My 2008 Volvo s40 i cleared 2 codes out now the security system wont let me start the car or even open the windows and most of the time it wont let me turn the key to the off position to take it out

SOURCE: 2000 volvo s40 cannot remove ignition key

The swich that you press when you want to change the gear mode("p" to "d" ) remain jam very coomon for an s40 spary silicone spary on it to remove dirt from there

SOURCE: 2001 Volvo S40 missing key/remote

You car has an integrated key and remote.

There is a software that needs to be downloaded to the car. When the remote is purchased at the dealer it comes in a plastic package. That plastic package has a sticker on it. The sticker contains id codes.

There are two codes one is 16 digits/letters and the second one is 8 digits/letters.

Without this sticker the dealership can not program the remote/key to the car. If you buy a key elsewhere, make sure it has the codes included.

Unfortunately you cannot program a remote yourself.

SOURCE: Car won't start

Your immobilizer is enabled. Try locking/unlocking the doors with the remote five (5) times, this should remedy.

SOURCE: Car won't start

If there is a blinking car icon with an "X" over it. This icon means the Immobilizer has been activated and hence won't allow the car to start. It could be due to a bad SCU, Start Control Unit. The SCU is actually the ignition switch on these cars.
Most of the time it's triggered by the anti-theft system..You can try this trick i learned that the dealers won't tell you...try locking and unlocking of the doors five times with the remote to reset the immobilizer and see if this helps.
Good luck...i hope this helps...please take a minute to rate me a fixya.

SOURCE: How do you reset the check engine light on a volvo

The Check Engine light has nothing to do with changing the oil. The light is on because there is a problem with the emissions system. Even if you reset the light it will just come back on unless the problem causing it to come on is repaired. You will need to have the ECU scanned with an OBD2 scan tool. That tool will retrieve the code that has been set by the ECU. The code will tell you what part is being effected, but not necessarily what part or parts are defective. To determine that takes training, experience, and diagnostic skills. I suggest you seek professional help. If the engine is running fine there is no hurry but if it is not running as it should, then do not put this off.