[x-type] Code interpretation

What do code - P1316 & P1647 mean?–
Serious
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In reply to a message from Serious sent Sat 29 Jan 2011:

P1316 Misfire Rate Exceeds Emissions

P1647 Linear O2 Sensor Control Chip (Bank 2)–
The original message included these comments:

What do code - P1316 & P1647 mean?


Paul Taylor 1993 4.0 XJS Convertible, 2004 3.0 X-Type
San Diego California, United States
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In reply to a message from Paul Taylor sent Sat 29 Jan 2011:

Hi Paul,
Thanks for your response. I did not mention the reading applies to
a 2000 XJ8.
Would this cause all 8 spark plugs to misfire?
Thanks.–
Serious
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