Question about 1998 Jaguar XK8

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1998 S-reg jaguar XK8 drives perfect until reverse is selected then goes in to reduced performance mode. using a fault code reader fault code P1646 and P0706 were read.

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  • mherman346 May 11, 2010

    Seems it may be just the transmission cable needs an adjustment, as I find this reference on-line:
    p0706 JAGUAR





    Jaguar XK8 Technical Service Bulletin S307-01: Selector Lever Cable - Adjustment Procedure - Not In Workshop Manual.pdf Taken from the pdf material: After replacing the selector lever
    cable or repairing a fault concerning range selection, such as DTC
    P0706 - Transmission Range Sensor Circuit, Range/Performance, the
    selector lever cable needs to be adjusted according to the procedure in
    this bulletin.
    The cable is adjusted by moving the locknuts that secure the cable
    sheath to the J-gate assembly. This movement will lengthen or shorten
    the effective length of the cable sheath between the Jgate and the
    anchorages of the cable sheath.
    Procedures covered: Adjusting of Transmission Selector Cable
    (including Cable Sheath Locknuts diagram & Transmission Lever
    diagram) of Jaguar XK series vehicle.
    This manual is available FREE at European Transmissions website The manuals state P1646 is ECM HO2S control malfunction ?
    Engine A bank heated O2 sensor which is upstream. It can be triggered when the
    Ignition ON > 8 seconds, When CK ENG MIL is activated
    (DTC flagged; second trip), ECM:
    ? Inhibits A bank upstream HO2S
    operation. Can be caused by these:
    HO2S heater failure,
    HO2S sensing circuit short circuit to
    ground or high voltage,
    HO2S sensing circuit open circuit,
    ECM failure
    I don't see any codes for P0706...but there is on-line this reference: I'd go to this site and read the info...http://www.europeantransmissions.com/Bul... Best regards, Michael

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  • 9 Answers

Seems likely it is just a transmission cable adjustment needed. Please see my whole note (not a musical whole note) above under Clarification...

I'd go to this site and read the info... http://www.europeantransmissions.com/Bulletin/DTC-jag/Jag/307-01.pdf

Best regards, Michael

Posted on Sep 15, 2009

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The fault is generally due to a problem in the Computer & Output Circuit area


Fault Description: ECM HO2 Sensor control malfunction -bank 1 upstream (1/1)

Action of ECM:- ECM Default:- HO1S 1/1 control circuit inhibited


After clearing the DTC, complete the Drive vehicle for 10 minutes
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