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Matt, Mechanical Engineer
Category: Jaguar
Satisfied Customers: 22894
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have an XKR convertible 2002 and the engine management

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I have an XKR convertible 2002 and the amber engine management light is on - I have topped up the coolant but it is still on. Should I still drive it? Also, before the light came on, when the car has warmed up after about 10 minutes, it is very jerky (feels like contaminated petrol) but could the two be connected?
Thanks - Gill


On any car if you get a check engine light or other fault light this typically means one or more of the sensors has failed or has a faulty connection.

The fault can be something quite simple and nothing that’s going to stop the car to something quite major that will reduce engine power and possibly stop the engine

The ECU senses this and may put the car into 'limp home' mode which typically limits the revs and the amount of power available. Usually the car is safe to drive for a short distance as the mode is intended is intended to get you home without incurring any engine damage

The quickest route to repair is to have the car plugged into a diagnostic machine which will read off the fault code stored in the ECU (providing the light is still on at this point) and indicate which sensor has failed or whether the fault is more serious.

You can do a very rough and ready check yourself by unplugging sensors one at a time and seeing if any of them change the driving condition which would indicate the most recently unplugged sensor is the faulty one. This method is not foolproof though and reading a fault code off is the better method.

and yes if its jerky to drive while the engine light is on its almost certainly related to that fault light

Customer: replied 1 year ago.
Thanks Matt - some good advice - I should say however that my ECU is not working and it has been difficult to find a replacement for my particular model. We have managed to find one and it is due to be fitted on Friday. This has affected me being able to use the sun roof and one of my chairs. How would this affect your comment that the ECU senses this and may put the car into limp home mode?


when you say your ECU is not working I'm assuming that you mean the body control unit as the engine ECU has nothing to do with the sunroof

the check engine light will be related just to the engine side


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Customer: replied 1 year ago.
Hi Matt - have just picked up my car from JagTech - the problem was oil in one of the plus and engine coolant which had leaked in another one - also coil needed replacing.