OBD2 Scanner Reader Bluetooth Wireless Auto Diagnostic Scan Tool for iOS & Android for Performance Test Bluetooth 5.4 Car Check Engine Car Code Reader, Clear Error Code Live Data Reset Exclusive APP

If your primary concern is lying mechanics, get an ODB2 scanner from Amazon. You plug it into your car beneath the steering wheel and it diagnoses whatever issue the vehicle has. Some use phone apps, others work on their own. If you’re comfortable, you can look up videos on how to do the work yourself. Same thing mechanics use. I’ve been doing my own mechanic work with it for the past year. Just changed my transmission fluid last week. Just make sure it’s compatible with your car. Here’s the one I use: https://a.co/d/0dO30AY6

This one is really good https://a.co/d/0fEFh9Z6