Question about Jaguar S-Type
Engine light and restricted performance light keeps coming on. what does this mean
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
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
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
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
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
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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