After buying a nice low mileage 2006 XJR from TX in January and driving back home to the Ohio winter, the check engine light has recently come on and stays on. So, I bought a OBDII scanner to check things out.

My first scan revealed a bunch of codes:
P0151
P0351
P0556
P0731
P0936
P0b31
I cleared the codes and started the car and went for a 20min drive. When I arrived back home I turned the car off and on, the check engine light came back on.

These are the codes from the second scan I performed:
P0056
P0236
P0451
P0631
P0851
P0a31
P0056

Any idea what could be causing all these codes? I just had the battery changed a few weeks ago, as the old battery was dead. The car is driving fine no issue with it, just the check engine light is coming on.

 

I don't have any experience with trouble codes so far (knock on wood) but are you using a OBDII scanner that is capable of reading Jaguar Powertrain specific codes? If not they throw bad readings. You can search this forum on devices that will work. See This Link https://www.jaguarforums.com/forum/g...-%2A%2A-33347/

I say this because the codes you list are not in the powertrain manual of Jaguar.

Please see the "X350 / X358 'HOW TO' quick links" and go down to the X350 Workshop Manual in six sections and open Powertrain. Scroll way down and you will see a section on P codes.


GENERIC & ENHANCED OBD II CODES
Something else thatcomplicates diagnosis is that "standardized" OBD II codes really aren't.
There are actuallytwo different types. "Generic" OBD II codes are the same in the sensethat all vehicle manufacturers use the same code number to indicate the sametype of problem. But each vehicle manufacturers also has their own special "enhanced"codes that cover problems not included in the basic OBD2 code list.

These include manyproblems not covered by the generic codes as well as problems that are outsidethe engine management system such as ABS codes, climate control codes, bodycodes, air bag codes, etc.

Generic OBD II codesall start with "P0" while the OEM enhanced codes all start with a"P1." Enhanced codes are often vehicle specific, and may not bereadable with some code readers or scan tools. In other words, it may require certainscanners, special software or a dealerscan tool such as SDD to read the enhanced codes.

 

It's just a cheap reader I picked up at Wallmart. So, the description on the package of the OBD2 reader isn't correct, when they state "For use with All 1996 and newer OBDII compliant vehicles." Looks like I'll have to find one that works on a 2006 XJR.

 

YES, the description on the package of the OBD2 reader isn't correct, when they state "For use with All 1996 and newer OBDII compliant vehicles."

Go to a Auto parts store such as Autozone or Advanced Auto Parts and they will read your codes for free and give you a print out, they may be using a scanner that is capable of reading Jaguar P codes. You will know if the codes match up to the powertrain fault code manual.

The X350 Workshop Manual gives definitions for the DTCs.
The C codes are mostly in the Chassis section,
the P codes in the Powertrain section,
the B codes in the Body section and
the U ("Undefined," or mostly network-related)are mostly in the Electrical section.

 

This listing may help.

 

Doesn't the standard OBD2 reader only read the P codes. All the other codes have to be read using more specific device like SDD/IDS and some of the expensive high level readers?

 

Check your throttle body. It may need a cleaning. Its is known to throw lots of codes similar to yours.

 

My car was throwing a ton of codes, and a previous shop had thrown a lot of parts at the problems. In short - they failed to trace the issue back to the root cause.

My current mechanic dug in carefully searching for a logical explanation, and found a severely corroded connector under the passenger seat in the back. The root cause of the corrosion was a kinked rubber hose in the sunroof drain which allowed water to infiltrate the connector on a frequent basis. Drain hose was fixed, and then hard solder the wires, eliminating the connector. Codes disappeared.

So the net of sharing that story is to suggest that you may want to carefully look at many of the connections in the car. Lots of codes could indicate a similar electrical issue related to corrosion rather than a bunch of failed parts. Maybe a slim chance, but looking at the connectors shouldn't hurt. The mechanic had a big advantage though compared to me as a shadetree mechanic: a) they know Jags and jag systems; and b) they were able to use references to determine which electrical pathways were common to the fault codes, so only had to check a smaller number of connectors, rather than all of the connectors on the car.

Good luck!

 

Not sure if I can help - but where are you in Ohio?

 

Before you do anything else, I would recommend you replace your battery. These cars are sensitive to weak voltages, and will throw random DTCs.

Unless you know the battery is recent, tested, and fully charged. A new battery has quite often solved issues of multiple or confusing codes.

 

+1 on get the battery checked. That comes up time and time again. What would be slightly 'tired' but perfectly serviceable in any other car will cause loads of trouble in a 350.

 

He says it had a new battery, I think.

Might have a drain so need recharging. Well worth trying. Also load test as new ones can fail, though rarely.

The codes suggest the OBD tool is working. (If an elm327 works on these cars then very cheap to get one and check the codes, though.)

If they're not "false" codes then there's likely some one or few causes that cascade and result in so many codes. Loom, power, ground, etc fault. They can be a pain to figure & find.

 

Does your 2006 XJR fall within the following the VIN numbers?

G49701-H01992

This TSB might be worth considering:

Here is a link to the full TSB:

http://www.jagrepair.com/images/TSB/...alibration.pdf