Lost key will I need to go to the dealer and if so how much will it cost and how long will it take?

From the 2004 owners manual...

"Replacement keys
If your keys are lost or stolen and you don’t have an extra coded key, you will need to have your vehicle towed to a dealership. The key codes need to be erased from your vehicle and new coded keys will need to be programmed. Replacing coded keys can be very costly. Store an extra programmed key away from the vehicle in a safe place to help prevent any inconveniences. Please visit an authorized dealer to purchase additional spare or replacement keys."

You need two functional administrative keys to program a third otherwise you will need the services of an automotive locksmith technician or have it hauled to a dealer.

You don't give any car details so I'm not sure what to advise. The cost is probably in line with most modern cars because all ignition systems have to be recoded to any key change. Only the dealer has these codes.

car the dealer get a new key

You can get one cut at the dealer for less than $20 for most vehicles if it is not equipped with a key fob built into the key. It will take about 5 minutes once you get your turn at the dealers parts counter.

if you had the keys there are several places to get one cut, but as youve lost them only the main dealer would have the right key for that model.

cost depends on whether yours had a chip in it.if your ignition key was metal only, the cost not very much.if the end had a plastic peice on it and you could unlock your car with a push button and it had a panic button on it, then about $75.00 from dealer only. you will need to take your vehicle registration and cars vin# and photo i.d. to get a key. i would call the nissan dealer and ask how much and if they have to order it. that happens sometimes.thank you for choosing fixya.com

if u notify dealer with vin number they should be able to cut u a new key --if ur key had a electronic chip in it still would need to notify dealer ----if u want to replace ignition switch the switch runs about $130 if electronic more -then u need to add on the price of installing it $65-75 an hour labor cost-- some not many lock- smiths do automotive ignition keys [non electronic ] from vin number

You cannot disable the immobiliser. If it were that easy, any car theif could defeat it by searching the internet. If you dont have any more master keys, you will have to have your local Toyota dealer reseed (reprogram) the immobiliser code, and program new keys for you. It should be about 2 hours labor and cost of keys, but only a dealer can do it. They need to use the Toyota scan tool, and access a Toyota only website with security codes.

These keys have inbuild sensor in them these can be made by the dealers only or you need to replaced the whole locking unit which will cost you more , So its good to contact the dealer ,it is the problem BMW you need to contact them and prove the car is your and run through lot of process and there no other local lock snith on your car ..................