If you are referring to a radio that has a security code, then you need to (a) know that code and (b) enter the code according to the instructions that came with the radio -different radios use different methods!
Disconnect the battery for a few moments. When it is reconnected, the computer should have reset. if this method is not successful then the car will need to be taken to an authorized dealer to be reset.
IT IS AN ANTI THEFT RADIO ! YOU MUST RESET THE CODE (usually 4 numbers ) IF IT NOT IN YOUR OWNER MANUAL YOU WILL HAVE TO CALL DEALER W/ VIN # TO GET IT !! KM Any time power is taken from radio it must be reset >>>>
It is very easy to reset the check engine light on a 2002 Volkswagen Cabrio. The negative battery cable can be taken off for one minute and replaced to reset the light.
There should be a 4 number code in your service manual
Changing a battery on a 2006 PT Cruiser is very simple to do. The battery terminal cables will need to be taken off and put to the side. After the cables are off, take the battery off and replace it with a new one.
The battery life for a Sony DCR TRV350 is about 90 minuets.They can then be recharged,takes over an hour, and is then good for another 80 minuets. You will not need to replace the battery for years if taken care of properly.
Usually the car must be taken to the dealer or a licenced airbag specialist. They have the correct tools to test and reset the bag and or sensors. But, first try disconnecting the battery on both terminals for 15 minutes and then reconecting this may reset the sensors.
Many current radios have an anti-theft device that if it is removed from power, such as the battery dying, prevent it from working. Your car dealership can probably tell you how to get it taken care of so that it works again.
Leaf springs can be reset, or re arched. They will need to be taken off and taken to a specialty shop that has the machinery to reshape the springs properly.
It probably is the best idea to remove the battery and keep it indoors on trickle charge if your not using the car for a while,it will keep the battery much happier.As to the car,it will not harm it sitting there with no battery,the clock wont work obviously! and if you have a radio with preset channels/memory,you will have to reset them when you install the battery,also if it has an anti theft code you will need to reset that,but most modern radios don't have that anymore as car security is so much better these days.I must stress though that you should top the battery up and charge it fully after you have taken it out,then charge it once a month,or it will die.You can get an Automatic charger that will keep it automatically fully charged and can be left connected 24/7 with little observation. The Audi being so old will have little electronics in it,it will not cause any problems to leave it with no battery.
If you've taken out your factory stereo and didn't replace it with a compatible unit, you may not be able to. From the factory deck, you press the info button a few times until you see "reset oil" and click enter. Simple as that really.
all lamborghini's have a radio except the superveloce editions which have had the radio taken out in order to conserve weight.