Question about 2003 Jaguar S-Type

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I HAVE A JAGUAR S-TYPE AND ON THE DASHBOARD THE STATEMENT RESTRICTED PERFORMANCE KEEPS APPEARING,CAN YOU HELP?

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This is a 'limp home' safety device. For example If you ECU gets a signal from a knock sensor due to a miss-fire the ECU will restrict engine performance to prevent any lasting damage until the causative error as been corrected. Do a good visual check. Check plugs, leads, disconnect sensor plugs and reconnect them. If automatic ensure that your transmission fluid is at the correct level. You can top it up one pint at time via the transmission fluid dip stick tube. Always check the levels with engine running in 'park'. If there is still restriction you will need the on board diagnostic report to read from the ECU. This will give you vital clues as to the cause of the 'restricted performance' measures being imposed.

Posted on Aug 24, 2010

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I am not familiar with Jaguars but if you call a dealer,they will tell you what it means for free.It is a pretty general term.Maybe someone else on here is familiar with Jaguars but when in doubt...ask the dealer.Good luck! Greg

Posted on Aug 24, 2010

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Posted on Jan 02, 2017

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SOURCE: the restricted performance light keeps coming on

could be numerous causes, it is logging a code when the light comes on, have the codes pulled to direct you in the correct repair

Posted on Jan 20, 2010

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SOURCE: 2003 Jaguar S Type R 4.2L SC. Check engine light

Rent a scanner, read out any code(s), and pursue to repairs. It may be as simple as bad spark plugs and wiring, or worse, fuel problems from the injectors back to the fuel tank. A worn O2 sensor can cause improper fuel/air problems.

Posted on Oct 21, 2009

  • 1 Answer

SOURCE: 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.

Posted on Mar 01, 2010

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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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