Most people do not decide they need a service contract. They decide they are tired of a bill. Before any paperwork, the useful question is whether your car has a pattern or just a bad stretch, because a pattern is where protection deserves a close read, and a one-time repair usually is not.
Count the return visits
Pull out every repair invoice you have for the car and lay them in order. Write down the mileage on each, the system involved, and the part replaced. Then look for the same complaint coming back: a noise the shop said was fixed that returned, a warning light that reappeared after a reset, a starter or sensor that failed again after replacement. One worn part is ordinary upkeep. The same system failing over and over is different, and it is the signal worth taking seriously.
Separate a pattern from bad luck
A pattern usually shows up as a short gap between visits on the same system, a repair that did not hold, or a replacement that left the complaint in place. Different shops giving different answers about the same symptom is also worth noting. Keep in mind that your list is evidence for a conversation, not a diagnosis. Only a licensed technician who inspects the car can say what is failing and why, so ask for that inspection in writing before you assume the problem is settled or hopeless.
Ask what the repeat problem would cost you
Once you see a pattern, the next question is what the next failure in that system would mean for your week and your household budget, not just the shop bill. A car that is out of service for days can cost more than the repair itself. Ask the shop what they suspect, how long a fix usually takes, and whether the same part is likely to fail again. Then ask the seller or the contract company whether that system is covered at all, and how the contract treats a problem you already know about. Get the answers in writing. A verbal yes at a counter is not a term you can enforce.
Read the contract before you rely on it
A pattern you have documented is only useful if the contract would respond to it. Look for a sample contract the company publishes, and read the coverage section, the exclusions, the list of what counts as part of the contract, and the cancellation and transfer lines. Providers that post a sample let you do this before you pay. You can see which ones do on this list. Read what the sample says, not what the sales summary says.
When the invoices show no pattern
If your repair history is a handful of unrelated bills on a car that otherwise runs, a service contract is a bet on the future rather than a response to a known problem. That can be a legitimate choice, but it deserves the same scrutiny as any other purchase. Work out whether an unexpected bill would strain your household, read the terms, and check how the published figures are gathered on the scoring method page before you decide. If the only urgency comes from the person across the desk, step back. The seller's deadline is not your car's problem.