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[Colin Pearson]

Hi All, my 52plate s-type has onboard engine management light on and restricted performance light too, so was told it could be knock sensor so changed coil packs and put in new platinum plugs. The knock sensor that was sent out they got wrong twice so never got around to fitting a new one. What else could be wrong, don’t want to waste time and money if it’s going to break the bank.                                                  Thanks in advance

[The Voices]

Read the fault codes, this should give you more information rather than just replacing parts ?

[Colin Pearson]

This work was all done on advice from a jag specialist and after several error codes. Others are saying it’s still a fuel problem but it doesn’t point to that. If all the error codes are rectified then it must be something else right? 

[The Voices]

It 'could' be any number of things ?

I would try a different 'specialist' with better diagnostic skills perhaps ?