2012 Need help ABS/Knocking noise front wheel

[sugarsuitepee88]

Hi.

I have a 2012 Chevy Equinox. I have a loud metalic type knocking noise in my left front wheel. Noise starts after about 30 mph and is steady whether turning or going straight. The noise started and the next day ABS, stabilitrak and traction control lights on, also 4WD turns off as soon as you start going. Its been to the mechanic TWICE and they "cant" find whats making the noise. Replaced the wheel bearing and wheel speed sensor. Took it back last week, they found nothing wrong and need to take it to dealer to have codes read which I think is a crock of poo.
Any idea of what we can check out ourselves? Im extremely frustrated at this point and dont want to keep throwing money at it for no reason.
Thank you.

 

[sugarsuitepee88]

If it helps anyone in the future...

Two unrelated problems. All lights were left front wheel sensor

Knocking noise is the floor pan heat shield. Looks like a bolt fell out and the shield is knocking on the exhaust.