1. Talk to others who are customers of the auto repair shop and see if they would recommend it.2. Check for ASE certification, AAA approved car repair shop.3. Get a second opinion. If you disagree with the estimate or diagnosis take it elsewhere.4. Look for a clean shop. A repair shop that takes pride in itself will do the same for your vehicle. But if is to clean be careful they may not be busy and have to much time to clean it should look used.5.Ask about shop equipment. If they are proud of it,and know how to use it they’ll be happy to show it off. Also a shop that has expensive equipment will have a higher quality employees. 6. Talk to your mechanic. If they are unresponsive then go elsewhere.7. Ask for your old parts to be returned you don’t have to take them home but be sure you see them preferable already in your vehicle when you pick it up8. Check the parking lot if it is empty( all busy shops have some vehicles sitting around waiting for parts or whatever) keep looking also look for cars similar to your own