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Hi. This is dead easy and doesn't need the electronic gizmo a garage uses.

First, undo the earth terminal and the battery, then the live terminal at the battery - be careful not to drop nut or bolt as it is a devil to find them ;-).

Second, hold the live and earth terminals (the cables not battery terminals) together for 10 to 15 seconds

Third, reconnect terminals to the battery

This resets the onboard diagnostics computer (OBDC) and wipes any errors from the memory. In the process, it turns off the engine warning light.

Just one point to consider. Reseting the OBDC wipes out all error messages, so if you have had other problems that would be picked up by a garage doing maintenance, there will be no record until the ODBC has rerun its checks, which could be up to 1000 miles.

This tip was given to me by an ex-Jaguar senior technician and helped when my LPG conversion kept upsetting the car ECU.

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Q: How do you reset check engine light on 2003 jaguar?
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