How to Troubleshoot a 1995 Audi A6 Quattro

1. Turn the key in the ignition to get your A6's instrument panel to engage. Look over the dials on the gauges and make sure that you have enough fuel to start the vehicle. If you don't have enough gas, fill the tank up and try to start the car again. If the instrument panel does not light up, you have a problem with your battery.
2. Open the hood with the hood release latch on the driver side under the steering wheel. Raise the hood and lock it in place with the hood rod. Check over the connections to the battery on the left side of the car.
3. Tighten the connections with a pair of pliers. Make sure that you don't have any corrosion on the battery cables. Clean the cables with soda and a wire brush to remove any corrosion.
4. Test the battery with a voltmeter to check its charge. If you have less than 11 volts running on your 12-volt battery, attach a battery charger to the battery terminals.
5. Leave the battery charger on the battery for at least 12 hours to charge the unit. Try to restart your car. If the car does not restart, replace the battery with a new one.
6. Locate the cooling system on the left side of the car if your A6 is overheating. This is labeled as 'Coolant.' Make sure that you have enough coolant in the system. Fill the coolant tank with 50/50 mix of coolant and water until it reaches the fill line on the side of the tank.