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There are things called memory savers, memory minders, computer memory keepers, etc. that you connect to the electrical system before disconnecting the battery. They keep the computers from losing their memories while you change batteries. Click on the related link below to see an example.
What else can I help you with?
Can you take off the negative wire on battery to test the alternator?
Yes you can take negative off on all cars and test it if it dies alternator is bad if car keeps running then its good. In older (not computer controlled) cars you can, but on some newer (computer control) cars is not recommended. Some newer cars will turn off even if the alternator is working good. Use a volt meter to test the voltage. Connect it to the battery and it should read a little above 12 volts when its off and 13 to 14 volts when its turn on. If the voltage does not go up, then the alternator is not charging.
What is a car data saver?
IT can be a device that keeps your car's computer powered while you perform a battery change. Newer cars have adaptive memory that would need to be re-learned otherwise. It also keeps your radio stations programmed and your clock time correct during a battery change. Another Device that it can be, is one that is plugged into your Diagnostic connector, to gather computer "data" and save it in hope for catching a glitch while driving for diagnostic purposes. Both are unrelated.
How do you reset the computer on 1995 Cadillac sedan deville?
this resets the computer in most cars. take the battery cables off the battery and touch them together your computer is reset.
Do cars need an o2 sensor?
Yes they do. All cars with a computer "80's and newer require an O2 sensor, it gives the computer the amount of air/fuel in the exhaust system so the computer maintains a 14.7.1 fuel ratio . Yes they do. All cars with a computer "80's and newer require an O2 sensor, it gives the computer the amount of air/fuel in the exhaust system so the computer maintains a 14.7.1 fuel ratio .
Is the battery low when the car control panel is dim when starting?
How old is the battery? How old is the car? Have the battery tested, normally free at most auto parts houses, at the same time have the charging system tested to ensure the alternator is charging correctly. If its a newer vehicle, a low voltage sensor on the cars computer will put it in "limp home" mode so dont keep driving if it keeps it up. New cars can have faulty batteries so start there first before you have someone tear into it wanting to change the alternator.
Can the battery in a 2000 Lexus LS400 be changed without going to a garage or dealership?
yes, but you need an adapter that plugs into the cigarette lighter. attached to the adapter is a 9volt battery. plug that into the lighter before disconnecting the cables to the car battery. that adapter w/ the 9 volt battery attached to it will keep just enough voltage in the cars computer system to allow you to change the cars battery. w/o that adapter when you disconnect the old battery and reconnect the new battery the cars onboard computer system will default and blow several fuses. go to an auto parts store and rent the adapter for a few bucks.
How to set your timing on a 1999 Ford Contour?
u cant most newer vehicles timing is controled by the cars computer
Why the cars doors won't open with keyfob?
The battery in the keyfob could be dead, or there is a programing issue between the keyfob and the cars computer.
Step by step on how to install a car battery?
Some cars make the battery wildly inaccessible. but if it is in plain sight all you need to do is disconnect the terminals (ground first) remove battery hold down clamp. remove battery. On many newer cars you will want to use a battery charger to maintain power throughout this procedure to prevent stereo lock issues.
Can newer cars jumpstart older cars?
Yes
How do you get a Land Rover Freelander 03 out of gear?
For most newer model cars you need the key to change the gear.
When a battery is discharged does this reset the cars computer when recharged?
When you recharge the battery and start the automobile the computer will set itself back to (ROM) read only memores. SOMETIMES you do need to drive a few miles for the computer can relearn itself.
