Hi


Am new to the world of Jag ownership and have recently bought a 2008 XKR. Not long after buying it the engine management light came on and restricted performance. I took it to a local garage to read the errors and the cat came up as well as the water pump for the supercharger. We replaced the water pump and the car hasn't suffered any loss of performance. Then after 500 miles the engine management light came on again. They are now sure its the cat or the air sensor on the cat.


We are doing some tests on it and have reset it again to see if it comes up.


Just wondering if this is a common problem with the XKR. Ive read a few posts but cant seem to find if its common or not. Also what ball park figure a cat would be? Cars done 100k miles.


Thanks

 

I think your search answered your question. It's not common, but @ 100k miles, not unreasonable to expect. Jaguar Cats are as reliable as any car. As for price, do a simple google search if you're looking for stock. Dealer Price around $1K, aftermarket $250 but that's here in the U.S.

 

I'd also look into replacing the o2's before the cats as they are prone to reading wrong as they age and will give false readings. I wouldn't replace the cats unless the media is damaged / blocked / gone. A cheap bore scope will show that.

 

On my 2007 the cat had failed around 30,000 miles. There is a foam that surrounds the brick to seal it and it had come loose on the first brick in the converter partially blocking one of the cats. So whenever you pushed on the fun pedal it would go into restricted performance as it could not deal with the increased volume of air.

My cost to fix was under $20.00 as I gutted the cats welded in a 2" perforated tube and packed it with ceramic glass. Then welded it all back up. See my post "convertor delete, why not?" Now she flows well. Basically converted my convertors into mini glass pacs. The rest of the exhaust is stock.

I do have the engine light on as the codes it is throwing off the o2 sensors needs to be tuned out. The exhaust note at idle or under normal driving is hardly even noticeable from stock. The exhaust note when you get on it is now intoxicating, can't keep my foot out of the throttle. Everybody in close proximity now knows when I'm getting on it. I have had nothing but compliments on how it sounds under acceleration.

 

Before you replace your cat with any after market (much cheaper) cat check with MOT to determine whether or not an after market cat is acceptable. In California, USA one must replace an oem cat with another oem cat - after market cats are not accepted.

 

Do they crawl under your car and check? If there's no visible markings, how are they going to know?

 

The OP is in London. Local laws apply.

 

Bet they run the exhaust through a sensor and read what is coming out of the tail pipes.

 

The quality of eom cats is by far way better than aftermarket. When you go to scrap used cats aftermarket will get you no more than $5 if at all. Oem will go for $40-60 depending on size. They have alot more precious metal and work better for alot longer. Usa oem emmission warranty is a mandatory 8yrs 80k.
And 1 of 19 go to www.bigaddiesgarage.com and get the downstream 02 extenders to move the sensors out of the exhaust stream and that should be enough to get your p0430,p0420 codes to stay off, they work well...

 

Thanks for all the responses. We have switched the o2 sensors over as to see if we still get the same errors. At the minute its erroring on the left side cat.


So hopefully its just the o2 sensor.

 

In Kalifornia they do as part of the bi-annual smog check. Here is an excerpt from the 2009 law:

CARB [Califronia Air Resources Board] converter labeling
According to CARB requirements, every new CARB-compliant replacement converter must display a certification stamp or label on the converter shell that includes the CARB Executive Order approval number, the part number, date of manufacturer, and proper installation direction. This is the only way you can be sure that you are installing the CARB-compliant converter on a vehicle that requires it.

If it was replaced before 2009 without a Kalifornia compliant catalytic converter you better have a receipt or you will fail the smog inspection.

 

Bet some enterprising individual is selling those stickers (clones of an original), somewhere.

 

California does two tests: 1. a "sniff test", which is measurement of exhaust emissions using a probe in the exhaust pipe; and 2. a "visual", which looks the motor over visually to see if headers have been installed and/or there are missing emission-related tubing/wires and finally under the car with a mirror to confirm that an oem cat is in place.

 

Curious: did this fix the issue?

 

I recently bought a 2007 xkr with 58000 miles. When ever I went wot the reduced performance light up with cylinder misfires and the cat efficiency code. So what did I do? Spent 1000 on plugs, coil packs, and 02s. Made no difference. Bought two MagnaFlow non-50 state cats (hotexhaust.com) and now it runs like mad and sounds awesome. My car is missing the active exhaust fuse tho.
So the moral of the story? If the codes say cat efficiency reduced believe it!

 

As these cars are coming up on 10 years old we will see more and more failed catalysts.

I'm two for two on my own cars, the XJR and XKR, both had failed cats, and I can cite at least a dozen other cases here on the forum and people I know who also had failed cats.

If you have misfires at WOT with no codes, I'd say cats before coils.

 

The OP was last on 7/2/2017. He has 2 posts, both in this thread. Sadly, it's not uncommon for someone to join the forum, ask a question, than never return.