estimate, repair order, inspection report, or invoice from the last stretch of ownership. Include the service history from the dealer or your independent shop, and any notes from an earlier inspection, such as one done before a sale. Read each document for the part named, the wording used (worn, leaking, failing, recommended, or simply needs attention), and the date and mileage written on it. Those details are what a claims reviewer will compare against the contract's start terms.
Put the known items in writing
Make a short list of every open item. Then ask the provider, before you pay, how each item would be handled. Ask whether the contract excludes it, whether an inspection is required before coverage begins, and whether a waiting period applies to that specific part. Get the answers in writing. A verbal yes from a salesperson is not the contract, and the sample contract is what anyone will read later if a claim is filed.
Consider the repair before the contract
Sometimes the sensible move is to have the known item fixed first, then buy a contract that starts from a clean record. Compare the repair estimate with the terms you are being offered. A contract may not pay for a repair that was already on the table when you bought it. Ask the shop to note the completed work on the invoice, and keep that invoice in the same folder as the contract.
What the sales pitch leaves out
A salesperson will often describe a contract as protection against whatever goes wrong. Skip that line and ask which known items the contract names as excluded, and whether the provider can see your service records. If the answers are vague, the contract may not be built for the car you actually have.
Where to look next
Once your list is written, compare how providers word their exclusions. The comparison table lays out the published terms side by side. The list of providers that post a sample contract lets you read the exclusion wording before any salesperson is involved. The methodology page explains how the published terms are scored, so you can see what has been counted and what has not.