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it has been on for about two years when ignition is on

I replaced the battery and the alternator. the battery light comes back on. i have a friend who has a computer check system but only goes up to 2005.

was driving down the road last night and it just stopped working

After replacing head gaskets on 3.5L H.O. it will misfire backfire and start hard . I changed plugs (one had bent electrode )to no avail before I put it together I cleaned throttle body but did not spray cleaner directly into the throttle body I also double checked timing. when I throttle it I hear a lot of air is this normal?

I put it in 4 low (trans in neutral). I heard the clank as it went into low. The low light blinked and then went out completly. Then the service 4wd light came on. It is low and I have no lights on my selector switch. The 4wd fuse is good. I have tried a different switch and 4wd module with no results.

urn off start again then its fine but start gradually starts slipping again

urn off start again then its fine but start gradually starts slipping again

Below is a list of recommended repair work that the dealership said I should get done in the near future. Which services should I address immediately?
- Fuel System Service - Carbon removal
- Radiator hoses and cap 1.8 mileage, age, p/m
- Brake Flush P/M Mileage
- Replace right steering stop and cap - missing .4
- Front trans air dam and bolts/nuts - missing .5
- Front engine under cover with j/nuts, bolts and clips - .3 missing
- Left Fuel Tank protector, clips and nut - .3 missing

Thank you.

My 2001 540i had trans. problems. The trans fail/safe warning would come on, i drove it like that for a lil while. when i turned it off then on it would run normally for a few miles then pop back the failsafe and i would immediately lose performance but would still move. then eventually it got to the point were my trans. wouldnt perform it would sit when in gear engine idling and barely crawling forward. replaced the trans, Now the car wont start! the car cranks but wont start. Help me out here, anyone.

My 2001 540i had trans. problems. The trans fail/safe warning would come on, i drove it like that for a lil while. when i turned it off then on it would run normally for a few miles then pop back the failsafe and i would immediately lose performance but would still move. then eventually it got to the point were my trans. wouldnt perform it would sit when in gear engine idling and barely crawling forward. replaced the trans, Now the car wont start! the car cranks but wont start. Help me out here, anyone.

My 2001 540i had trans. problems. The trans fail/safe warning would come on, i drove it like that for a lil while. when i turned it off then on it would run normally for a few miles then pop back the failsafe and i would immediately lose performance but would still move. then eventually it got to the point were my trans. wouldnt perform it would sit when in gear engine idling and barely crawling forward. replaced the trans, Now the car wont start! the car cranks but wont start. Help me out here, anyone.

Need to replace engine, any rough estimates?

PUT ALTERNATOR ON IT PLUGS AND WIRE

New t-stat has been installed but same symptoms have come back.

changed thermostate changed coolant and still over heating the motor is good no ticking