I keep getting restricted performance on my 2007 STR. Scanned it and what came up was Catalyst System Efficiency Below Threshold Bank 2. Would replacing the catalytic converter on bank 2 help solve the problem??? I would greatly appreciated everyones opinion. Also what would cause the converter to fail?

 

Before you replace anything try cataclean. It is usually in the same area as gas treatments. I had the same intermitant problem when i first bought my car. Put in 2 bottles of cataclean and one octane boost in the tank about 1/4 tank and ran until low fuel and it never came back. Worked for me so might be worth a try. You could also have an o2 sensor problem or some other things going on but the treatment is way easier and cheaper. It cannot hurt anything by the way

 

Does it come up only on hard acceleration? If so my 2007 XKR had an issue with the convertor on the passenger side. Part of the foam that wraps around the convertor brick inside had come loose and was blocking air flow. No problem driving around town but on the freeway entrance ramp it would fall into restricted performance as I stepped into the fun pedal. Not a normal failure for sure but it happened to me. Restart the car and everything went back to normal until the next freeway ramp.

 

Do you have the error/fault code?

If so you can look it up in the Jaguar workshop manual that will give you a series of pin pint tests to find the fault:

http://www.jagrepair.com/images/Auto...M-Workshop.pdf

Mellow

 

Do you have the 5 digit code? It's one letter followed by four numbers, such as P0430. Some code readers or scanners do not always give accurate descriptions, so it's best to go by the actual code.

For the description you gave, I think that's code P0430. You can see more details here:

http://www.jagrepair.com/images/Auto..._OBD_II_R2.pdf


I'm confused because I do not think P0430 by itself will cause the car to enter Restricted Performance mode. Per the chart linked above, look at the Other column. You've got an N, meaning you'd get no other warnings. Same with the Default Action column, meaning you won't get Restricted Performance.

Compare that with P1314, a misfire at a rate strong enough to cause catalyst damage. In the Other column, you've got an A for amber message. The chart only specifies that color, not the actual message, but I think it's "Restricted Performance" with that example. In the Default Action column, it shows engine speed is limited.

So before we dig too deeply, please post the 5 digit code and if there are any other messages.

 

These are the two codes I'm getting P0430 and P2601
I had some misfires in the cylinders and engine but new spark plugs solved those problems

 

I've tried the cat clean and still the same problem

 

Phew! Glad I asked. You've got two unrelated faults active at the same time. P0430 is for catalyst efficiency, and is pretty low level. It means that cat is getting tired and not cleaning up the exhaust as well as it should. There are some things you can try, but I'd suggest putting this on the back burner for the moment. This code is not causing the restricted performance.

P2601 is much higher priority. It is for the supercharger intercooler pump. Search the entire forum for this code, as some other supercharged models use a similar system. I'm not sure exactly what trips this code, but it will restrict performance to protect the engine.

The intercooler pump is electrically driven, but is not to be confused with the auxiliary coolant pump found on V8 models. This other aux pump is for improved coolant circulation under certain conditions, such as running the heater at idle.

Details of the intercooler pump can be found here:

http://www.jagrepair.com/images/Auto...cal-2006on.pdf


See figure 03.6 for the pump itself, and figure 01.7 for the control circuit. First thing, check fuse F36 in the front power distribution box under the hood. If good, try swapping control relay R9 with a known good relay of the same size. Check that your fog lamps work, and then relay F11 becomes a good donor. Go for a test drive and see if the code clears.

If the fault remains and the fuse is still good, remove relay R9 again. Engine off. Connect a jumper between sockets 3 and 5. (A paper clip will work) This will send battery power to fuse F36 and the pump. If the pump is good, you should be able to hear it run.

 

ahhh. Ok then. Hard parts will probably be needed. The mis fire you corrected could have dumped fuel and ruined the cat

 

I know that when my intercooler pump wasn’t running I would get the restricted performance warning after I floored it on the freeway. Replaced it with the Bosch upgrade pump and no problem cents

 

Yes if you need a pump consider upgrading to the Bosch pump Aarcuda did. Pretty cheap to do.
That should fix your restricted performance problem.
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I'm in Canada and its hard to find parts here for the s-type. Where can I find the pump?

 

Sorry, can't help with a source. Hopefully somebody else will chime in.

In the meantime, have you tested the pump and control circuit as suggested in post #8? I'm guessing the pump isn't cheap, and I'd want to know for sure it was bad before opening my wallet.

 

If your interested many of us have used the Bosch 010 pump instead. There are others too.
It does take a small amount of modification to fit but it's pretty simple. Plus the pump is fairly cheap and easy to find. A little over $100.
Just look up Bosch 010 pump.
It's even on Amazon and EBay all over.

I got mine for few bucks cheaper on EBay.
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Exactly. Ease of replacement in order. On a car lift. Or remove front bumper cover. Or on your back with car on stands. I did the bumper cover and it very accessible

 

Will do that thank you so much

 

This is not an S Type but still a very useful thread from Bigg Will.
Take a look;
Upgraded IC Pump Install

I used the MB plug when I did this on my 2014 XJR. Very easy with the front bumper cover off. Not so much with it on!
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Where can I find the pump?? I live in Canada