We don't have a lot of complaints on file for the Jaguar XJ40 (although feel free to add yours here) -- probably because it's so old, no one bothers to post complaints anymore.
The 1988 Jaguar XJ40 has the most complaints, & the most-reported problem is also with the 1988 XJ40 for water leaks inside car.
Worst Reported Problems with the XJ40
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Latest Owner Complaints About the XJ40
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water leaks inside car -- 1988 XJ40:
blower motors would get damaged because the water ran onto them under the dash. Front carpet would soak any time it rained. Leaves and dirt would clog the drain plug which has a duckbill attached to it. the duckbill would collect the leaves and water would back up into the car. Cleaned out ... Read more »
This problem has been reported 1 times by other 1988 XJ40 owners.