2005 XJ8 fault codes - help needed

[bobsavage789]

Hi all,

I recently had the engine light come on on my 2005 4.2 Sovereign. I took it to my trusted mechanic, who read the following sets of codes:

First reading:

P0305 – Cylinder 5 misfire detected
P1313 – Misfire rate catalyst damage bank 1
P1316 – Misfire rate excess emissions
P1260 – Security input

Codes cleared, then second reading:

B2879 – Fuel tank jet pump fault

Codes cleared again, then third reading:

P0191 – Fuel rail pressure sensor circuit range/performance

Is anyone able to shed any light on the cause of the EML? It’s running very lumpy, mainly when Drive is engaged, with no brake or accelerator pressing. I also get “restricted performance” when I try to accelerate with any sort of urgency.

Thanks in advance!

[reddiesel]

Personally my first port of call would be a new fuel filter because that alone will give all the symptoms you mention .

[bobsavage789]

All sorted: turned out to be a coil pack.

[anonymous-user]

Thanks for reporting back. Makes sense with the misfire codes, it's odd how a fault can turn up bullst error messages.

In my experience if one has gone others won't be far behind, it's probably worth having one or two in the car with a small toolset because they're a 2 minute job to change.