How to Reset the Computer on a 2004 Jaguar XJ8

by Richard Rowe

James May might have been taking a swipe at fellow Top Gear presenter Jeremy Clarkson when he said this: "Within one generation, men have been reduced to feckless, bed-wetting, Parmesan-shaving imbeciles who revel in their own uselessness." In his own show, Man Lab, May endeavors to a noble task: restoring to his fellow man the skills, the wisdom and the inventiveness of our vaunted forefathers. So, fear not -- having augustly changed the oil or performed some other vital service on your Jaguar XJ8 -- you may soon repose warmly in the knowledge of a job well and completely finished after resetting the service computer.

Step 1

Start with the ignition key in the "O" -- ignition off -- position. Press and hold the rear fog lamp switch.

Step 2

Press the "Start" button -- as though trying to start the car -- without putting your foot on the brake; this will put the car into "Power Mode 6." Immediately release the fog lamp switch.

Step 3

Press and hold the computer display cycle switch, then press and hold the rear fog lamp switch again. Continue holding the two of them while the system resets.

Step 4

Look at the display. If the process has been successful, the message center will display "Resetting Service Mode" for 10 seconds. After that time, it will read "service Mode Reset."

Step 5

Release both switches and remove the key from the ignition.

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