Top 20 2007 Jaguar XK8 4.2 Questions & Answers

it sounds like the lift mechanism/regulator has worn out or siezed and needs replacing

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Take a look at this video:

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Having a restoration shop and running several newer Jaguars I have seen similar situations. Intermittent multiple errors such as these can be caused by a low battery (or corroded connections) that "fool the computers". Also had a '99 XJ8 VDP have exactly the same issues over several months. Issue was a manufacturing fault in the sensors on the throttle body that caused the "limp home" mode - usually in stop and go traffic. Jaguar had an inspection and recall on the throttle bodies but that vehicle had gone through 3 different Jaguar dealers for service and none looked at TSB/Recall or performed the necessary checks on the throttle body. Tried cleaning the throttle several times (per Jaguar TSBs) but no change. Had to replace throttle body & problem solved (over 30,000 miles since then). Recommend making sure all air connections to throttle are clean and open and cleaning the throttle area to see if that helps.

On newer Jaguars (and other Al bodied cars) similar problems occur when the "ground" connections to the body become poor (usually through corrosion but sometimes through collisions). Connections may look perfectly normal but have high resistance. Careful when working with the connections - the posts are usually very loosely fastened to the bodies. Good luck.

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you may try adding a engine oil flush follow the instructions on the container if the lifter is blocked that may help but that engine at that model/year suffered with worn nicosyl coated liners which made the engine poor starting/noisy unless it has been reworked with cast liners

Jaguar XK8 Cars... | 57 views | 1 helpful votes

the electronic part of the unit ie. module is seperate from the pump unit and can be interchanged someone may have put a module from a different unit on to your pump motor unit ie, from a xkr which as a differant connector

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Is it the PSI specs good {30PSI?} If not u have to start w checking 4 vacuum leaks, oxygen sensors, get emissions test to get all other emissions read (HC, NOX, CO) All the readings will give the tech a path. U have to have the right amt of fuel going into the pump & regulator to get the right PSI too. Clogged exhaust? The possibilities go on. Good Luck

Jaguar XK8 Cars... | 22 views | 1 helpful votes

Could at either plug(corrosion) Most wires break close to the plug, Check voltage a couple inches back. Unplug it(if you haven't already) check it. If you have voltage at the brake switch and a couple inches back(probe the wire) nothing at the Shifter solenoid. I would run a new wire to it. Way easier than removing the console and dash to find the short. If you have other problem, I would be looking at the fuse panel .

Jaguar XK8 Cars... | 127 views | 1 helpful votes

Possible bad wire in motor so it opens up and stops motor after heating.

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I strongly recommend a repair manual if you DIY. Auto parts store may cary or try or

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The light will go off only when the fault in the ABS system has been repaired.

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goggle jaguar error codes gives a full list and an explanation

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You've done most of the steps I would have so far... Now use a meter and trace the wires backward. Sounds like a broken or chewed up wire along the route backwards. Also try a separate wire with power to see if you can deliver power to those lights. If they work, albeit temporary for the test, you grounds are good. If one works and the other does not, then THAT ONE has a ground loss. In any case, you have it narrowed down, and I would hope that by now you may have your answer. Let us know so we can share our knowledge with other readers. Thank you!

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Un hook battery and let sit for 30 minutes with no power. This should let the capacitors bleed down and reset the code. It probably has a lost power code that is being retained memory.

I’m happy to help further over the phone at

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DSC stands for Diagnostic Service Code. Does vehicle have problems requiring service?

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Driving Range or Distance you can go at average mileage and amount of fuel in the gas tank. One of the items that will display if you poke one of the buttons to the right of the top of the speedometer.

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this is a common prob what was the fault code logged ?there are 4 sensors on these cars 2 on each bank upstream and downsteam the issue is the ecm tries to compensate for one bank that is out of limits using the fuel control of the other bank to try and keep overall emissions within limits.this makes diagnosis difficult without proper diagnostic the last count genuine jag. sensors are EXPENSIVE and cheap pattern ones are not that good.advise. find someone with jag diagnostic equip. identify the problem

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I would think that your vehicle has a voltage regulator built into the alternator, but I am not sure. I do not have alot of Jag experience. But this sounds like what your problem is. The voltage regulator is stuck and making the alternator put out full charge and wreaking havoc with your electrical system.

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Need a lot better description here ,sorry but without more input like that robot film,and without it i cannot help

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