hello i have jaguar x type 2.1 2004 model ! currently i have a limp mode and i connected it to obd2 ..this triggered a code of rich condition in both banks ! bank 2 little bit raised, both banks have long term fuel trim -20,3 and short term fuel trim around -10/-15 ... the car have an lpg system on it ! currently i have changed previous week 2 o2 sensors but the problem still persists but it fixed lean condition ! the car before o2 change went lean and rich in non specific times ! ... the car also make a fast glu glu glu sound ...also sometimes when i go to start it it have no power and when i press gas stalls immediatly ! but in non specific times ! sorry for my english i try my best !
i upload some pictures of my elm327 obd

 

there is only one code I found, which can be a reason, it is EGR. P0402(?). Plug it.
check air filter
Check MAF sensor (live data) to make sure it shows air volume increase when you slowly depress pedal.
Check short trim difference between idle speed and 3000 rpm.

 

hello i think my petrol model doesnt have an egr ... there is no code p0402 in my car ...
i replaced air filter ! maf sensor live data changes when i depress pedal !
in idle it has around -10 at 1500rpm it goes around -4, -15 at 3000rpm it makes around -4 , -15 again ! both banks !

 

May well be damaged cat(s) - an inspection & cat tests will show you.

 

you posted so many pictures, you don't even remember! there is 402 code!
You also had 2 MAF codes: air flow and air temp (it is inside MAF) If you replaced MAF, it doesn't mean it is a good one! I bought 3 MAF sensors for some Nissan (Chinese new from ebay, used from ebay, new from Autozone) and only one of them was good, it was $20 new Chinese MAF.! I talked to friend of mine, repair shop owner, very smart guy, he said it was very common to buy bad one.

 

oh yeah i had also the p0402 code you told me you are right ...i will give a new one maf a try !!

 

clean MAF with break cleaner before replacing it. And you still have to deal with EGR