2001 Subaru outback 2.5 litre engine surge and "Tock" noise from under passenger side

most four wheel drives do not spin both front tires other wise you would hop around corners,that being said you should be able to stop the spinning side tire by holding it in place ,do this before the tire starts spinning ,then the other side should spin.if not you have a problem start with the axle and work your way back in the drive train,simple process of elimination..the grinding noise sounds like a broken gear tooth in the tranny.requires tear down and replace gear.take it to a professional.hope this helps

If you believe it is the highbeam indicatore just try using the switch to change it to low beam and it may go off other wise it is probley just an indicator that your daytime running lights are on.

check your transmission fluid level may be low.

It just all depends on the fluid level. It probably needs changed around 50,000-60,000 miles. Sometimes, the dipstick is under the car. It is not an actual dipstick. It is much smaller but it is located on the side of the transmission. I would check down there to see if it is on the side.

most fuel pump relays are located in the main fuse box,under the hood. look for a black box on the drivers side,or passenger side fenderwell under the hood. lift cover off and look on underside of the fuse box lid for location of the fuel pump relay and main engine fuse.hope this helps and thank you for choosing fixya.com

Have you checked your starter?

its not too bad a t least you can see it

(1) Disconnect connectors and terminal from
starter.
(2) Remove bolt which installs upper side of
starter.
(3) Remove nut which installs lower side of
starter, and remove starter from transmission.

If I understand you correctly, you feel a vibration it the brake pedal when you apply the brakes. Is that correct?
Have your brake rotors re surfaced; they are warped.

"engine makes cavitating noise" ....what does this mean?

Hello, from your description it sounds like your front differential has, for lack of a better term, exploded! the grinding noise is the ring and pinion in the front differential trying to turn w/ the rest of the transmission but most or all of the gear teeth have been broken off. There are 3 sections of your transmission: the front section which is the front differential, the center section which is where all of your main clutch packs and planetary gear sets are, and the rear section which houses your tranfer clutches. Your front differential contains gear oil and the center and rear section contains auto trans fluid. You need to check your front diff fluid, this is the fluid that is most likely covering your undercarriage. Usually this concern can be repaired as long as the damage isn't to great, but to assess the damage the transmission must be removed and pulled apart. Here is a diagram of where to find your front diff dip stick.
The dip stick is located on the opposite side of where the transmission fluid dip stick is. It's yellow and you have to be standing on the passengers' side of the engine compartment, make sure the engine is cold so you won't get burned, not that you'd be driving it anyway. You must reach down just behind the bell housing on the side of the transmission itself and just lift straight up. I hope this info helps...(subytech1)...

Have you recently had any service work done? I only ask because I know when replacing spark plugs or doing other svc work it was common to disconnect the washer tank an pump to complete the service. so check an make sure the green connetor is conected to the pump on the side of the tank. And the fuse box is under the hood on the pass.side near the rear of the engine. let me know what you come up with!