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Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 14128
Experience:  12 years at a Jaguar dealer as technician and shop foreman.
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Jaguar XJ8 L: My 1999 Xj8L warning light said enjine was in

Resolved Question:

My 1999 Xj8L warning light said enjine was in fail safe mode and didn't want to go over about 15mph. Any idea on what is wrong. Thanks
Submitted: 1 year ago.
Category: Jaguar
Expert:  Richard replied 1 year ago.
Hello and welcome to justanswer.com


Based on your description I suspect a problem with the electronic throttle system causing this. It is most likely a faulty in the throttle assembly which will need to be replaced. To be sure we will need the stored fault codes. A Jag factory tool is needed to read all the faults but you can try using a generic OBD II scan tool that can read the ECM only. I recommend a trip to your local parts store before visiting a dealer or Jag specialist shop. If no codes can be read then you need a Jag tool or the system needs to be scanned while the faults are displayed and it is most likely that throttle. You can try cleaning the throttle bore and blade to see if it helps. I suspect the code will be a P0121 and/or a P1121. Either way lets see if we can get a code number.
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 14128
Experience: 12 years at a Jaguar dealer as technician and shop foreman.
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Richard
Richard
Jaguar Mechanic
14128 Satisfied Customers
12 years at a Jaguar dealer as technician and shop foreman.