Question about Jaguar S-Type

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2003 xj8 jag

Engine light and restricted performance light keeps coming on. what does this mean

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It's true there are a lot of possible causes with a Jag going into restricted performance or fail-safe mode. The throttle body is a common cause and will cost an arm and a leg if diagnosed as the culprit - look for a second hand item from a wrecker for 20% of the cost of a new one - lots of jags get trashed with few miles on the clock so this is a good option. Some other potential issues are fuel quality - dirty or lower than recommended octane level fuel will register a fault so try 98 octane from a major brand and see if there is an improvement. Another potential issue is a faulty coil. Unlike your average car that has 1 coil your lovely V8 Jag has 1 for each plug. It is very difficult to determine if 1 of them is faulty so many dealerships will recommend you replace them all at the same time. With 8 titanium plugs and 8 new coils you could be up for a couple of grand - but nobody said owning such a beautiful car would be cheap or painless.

Posted on Sep 16, 2014

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It could be many things, usually the throttle body will cause most of the fault displays your talking about.You need to get the car scanned to pinpoint the issue.

Posted on Apr 15, 2014

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Posted on Jan 02, 2017

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SOURCE: restricted performance under load

I had the same problem on my 1998 XJ8. My dealer told me it was the Mass Airflow Meter, which needed replacing to the tune of around $500. After a second opinion at my local Jag mechanic, it turned out to be a hose that was broken on the lower part of the front of the engine. Check the vacuum hoses for breaks or loose fittings.

Posted on Mar 16, 2009

  • 5 Answers

SOURCE: 2001 Jaguar XJ8 Idles rough while sitting

o2 sensors often cause a rough idle at stand still. Previously my xj8 had crank case ventilation (pvc valve essentially) issues that caused the check engine w/ restricted performance. I noticed a severe drop in gas mileage as well. Jaguar dealer fixed my problems in a few hours and it was surprisingly cheap. Its worth taking it to advanced or auto zone to see what the computer says. Then decide if you want to shell out for a dealer fix or if you can tackle it yourself. BTW, just to justify myself this is my third jaguar. I have a '94 xj6 with a chevy 350 inside it, previously owned a 95 XJ6 and currently have the xj8. They are wonderful cars if you can put up with their rough times.

Posted on May 03, 2009

  • 179 Answers

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

you would need fault codes

Posted on Jul 08, 2009

  • 82 Answers

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

  • 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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1 Answer

I have a 99 jaguar xj8 van den plaus edition. It says resdtricted performance when it Gets warm and check eng. Light stays on. I replaced the computer any ideas


For the money you spent on another computer, you could have brought your car to a qualified mechanic and had the problem correctly diagnosed and repaired. 'Restricted performance' meant the computer saw something wrong in the engine, and restricted the performance to keep from destroying the engine. You killed the messenger and still have the same problem.

Dec 07, 2016 | 1999 Jaguar XJ

1 Answer

Why is my jag misfiring?


if the wires are on the right plug then you could have injector problems. when you changed the plugs did you gap the plugs to specs as if they aren`t then it can cause this problem. you could also have one or more bad ignition wires.

Aug 24, 2014 | 2001 Jaguar XJ8

1 Answer

P0353


Happens a lot. Always use the best high octane you can find. Check wire connections to knock sensor (most common cause for 'restricted performance light, sometimes outside temperature plays a part). Then disconnect negative terminal from battery, wait 2 minutes, reconnect. Then take car for a drive in various conditions, like city traffic, highway driving, and more. After several restarts, mine went away. Occasionally comes back, then disapiars. Ignore orange engine light.

Apr 15, 2014 | 2001 Jaguar XJ8

1 Answer

Engine management light on ,car still runs perfect


check for fault codes in ecm at a guess knowing this model well it will have logged a code for heated oxy sensor faults sometimes you clear the codes and they dont come back.if the light comes back then one or more sensors are faulty more than likely open cicuit heater element in the sensors there are 2 or 4 sensors on that engine depending on market spec. the norm is 4 you can compare the sensors with a multimeter to locate the faulty ones ideally you need a wiring diagram to do this. genuine jaguar ones are expensive i have changed all 4 in the past to cure this problem at a cost off over 1000 pounds the other likley causes are throttle body problems and air leaks but you normally get restricted performance warning showing hope this helps been a jag tech for almost 50years

Mar 25, 2013 | 2001 Jaguar XJ8

1 Answer

The restricted performance light keeps coming on usually when the engine gets warm ? this is a jaguar xj8 3.2 sport 1998 model


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

Jan 17, 2010 | 2001 Jaguar XJ8

1 Answer

Jaguar XJ8 Restricted Performance Light


check ur air filter and flow to motor

Oct 24, 2009 | 2001 Jaguar XJ8

5 Answers

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.

Oct 20, 2009 | 2003 Jaguar S-Type

1 Answer

2001 Jaguar XJ8 Engine Light/Stuttering


have you checked the o2 sensors on your exhaust

May 28, 2009 | 2001 Jaguar XJ8

2 Answers

Restricted performance under load


I had the same problem on my 1998 XJ8. My dealer told me it was the Mass Airflow Meter, which needed replacing to the tune of around $500. After a second opinion at my local Jag mechanic, it turned out to be a hose that was broken on the lower part of the front of the engine. Check the vacuum hoses for breaks or loose fittings.

Mar 12, 2009 | 1998 Jaguar XJ8L

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