Car running Rich and fuel rail pressure showing 600-1400 PSI

[fmas061]

Just recently my mark x started hesitating while giving full throttle. it was running like a dream since i bought it. today a cel came on which was P0136 (o2 sensor) which i will get it checked and then changed if required. When i connected the OBD2 scanner i saw he fuel trims which were quite off and were running rich in negative 15-20 range (mostly the ltft's bank1). What puzzled me was when i checked its fuel rail pressure it was way too high ranging 600 to 1400 PSI. I tried to google a 4gr fuel rail pressure but couldnt come up with a solid response most said the normal range is 48 to 68psi. Can anyone help and share me their cars fuel rail pressure at normal driving? i have a markx with 4gr bone stock no alterations whatsoever.
TIA

[Hassan1991]

That is the fuel pressure of the direct injection fuel system. 4grfse.

[fmas061]

thankyou for the reply brother.

Btw i changed the o2 sensor and the CEL for it is gone plus its working as it should but the car hesitation is still there, when flooring it car hesitates, it drives ok if i drive with low throttle at low RPMs. there is no CEL now. The fuel trims for Bank 2 are ok but for bank 1 its still running rich, if i keep the rpm low and at a constant speed then the fuel trims get normal around 0to5+- but when stop and go or floor it the fuel trims mostly the bank 2 go a negative 22.
I swapped a maf sensor to see if it gets better but no luck. i opened the sparkplugs and they were a bit black so cleaned them and took a test drive but problem is still there. Also at cold start after the car is parked whole night and the next day i start it, it makes a strange vibration plus the hesitation but as soon as its warmes up the sound is gone and i can drive it around at low throttle.

Any idea of what can be wrong?

[Hassan1991]

Bought new O2 or used?
Anything done to exhaust lately?
@Xulfiqar @rajaatta

[rajaatta]

Seems like engine is burning engine oil in that bank

[fmas061]

bought a kabli o2 but its working as it should. the one before it was dead it wasnt giving any readings on the obd2 scanner.

nothing done to the exhaust. but im thinking the bank 1 cat might be clogged..

[fmas061]

no brother engine is in perfect health no oil burns or smoke from the exhaust. the oil dipstick always shows full not even an ounce gets burned mashaALLAH se. i also took out bank 1s sparkplugs and they were ok just were a bit black due to it running rich.

[fmas061]

bef

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this was the condition of the bank1 spark plugs before cleaning them

[fmas061]

this is after cleaning them

[Hassan1991]

Yes, you need to perform a test for that. You got the service manual of 4grfse?

[rajaatta]

Okay let's test it other way.
You need techstream for that specific testing and the test is called afs test in utility menu there you can simulate both rich and lean mixtures and observing the readings of both banks afr sensors if the result is same then all is ok if the result varies then there is some thing wrong with the specific cylinder