Ciilla

My 2013 xD is making a horrible screeching noise, kinda like a dying cat. Took it to AutoZone-
Codes all green but the guy said to take it to an electrical shop because it’s a relay.

Now please forgive me for I am car stupid but what does he mean, what could it be?

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DannoXYZ

belt?
alternator bearings?
AC compressor bearings?

Don't rely on scanners, they're just a start. ECU is really dumb and is at mercy of its sensors.

Pull out real measurement tools: voltmeter and vacuum-gauge. Stuff competent mechanics have been using for 100-years! In this case, a stethoscope will help track down source of noise.

Ciilla

Thank you.

I’m so nervous about taking it to a shop, so many horror stories about being over charged. Especially since I don’t know anything. Honestly dont even know where to begin. Like local shop or dealership- which is better?

DannoXYZ

Search around for local-shops specializing in imports.
Look at reviews on Yelp and Google. READ THEM. Sort by most-recent tends to be more useful.