Question about 2003 Jaguar S-Type

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2003 s-type 4.2 L V-8, restricted performance message, 62,500 miles. occurred coincidently with letting fuel level get to point where low fuel indicator came on. also went to different gas station than usual. local mechanic thinks it could be fuel pump. my first thought is change fuel filter and go from there. suggestions? just finished 2000 miles driving in last 14 days, car performed flawlessly on those trips.

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  • dspace Dec 10, 2009

    scanner gave codes for misfire on 6 cylinders, fuel pressure was 65 psi with fuel pump performance @35%. mechanic said that all other read outs looked normal.

  • dspace Dec 10, 2009

    from what i know about fluid dynamics if the fuel rail pressure is measured before the fuel filter and it is partially plugged that could explain why the engine might not be seeing the proper fuel flow to give optimum performance.

  • dspace Dec 16, 2009

    had fuel filter replaced and it appeared to be original although it was a motorcraft brand. car runs okay but after a short drive the restricted performance message appeared and the mechanic again hooked up to read fault codes. had a P0174, system too lean on bank 2; also P1582 flight recorder data is..
    this mechanis thinks it could be an O2 sensor which he says would be ~$500 to replace.

  • Ray Keckeisen May 11, 2010

    as i stated before the fuel pressure reading is too high,possibly caused by fuel pressure regulator being bad or the vacuum hoses to it, in any case change the fuel filter and have the fuel pressure tested again should be 43psi at idle,thanks and get back to me. Thanks Ray

  • Ray Keckeisen May 11, 2010

    you may also want a second opinion,fuel pump at 35% with higher than normal pressure,

  • Ray Keckeisen May 11, 2010

    sounds like the fuel pressure is way off, should be 43psi at idle,please give the specific codes

  • Ray Keckeisen May 11, 2010

    need the codes from the ecm to help, have the car scanned with a scanner capable of reading european cars,get back to me with the codes we'll go from there

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Posted on Jan 02, 2017

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SOURCE: restricted performance under load

Some times, it only takes a good cleaning of the Mass Air Flow Meter to get it working again. Also clean out the full air intake and down the throttle body, especially the butterfly flap. There are special cleaners for both the Mass Air Flow Meter, and the Throttle Body. Be sure to use the correct ones as there are special coatings that can be damaged by the wrong cleaners.

Posted on Apr 01, 2009

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SOURCE: Restricted Performance jerking while going up hill. 03 Sytpe

you would need fault codes

Posted on Jul 08, 2009

  • 1986 Answers

SOURCE: check engine light is on,display says restricted performance

Anything can cause the check engine light to go on from a loose gas cap, to a transmission issue. When the onboard computer detects an issue, it will restrict performance so as to not damage the engine any further. An Oil change won't affect this light. The only way to determine the cause of the light is to have the computer scanned with an OBD-II tool (Autozone does this for free) to determine the codes and cause for the light. You can also clear the light with the OBD-II tool, but if the problem is still there, the light will just come back on

Posted on Sep 16, 2009

michigan man
  • 3533 Answers

SOURCE: cylinder 8 misfire, restricted performance is also coming on

you may have to replace the cowl pack itself that sit on top of the spark plug and sometimes you can get by just changing the boot wish you the best of luck Michigan Man.

Posted on Dec 06, 2009

  • 1 Answer

SOURCE: 1 Red and 1 Amber warning light and message Restricted performance

Go to Auto Zone and ask the to run a diagnostic with their OBD-11 computer. This may still be a free service. Write down the error code/codes displayed. This should help pinpoint the correct sensor.

Posted on Jan 23, 2010

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S type year 03 car gave a couple of splutters going round a roundabout the engine warning light came on and the words restricted performance appeared . i drove the car home about 6 miles and it seems ok ,...


Get the codes read as it could be anything. The car will run with this warning up until the fault goes to the next level - then it will shut you down. Get the codes read as it may be something small like a sensor or even a bad connection - from the ''splutters'' it sounds like it may be fuel/air based. hope this helps-good luck.

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Cylinder 8 misfire, restricted performance is also coming on


you may have to replace the cowl pack itself that sit on top of the spark plug and sometimes you can get by just changing the boot wish you the best of luck Michigan Man.

Dec 06, 2009 | 2003 Jaguar S-Type

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Jaguar s-type restricted performance


I had the same problem. Restricted performance and running rough at 3000 RPM. I have an OBDII code reader and found that the problem was in the air mass flow sensor, which is just after the air filter. I pulled this out and found it was dirty and had butterfly wings in it. The last shop where I had the oil changed replaced the filter for me but put in the wrong size. Close but no cigar. Bought some *** Flow Sensor cleaner at auto store and fixed the problem. Get an OBDII reader with the ability to erase the codes. Comes in real handy.

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My mechanic said that the front cxygen sensors needed to be replaced on my 03.

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