Hello, I just replace the o2 sensor and Fault code P1647 is fixed! But now I still have Check Engine light on and 2 new fault codes appear.

Fault Code: P0171 and P0174

Please advise what is this new codes mean and how to fix...
Thanks,
Chrys

 

We replaced PCV Hose , EGR Valve and these idiot two codes were gone .You can also do a search regarding these codes

 

i think those codes are generated from a vacuum leak...have you inspected all the hoses which carry vacuum pressure?
could also be upper or lower intake gasket failure?

 

I followed your recommendations and check for vacuum leaks. I found the O rings leaking and replace them.
(By the way the bottom one is hard remove the housing ...Someone recommend cutting the old ring and try to replace the new with out remove the housing. Don't do it! It will brake! What can you do is.. Use a screwdriver when sensor almost out and gentle force up and it will come out)
Thanks again!!

 

I've change: O Rings, upper & lower intake gaskets,plugs,MAF, and still error codes P0171-P0174
I like to upload photos of the details on these error codes if someone can tell me how to do it..I think it may help others with same problems.

 

https://www.jaguarforums.com/forum/j...pictures-2418/

https://www.jaguarforums.com/forum/j...essages-36173/

 

The P0171 & P0174 codes are often related to a vacuum leak and this information should help http://jagrepair.com/images/AutoRepairPhotos/P0171.pdf now remember that I said most of the time. In my quest to find my leaks I used throttle body cleaner but I understand the soapy water is as good. This forum has a lot of information relating to vacuum leaks but you will need to do a search. I have other information on vacuum leaks on my page if you wish to view it.

 

Thank you Norri, photos are attached.
Thank you Gus as well for your information.. Maybe now you can read these test results and point where the error codes are ...
Thank you again guys!!