O2 Sensor code - P0053 Heater resistance Bank 1 Sensor 1

[Enjoyneering]

Good day everyone.

A week ago I changed the injectors gaskets and error code P0133 gone.



However P0053 was still present. So I went to the store and explained the issue: the new sensor has resistance of 5 Ohm, the old from the car has 10..11 Ohm. They agree to exchange. Next day I got a "new" o2. The sensor has some dents and scratches on the nut and missed anti seize grease but the protective cap was shiny (maybe they put it on the car for test before???). After I put it on the car the P0053 gone right away. Had pending P0171 for a day and next day it gone too.

[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.

[WyrTwister]

Check rockauto.com , if they sell to Canada ?

Or eBay ?

God bless
Wyr

[Enjoyneering]

I've checked rockauto and ebay - only
fuel pump assembly for ~200 cad.

[WyrTwister]

How much is it at your local parts srores ?

God bless
Wyr

[Enjoyneering]

Local price is ~200 cad for the pump assembly. A year ago I got Kia Rio5 pre-pump filter for 15CAD and fuel filter for 35CAD. Feel the difference.

[WyrTwister]

As a last resort , check GM ?

Please refresh my memory . How many miles on the car ?

God bless
Wyr

PS Try contacting the filter manufacturers ? Google them and see if they have toll free numbers or email addresses for customer service .

[Enjoyneering]

70 000 miles.

Do you know the filter manufacture?

[WyrTwister]

Sorry , no .

The car is made in Korea but had no look googling Korean fuel pre filter .

Try the American brands like Fram , Purilator , Wix , etc. .

God bless
Wyr

[Enjoyneering]

Thank you, but I still can't understand why GM doesn't sell pre-pump and fuel filter. Almost all makers sell it separately and suggest to replace fuel filter every 60000km...90000km.