Question about 1998 Jaguar XK8

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Err message on heater panel

Hi my XK8 will start up OK but none of the dials are showing readings (petrol, rev count, battery charge reading, mileometer) and an Err message appears on the heater screen. Also, seems stuck in park and won't go into drive. Does anyone know what this could be?

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  • laura_tuson Mar 03, 2009

    Thanks, yes did all that. Eventually recharged the battery fully (disconnected and reconnected) and seems to have worked - for now, anyway! Thanks.

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  • 319 Answers

Have you checked fuses? Sounds like the fuse controls the dash and the trans shif interlock. check both underhood fuse panel, and the in-cabin fuse panel.

Posted on Mar 03, 2009

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There are two main possibilities here.

1) The battery is flat because it is no longer holding a charge. The ability of a battery to retain a charge will diminish over time. In this case a replacement battery is needed.

2) There is a problem with the alternator which is not supplying charge to the battery when the vehicle is running causing the battery to be drained over a period of time.

You can test for both of these using a multimeter and this is very easy to do.

1) With the meter set to the DC scale and attached to the terminals of the battery (Red lead to Positive, Black to Negative) and with all accesories turned off - you should have a reading above 9.6 volts. If the reading is less than this the battery is faulty and needs to be replaced.

2) If the reading is above 9.6 volts, you need to get the car running in order to test your alternator. You will need someone to rev the engine whilst you connect the meter to the battery. With the engine at a fast idle, and all accessories off, the voltage on the meter should read around 14 volts (13.5 to 14.4) showing that the alternator is producing a reliable charge.

Anything less than 12 volts with the engine running means the alternator is at fault and it is the alternator that needs to be replaced not the battery.

You can also test with accessories on (heater, lights etc,,) The reading should still remain around 14 volts with these extra drains on and the engine at fast idle. Anything less is an indicator of a faulty alternator being the cause of your problem.

Hope this helps. Thanks for using FixYa.

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