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Thread: 1.9CDTI Oil 'Quality' Sensor

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    Question 1.9CDTI Oil 'Quality' Sensor

    I think I am correct in saying that the 1.9CDTI has an oil 'quality' sensor. (It is used if you are on the 20k 'Ecoflex' service schedule).

    Does anyone know if it is possible to 'read' the sensor and so gauge the quality of the oil? If this can be done in-car somehow then great, otherwise does tech2/opcom or do any of the cheap code readers allow this?

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    dont think it has a oil quailty, more a program built into the ecu that works out how hard you have accelerated, how many cold starts, motorway driving ect and then says you need a service. thats why you have to reset it manualy after a service.

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    There's no oil quality sensor. The engine computer predicts degradation of the oil by considering operating conditions of the engine (oil temperature, engine revs, etc). That's why you have to use specific oil if you use oil life monitoring, to ensure that these calculations are correct.

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    Vehicle : Jaguar XF 3.0D V6

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    It is a 'virtual sensor', not a 'real' sensor, as above

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    Not just the 1.9 CDTI, but will apply to any and all engines between 2002 and 2005 with ECO Flex option
    Equally, the ECO Flex can be switched off by TEC2, pretty much proving that it is the way in which the EMS works out and saves the data between service resets

    However there must be some form of oil quality calculation
    Mine is very accurate until there is about 10K miles left to next service, showing 20K miles
    It then drops quite dramatically, especially in the final 5K miles
    I suspect it uses the rate at which the oil flows and the oil retains heat

    Having just had mine serviced it takes a LONG time to heat up
    However before the service it was heating up very quickly (by comparison)
    That would be indicitive of all the contaminants in the oil, resulting in reduced lubrication and heat disappation

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    You can have it read via tech 2. I had my Signum read before it was serviced at 40k (2007 57 plate) and it was down to 15%.

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