Honda crv whinning noise

I suggest you stop driving it and get it towed to a Honda repairer before you do serious engine damage. They will be able to diagnose the problem, which does sound fairly serious. Did you get a warrantee.

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find a real ASE mechanic, noise is not something web bunnies can hear. or find....
and finding it can be extremely dangerous ( i use a sonic ear 4 channel stethoscope) (can drive with head phones and listen to 4 microphones (clamps)
sad how you mech. gave up.; ; there is no need to . not ever.
did he hear it, then give up?
or did the not drive car, or what?
if they can't hear it, they can not fix it. so......

muffler explosion
#1 reason , EFI running rich as a pig (CEL glowing and warning)
and exhaust cracks, (adds air )
air + fuel = muffler explosion and can blow the whole thing to H3LL
pipes blast off. car.

This is probably the wear indicators on the brake pads,pull the wheels and take a look.(Toyota also designs the pad wear indicators to work in reverse,so they will continue to squeal louder and louder as the wear increases.)

if the noise only occurs at full lock then it is the pump clutch slipping which is normal.sounds awful but okay.

inspect the braking system for warped or uneven rotor surface, as this may cause this noise and uneven pad wear. CV joints also could cause this if the boots are torn, have insufficient grease, are damaged,or have worn bearings. Hopefully this helps

Why don't you believe your mechanic? He is correct.

from a local tyre and honda dealers, a growing noise at the back were caused by tyres profiles. According to them, CRV's come standards with certain brand ( Goodyear i think) and with certain size and certain profiles, so if you have got different ones at the back, it would create that noise. I've got myself honda crv 2005. hope its helpful.

IT IS ONE OF TWO THINGS.IT IS EITHER THE
CV JOINT OR THE WHEEL BEARING.