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Ive got a 97 blazer. Just replaced all 4 o2 sensors, all 6…

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Hi Gary. Ive got a...
Hi Gary. Ive got a 97 blazer. Just replaced all 4 o2 sensors, all 6 plugs, and the fuel peessure regulator. MIL has been cleared but came back with the same codes. P1133, P1153, P0172, and P0175. Any help would be much appreciated.
Submitted: 10 months ago.Category: Chevy
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Answered in 40 minutes by:
9/29/2017
Chevy Mechanic: Jerry Newton, Chevy Technician replied 10 months ago
Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,694
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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It's running rich, and there aren't many reasons why it will run rich. A faulty MAF sensor can make it run rich, a leaking fuel pressure regulator (which I see you replaced), or a leaking fuel body (the part that the regulator attaches to), or fuel coming from the EVAP system (check the purge valve hose and see if there is wet fuel there, there shouldn't be).

If you solve the rich condition, you'll likely solve all of these codes at once.

Please take a moment to rate my answers, that's how I get compensated. If you have more questions, I am happy to follow up with you.

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Customer reply replied 10 months ago
Purge valve hose was dry. Gonna give the MAF a shot
Chevy Mechanic: Jerry Newton, Chevy Technician replied 10 months ago

OK!

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Customer reply replied 10 months ago
Ive driven about 20 miles or so with the new MAF and the MIL is still off but when I scan the truck Im still picking up the P1133 and P1153 codes. Something about insufficient switching for the o2 sensors.. Is it just because the vehicle has yet to run its own self test on the system?
Chevy Mechanic: Jerry Newton, Chevy Technician replied 10 months ago

The oxygen sensors may or may not have been related to the other issues, but it was important to solve those other issues before addressing these codes.

What brand of oxygen sensor did you install?

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Customer reply replied 10 months ago
I believe I used Denso o2 sensors. I was told all 4 were the same part.
Chevy Mechanic: Jerry Newton, Chevy Technician replied 10 months ago

I would replace those with AC Delco sensors. These two codes refer to sensor sensitivity, the codes tell us that the sensor circuits are connected and fine, but that the sensors just aren't active enough. I always use AC Delco sensors in GM cars and trucks, I think if you replace them with OEM parts, this problem will go away for you.

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