Would a half tank of 87 octane gas cause the "Restricted Performance" warning on 1999 Jaguar XK8

If that does not cause the warning to appear what could be the problem

Asked by for the 1999 Jaguar XK8
if i remember correctly, jaguar usually runs a higher octane fuel. it has something to do atmospheric pressure inside the combustion chamber. it may cause the sensor to over react. shouldn't be a prob. but recommend upgrade air intake to higher air flow system if using a lower octane fuel. even just a high air flow filter.
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Should not cause warning. I would have it checked out asap so not to do more damage if there is a simple problem now. Call 313-562-7022 or schedule on the web at We will be happy to help you out. Larry