well i went to auto zone to check the check engine light on my 2004 xjr they gave me these codes #P0171 definition: fuel injection system too lean-bank 1 (cylinder number 1 denotes bank 1) probable cause low fuel pressure or ignition system fault large vacuum leak faulty MAF sensor and the second thing is P1111 control solenoid valve circuit fault-bank 1 probable cause 1open or short circuit condition 2 poor electrical connection 3 block passage 4 failed IVT solenoid thanks to who ever helps

 

Feli - I've moved your post from the general tech section to the XJ (X350/X358) section where members with similar models can best assist you

regards,
steve

 

Hi Felipe,

Welcome to the forum!

For the most helpful information, it would be best to have the diagnostic fault codes (DTCs) read by a mechanic with a system capable of reading the Jaguar proprietary codes. On an X350, the P1111 code just indicates that the system has successfully completed its selftests and it's a code you want to see, so don't worry about that one.

The P0171 can have a number of possible causes, one of which is a clogged fuel filter, but perhaps the most common cause is an air leak in the intake air plumbing between the Mass Air Flow Sensor (MAFS) and the cylinder head. I am attaching a pdf that contains summaries of the 2004 X350 Powertrain (P) DTCs. Check all the various possible causes of P0171.

You can find the definitions for the Chassis (C), Body (B) and Undefined (U) DTCs in the X350 Workshop Manual, which can be downloaded in six sections from the X350 'HOW TO' quick links thread on the home page of this X350 forum.

I hope this information is helpful. Please keep us informed.

Cheers,

Don

I hope this inform

 

thanks Don i'm just hoping it isn't anything worst then the things you mention but thanks again