"Can I get a written estimate before you start?"
A trustworthy shop gives you a written estimate and won't exceed it without calling you first for authorization. That single agreement prevents the most common dispute — a final bill far larger than the conversation in the lot. If a shop resists putting numbers in writing, that's your answer.
"How do you charge for diagnostics?"
A diagnostic fee is normal — figuring out what's actually wrong takes time and equipment. What you want is transparency: a flat diagnostic charge stated up front, and ideally one that's credited toward the repair if you go ahead. Be wary of "free" diagnostics that turn into a long list of urgent, unrelated work.
"What parts will you use — OEM, aftermarket, or used?"
There's nothing wrong with quality aftermarket parts, but you should know what you're paying for. A good shop tells you the options and the price difference rather than billing OEM rates for cheaper parts. Ask, and you'll quickly learn how straight they're being with you.
"What's the warranty on parts and labour?"
A confident shop stands behind its work with a clear warranty on both parts and labour, in writing. A repair with no warranty terms is a gamble — and a shop that won't commit to one is telling you how much it trusts its own work.
"Can I see the old parts and what was done?"
Offering to show you the replaced parts, or to walk you through what was done and why, is a hallmark of an honest shop. Reluctance — or vague answers about work you can't see — is a reason to slow down and get a second opinion before paying.
Frequently asked questions
Should an auto repair shop give a written estimate?
Yes. A trustworthy shop provides a written estimate before starting and won't go beyond it without calling you for authorization. That protects you from a final bill that's far larger than what was discussed.
Is a diagnostic fee normal?
It is — diagnosing a fault takes time and equipment. The key is transparency: a flat fee stated up front, ideally credited toward the repair if you proceed. Be cautious of 'free' diagnostics that lead to a long list of urgent, unrelated work.
What's the difference between OEM and aftermarket parts?
OEM parts are made by or for the vehicle's manufacturer; aftermarket parts are made by third parties and vary in quality and price. Quality aftermarket parts are often fine — what matters is that the shop tells you which it's using and doesn't charge OEM prices for cheaper parts.
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Last updated 2026-06-29