Just bought 2011 jaguar xjl battery fault on low coolant fault gear box fault,suspension all way to ground . Help

 

Use a voltmeter to determine the available voltage across the battery terminals with the ignition in the OFF position for at least thirty minutes. There should be a minimum of 12.6 volts available. If not, try charging the battery for five hours at 2 to 5 amps and retest. If the voltmeter still shows less than 12.6 volts, the battery must be replaced.

Many random DTCs and instrument cluster warnings are the result of a failing or weak battery.

 

Was the car healthy when you bought it?