YouTube actually has quite a genre of vehicle diagnostic experts. It's not uncommon to come across a slew of error codes that are really the emergent property of another undiagnosed failure. It can be quite theraputic to watch the diagnostic process.

One that comes to mind recently is this one from ScannerDanner and a Chevy truck:

https://youtu.be/k_KJuqR1gKQ?t=1m50s

And another from Pine Hollow Auto Diagnostics:

https://www.youtube.com/watch?v=Vv79lQ64DGA

I definitely enjoy the process these guys follow.