Explain fault code 2f4e roadspeed for e90 bmw

You can get help from the service and repair manual which you will get from the given link this manual will help you to locate and fix the problem on your own http://toolsnyou.com/

run the fault codes to see what put the engine light on
engine lights operate for engine faults and transmission faults
during the ac repair , a wire could have become disconnected
Consider it as a unrelated problem to the AC

Have you replace the fuel pump relay?

2007 bmw e90

You will need a scan tool that works on that BMW to clear any warning lights such as a check engine light. Unless you have resolved the problem/ fault that has caused the warning light you are wasting your time clearing it as an unresolved fault that has not been fixed will, once you drive the car again, generate the check engine light again together with a bunch of fault codes that can be read by the scan tool.

You may get lucky and find a non-dealership repair shop that can do the repairs, but the dealer is more likely to know what they're doing with that car.

depends on what engine you have if it's a strait 6 cylinders it's 6,5L.

if you have the n20 4 cylinders then it's 5L.

You need a jig to set the cam timing. It is a special BMW tool.

The timing is set by the engine computer. It uses the crank position sensor. There is nothing you need to do unless you want to change the mapping of the engine.

Don't see 320i listed in alldata not that code.