Volvo V70 XC Questions

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2001 V70xc AWD Cross Country Transmission will hang up in a high gear when car gets hot. The gear display will go from "D" to a "-". Car will still drive but when stopping, it is like starting off in 4th gear. Turning the car off and restarting it will reset it temporarily but will soon hang up again. "Transmission Service" message is on all the time as well as "Engine Service" message. Will replacing the transmission computer solve this issue?
Over last 2 weeks have had a stall and lack of power issues with my 2000 V70xc. Ran a scan and got these codes:

P1618 fault in lead between AW50-52 and Motronic 4.3
P0722 Output shaft speed sensor, circuit no signal
P1633 vehicle speed signal
P1238 turbo control valve

What are some possible causes for all these codes and is it an easy fix?

my question was when I get in the car and back out of the driveway when I step on the brakes it sounds like air coming out
it happens everytime I get in the car and back out to the main rd but after driving for about 5 mins the sound goes away
after how many miles should a turbo be replaced
at first i had 2 codes 1 for mass air flow turbo control valve I replaced mass air flow.When first start up for first half mile ok then will shut off wile driving start in up some times give it throttle it will die sometimes go very easy to get back to were you were may take restarting 5to10 times to get there
I plan to DIY and need simple solution.
I've only owned it for 4 months so I'm not sure about past maintenance. I replacedthe coils and spark plugs when iI got it. I felt it sputter a few times, like a misfire, so I took it to my Volvo mechanic. He told me the only issue he could find was low/dirty oil. So we did an oil change. It is still having the same issue. When I get on the freeway or speed up to go around someone the engine struggles and the check engine light flashes. City driving is perfect. I do get electrical fluctuations when I use my AC, so I stopped using it, but I still get the shaking on acceleration. I was thinking if I can get help in the forums I can tell my mechanic specifically what to fix so my car doesn't die. I love my car. Its been my dream car for the past decade.
Any idea of the torque settings for the brake callioer brackets and the allen bolts for the brake calliper please?
I would like to change it my self
If I am driving on a flat surface initially it will be fine but once I accelerate up a hill it shudders or bucks almost like it isn't getting enough gas. If I put on the cruise control, the problem seems to disappear. After driving a bit, the problem is present even when idling at say a light. I have taken it to numerous mechanics as well as to the volvo dealership. The dealership said it MIGHT BE a new electrical harness $1400. I responded that $1400 for a might be was a little harsh. Any thoughts or similar experiences out there?
stopped at my mechanic turn it off for one hour, when re-started it everything was working normal, except in the message window appeared "SRS airbags service urgent" What could it be?
Car starts and reves OK. Reverse do not engage from P. Only from D. In a few moments all gears are quitting. Motor reves OK but no forward or reverse movement. After shutting off it goes through same routine...
Soon as I poor water in to the overflow canister it runs out at the back of the engine near the firewall.
replace high beam relay
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