O2 Sensor code - P0053 Heater resistance Bank 1 Sensor 1

[Enjoyneering]

Now I have another problem - on the highway LTFT sits around 7..8% +- 2..3% STFT.

I get nice 0% long term fuel trim +-5% short term fuel trim, during the warm up and idle. As a prove see the picture below. On the screenshot the engine still warming up (temperature is 44C and did't reach 75C, RPM is still too high 879, should be around 750). MAP is in the range - 35kPa, and MAF is ok too - 3.6 g/sec. It means MAF and MAP work fine.



Since I figured out my MAF and MAP is OK it could be another vacuum leak or fuel pump is dying. But I my LTFT is perfect during the idle - it means no leaks. I removed the pump and found that my pre-pump filter is clogged and dirty and fuel filter is still OK.





For some reason GM and aftermarket don't sell pre-pump & fuel filter separately. You have to buy whole assembly for 250-320 CAD. Dose anybody know where I can buy pre-pump filter? Thank you in advance.