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BMW 525i Questions

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Some one may have tride to break in the car how can I reset the secerty and start the car
My battery was recently replaced in my 525i (a couple months ago). Earlier this week, I tried to start my car, and it sounded like another dead battery. It finally cranked, but when it did, multiple messages appeared on the screen, including transmission failure, break system failure, and passenger airbag failure. Also, after the battery was replaced, my passenger power seat no longer works. We took it in to the BMW dealership, and they replaced the CAS (?) for $800. That did not work, and now they are saying that the KBM module needs replacing. The car is doing the exact same thing it did before the CAS was replaced - it has trouble starting and a transmission light is coming on (won't let me put into drive). I really don't want to have to continue paying for what seems to be guess work. Any suggestions?
right now iam useing the door key and it keeps going off can i set it so its not going off when a car drives by and wher is the adjustment for it thank you with your help
The car is a 1980 BMW 528i with a 6 cyl. engine. The white smoke only seems to come out when i rev the engine, not during normal driving. It also has a manual transmission.
The car knocks most when it's been sitting for a long time turned off. This is usually when it is most likely to shut off when I come to a stop and am not in gear.

The car also does not seem to accelarate as much in the lower gears (1-3) as it did prior to this problem.

The check engine light also recently came on.

I recently had the car serviced to repair a leaking oil pan, so I'm not sure if the two problems are related.
checked the fuses and they appear to be fine. everything else works
pulled a code from auto zone p0455 what does mean
coolant level message received, but level is up. not sure of ratio of water to coolant. gauge reads approx 25% highway / up to 45% city. never reaches over 50% position. no leaks found. no steam. no smell.

any ideas?
when car is on constant heat by feet of driver & passenger need to have air conditioner on
when I start the car a strong gas smell hits the drivers side lingers on for about 15-20 minutes have to have all windows open in the car
thing is i think mine is clogged and backing stuff up in the engine causing over flow and leaks,tell me if i can leave it off and drive it till i an get a exhuast pipe fitted in its place.
AC BLOWER ONLY BLOWS LOW SPEED - WILL BLOW HARD ON DEFROST FOR A FEW SECONDS THAN SLOWS TO LOW SPEED
My control panel has gone blank. Car still runs but radio not working
car ran great when 1st purchased, decided to balance tires and rotate. problems started. front end alignment with all new bushings and arms.....no fix...now all new shocks with everything replaced..still have problems..my manual says says 15" wheels....have 17's.. could this be the problem?..help as this car is going to be my daughter's
it is a two piece driveshaft
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