Question about 2005 Jaguar S-Type

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The engine icon warning light has come on in my 2005 S-type 4.2 jag (50,000 miles). According to the manual, this means that something is likely wrong with the electronic control system for the engine. It happened once before, and the car went into limp home mode, but it has not done that this time. I have my car into a jag dealer, and he says the diagnostic for the engine controls has not revealed the source of the problem, but it does indicate many "faults". His solution is to begin trying mechanical solutions like installing a new vacuum valve and line, and if that fails, to "blow out" the the fuel injector lines. This doesn't sound right to me. I would expect that some of the sensors in the control system have gone bad. Shouldn't they be replaced first? The bottom line is what approach should be taken after the engine diagnostics have been run? Thanks, Bill

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  • bill2math Feb 02, 2010

    Sounds like the right way to go to me. I will get more details from my dealer.

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HI. I find it strange that the certified dealer technician cannot pull the codes properly. This is very strange, your car is equipped with a very sophisticated Engine CPU. The trouble codes should be accessible with the correct diagnostic equipment, and procedures. I suspect some sort of sensor failure. Normally, when a vehicles CPU initiates the limp mode, this will indicate that one or more of the monitoring sensors have failed. The technician, if trained well, should be able to extract the actual codes that correspond to the fault easily.

If the tech cant pull the codes, this will indicate that either the diagnostic port has failed, or the technician is having issues with the diagnostic equipment. You do not want to start throwing parts at this issue. This could become very expensive. I would recommend to have the codes pulled. Once the codes are pulled, this will isolate the actual problem area. Possibly a failed cam, or crankshaft sensor, or faulty connection as well.

If the diagnostic scan tool dose not reveal a trouble code, this will indicate that the actual Engine control module is the culprit(faulty CPU)

Posted on Feb 01, 2010

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