Will do. Thanks again to all for the help.

 

Any updates? The suspense is killing me...

 

I put the older o2s back in. No pending or hot codes. But the o2 is still not ready after doing multiple drive cycles. Kinda out of ideas except for driving it a little everyday for a week and see what happens.

 

Seems you’re making a little progress, with the old sensors cleaning up the codes.

Did you try the full Jaguar drive cycle in that PDF? Definitely some odd stuff, with a certain RPM in 3rd gear, coasting, etc.

After that, does your local test authority have a referee program? Most do, for dealing with vehicles that won’t pass despite repair efforts. Some handle it internally, others via a 3rd party.

 

Well I must have jinx it because right after posting my update an hour or so ago. I got a lean bank 2 code. I know it's a long shot but I feel like something is wrong with the ECU or something. I have had the car since 2017 and have fought lean bank 2 codes since the start. I have replaced the fuel filter, smoke tested for leaks, swapped o2 sensors, multiple cans of 44k, rebuilt injectors. I'm kinda out of ideas at this moment.
As for the drive cycles. Yes I followed the PDFs and done multiple cycles. Still not ready.

I live in California so typically strict smog rules. But I may have to look into a workaround because this is insane at this point.

 

It's REALLY not at all likely to be the PCM.

If you've a code or cause for one then the monitors are quite likely never to set.

It's fixable, almost certainly. But... some states have a waiver where more than a threshold has been spent trying to fix an awkward car, maybe yours?

 

Well, any ideas what may be causing these?

 

The car's giving the data. You may need a tech who understands OBD (heck it's about 25 years old!) who can fix the car.

 

Yeah I guess so. I took it to a well known Jag shop a year ago and had them do a detailed test on everything. They seemed a little stunned and said they believed it was injectors. After getting a big quote from them, I decided to do the injectors myself. I had them rebuilt and tested. The injector guy said they weren't really bad injectors pre rebuild. But after all the re-assembly, I drove the car 600-700 miles with no o2 sensor readiness and now we are here. So definitely a little lost.

 

Check the exhaust pipe to exhaust manifold connection. Many pipes have a smart raised welded seam on them that makes the metal to metal seal leak.

you have a leak. Just gotta find it. I just found this cracked fitting on my valve cover last weekend. Its for the pcv air intake from the air filter inlet tube

 

Always bear in mind that if the fuel trims are different side-to-side then it's very hard for the cause to be a common item (MAF, ECT, IAT, etc).

And conversely if the trims are very similar but out then it probably is a common item.

 

Great find on that crack! So small I don't think I would have found it.

On my 2005 STR I had a P/B vacuum fitting that was partially failed. Are you aware of this goofy and failure prone connection?
It rotates and has an o-ring that gets hard as a rock with time and temperature. It's located in the SC elbow so affects both banks.
I doubt you would ever see it with a smoke test. If it gets bad enough it will set both lean codes P0174 and P0171.

Here is my long thread on the repair and how I found it;
STR Vacuum Leak
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.
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So I gets to thinking...

Could these cats be part of the equation, even though they are certified for your car? With any performance parts, I'd imagine the designers would tweak them to get as much power as possible, unfortunately also pushing the emissions parameters close to the edge. Pure conjecture on my part, but maybe on stock parts, there's a lot of margin to meet emissions standards. Performance parts? Maybe not so much.

Do you have O2 sensor extenders, those spacers that move the sensing element away from the exhaust stream? Not 100% sure if this applies to our cars, but I thought the PCM deliberately misfuels the engine briefly under certain conditions (steady cruise?) to look for the correct response from the O2 sensors. If so, I do not know if the lack of response would be enough to set a code, or just not satisfy the monitor.

Sorry I don't have any answers for you, just things to consider.

 

I considered the aftermarket cats being a subject. But idk enough about the ecu to know if aftermarket cats would do that or not. As for spacers, I do not have spacers on the car.

 

All I know is (or think I know) that unless you clear the DTCs sometimes the tests wont run. Then you need to hit the right conditions. On Jagrepair theres the drive cycle instructions and some are quite complex or difficult to achieve with regular driving. Have you read those?

I got most of mine to run except for the difficult ones.

 

Yes. I have done hundreds of miles and repeats of the detailed drive cycles and no luck. There’s obviously something wrong. But after doing another smoke test in the intake and exhaust, swapping o2 sensors, rebuilding injectors. I’m really out of ideas at this rate and trying more basic things like a maf sensor. I might have to take it back to a jag professional.

 

I managed to get this far

 

Change "clear the DTCs" to "fix such that the DTCs are gone".

I'd next try to fix the EVAP-related problem. Not so easy to smoke test.

I hope you made sure the tests all ran OK after you changed the cats, otherwise you could be chasing tests that never will be OK.

 

CORRECT!! From the Jag training manuals it says (FIND AND READ 810-JAG: Engine Management and Diagnostics):
If a malfunction is detected that could cause vehicle
emissions to exceed 1.5 times the allowable limit during
a drive cycle, a DTC will be set. If the same malfunction
is detected on 2 consecutive drive cycles, the ECM will
illuminate the Malfunction Indicator Light (MIL) to alert
the driver that a malfunction has occurred.
Diagnostic Monitor Drive Cycles are defined as ‘Short
Cycle’, which test continuously monitored systems, and
‘Long Cycle’, which will test non-continuously monitored
systems.
Drive cycle test results are located within IDS/SDD >
Diagnostics > Recommendations > OBDII Readiness
tests.
NOTE: Diagnostic Monitor Drive Cycles must be completed
before a DTC can be set. If the DTCs are cleared
from system memory, the cycle must be re-run in order to
re-set a DTC. When investigating an MIL or DTC, do not
begin diagnostics by clearing DTCs.

 

Hey there. Was wondering if you ever got your O2 monitor to complete. Thanks.