after repairs I'm getting a new code PO172

Asked by Valerie Aug 24, 2020 at 07:27 AM about the 2004 Chevrolet Trailblazer LS 4WD

Question type: Maintenance & Repair

I have replaced the air injection valve,both oxygen sensors,spark plugs,cleaned the throttle body and replaced the gasket,replaced the small vacuum hose to the air box. now it is giving me a code of PO172 the engine is racing at a high throttle then goes back to normal then high throttle again any help would be appreciated

1 Answer

11,605

P0172 popped up AFTER you changed those things? A few things to know here. Our 4.2 engine loves AC Delco spark plugs, 41-103. Also, some brands of oxygen sensors can be touchy, and not be within the parameters of GM if it's not AC Delco or Delphi. Bosch 02 sensors are the worst. Since, 04 doesn't have a MAF, try cleaning your MAP sensor. Make sure all of your connections from the airbox and throttle body are good air tight. Further than this, you may have to do a fuel pressure test at the rail. If this code popped up only after your recent work, it's something you did, and easily fixable. Triple check all your work.

1 people found this helpful.

Your Answer:

CarGurus Experts

  • #1
    FJ4072
    Reputation
    7,710
  • #2
    Gene Arnett
    Reputation
    3,180
  • #3
    bigdogracer
    Reputation
    2,760
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Blazer
19 Great Deals out of 899 listings starting at $2,888
Used Chevrolet Equinox
67 Great Deals out of 2,940 listings starting at $2,900
Used Chevrolet Silverado 1500
177 Great Deals out of 5,872 listings starting at $2,975
Used Chevrolet Tahoe
12 Great Deals out of 889 listings starting at $12,900
Used Jeep Grand Cherokee
115 Great Deals out of 3,183 listings starting at $3,995
Used Toyota RAV4
103 Great Deals out of 2,588 listings starting at $3,495
Used Toyota 4Runner
19 Great Deals out of 295 listings starting at $9,995
Used Ford Explorer
79 Great Deals out of 2,097 listings starting at $3,995
Used Chevrolet Colorado
29 Great Deals out of 1,525 listings starting at $5,800
Used Ford F-150
305 Great Deals out of 14,144 listings starting at $1,712
Used Honda CR-V
89 Great Deals out of 4,428 listings starting at $1,695
Used Dodge Durango
50 Great Deals out of 2,250 listings starting at $5,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.