Washed the engine of the replacement Julies Jag. 2001 XJ8 Sport. Unfortunately the coil covers on one bank got damp inside and ended up with a misfire, then the warning light came on. Sorted the damp coils and plugs and running a treat again, but the warning light stays on, How do I reset it, tried lifting the battery for 10mins, still to no avail.

 

Find someone with an OBD II reader: a function there is resetting the check engine lights.

 

It will self-reset, if the fault has gone, after 3 warm ups.

 

If you own a jag, you WANT to own an obd2 reader. For basic drivetrain items, they
don't cost a lot. If you want to do SRS (airbags) they cost $$$. I had a transmission repair and the should couldn't clear the code even though it was fixed. I was able to
do it with my obd 2 reader. Start with a cheap one, eventually upgrade. $50 to $500 depending on how much you want to do.

 

+1
For simple OBD they start at $5

 

But then you need software.

The current bargain package would be the obdlink SX from scantool.net
because it includes a pretty good software package in the price of 29.95

ScanTool.net LLC - OBDLink SX USB Scan Tool - OBD-II Adapter | ScanTool.net - ScanTool.net

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Adequate software is FREE