I have tried everything to get my 2007 Jaguar to pass the emissions test here in Texas. I have replaced oxygen sensor with OEM parts and it still shows up as a fault and I cannot get it down to one fault. Any thoughts or advice?

 

I'm guessing you still have the original cat converters on your 07 ??

 

I had the insulation that holds the honeycomb stone in place come loose and fall in front of the stone blocking the air on my 07 catalytic.

 

Had the issue on another car (not Jaguar).
I did fit a spacer on the post-cat O2 sensor, it solved the issue in my case.

 

Have you try hydrogen descaling? very efficient for this purpose and it's healthy for the whole engine system.

 

Bobby, is your car an XK or XKR?

Have you done any air intake modifications like a K&N filter?

How many miles?

Do you have a scanner that can read specifically fuel trim live data?

Have you had the intake manifold removed for any reason (coolant repair) or the intake gaskets replaced? If so, how long ago?

 

err, am I missing something? Why the assumption that the O2 sensors are the issue.
In this case, just replace the cats.

 

Some thoughts for action in order of priority.:
Do an injector cleaning treatment.
Add the O2 sensor extensions
Are you running the OE plugs? I think they are platinum tipped.

 

The only useful evidence thus far is the new (oem) O2 sensors. It would be helpful to know which codes are you throwing which causes the failure. Additionally, what is the statement in the failure report?
Without evidence, you will continue to play the musical parts game. You might get lucky and hit a hole in one. But it is an expensive path for 'lucky'.

And apologies, I had a different thread in mind when I suggested the new cats. I would want to see evidence for the need for replacement.
But your car is an '07... and if you have as many miles as me... well, I'm on my 3rd set of cats.

 

Post 2 same train of thought as you

 

Your kidding right. Like saying my engine not running right so just replace the engine.

 

Seems you missed my follow-on post.
Cheers.

 

Sorry I guess I did , I was really replying to steve k's which he seemed to agree with replacing cats. But the thread got a little mixed up I guess.

 

From other posts in 2022, a few guys had success getting rid of O2 codes by using a Catalytic Converter Cleaner.

 

Can't pass the emissions test and I'm looking at the converters. I don't see the logic in your statement; it's nothing like replacing an entire engine are you kidding

 

Maybe not but I am not in the habit of throwing 1000 bills around if not necessary. What is a new OEM cat...2000 bucks ? Even after market its big dough.

 

He posted once. Let's see if he comes back and defines "everything" he tried and includes codes. Without codes, this thread won't be helpful as you know.

 

In terms of throwing around $1000 bills, the OP has already done that, saying he has replaced O2 sensors with OEM parts to no avail, and I cannot imagine this being a cheap process. As a 2007, the convertors are on the better side of 16yrs of age. The whole purpose of catalytic convertors is to reduce harmful emissions. I do not know why you are getting so worked up about this.

 

My previous Jaguar (1993 XJS 4.0) couldn't pass its California tailpipe emissions test.
I had a muffler shop cut out the old catalytic converts and weld in new, generic ones for a couple hundred USD each.
The car then passed with flying colors.
Carparts.com and others sell just the converter without the exhaust pipe. Unless your pipes are rusted out most muffler shops could make the change for you for the cost of labor.

 

Not getting worked up about it. Lets do the fix from your angle lets spend 4 grand on converters and see if that works. Oh oh it doesn't.....