Running lean

Asked by Mar 18, 2016 at 04:17 AM about the 2000 Chevrolet Blazer 4 Door LT 4WD

Question type: Maintenance & Repair

Okay so I drive a 2000 chevy blazer. I just replaced
my o2 sensors because I went to auto zone
because my check engine light was on & it said
replace o2 sensor in bank one and two so we did.
Now the check engine light is back on saying my
engine is running to lean. Code P0171 but my
engine seems like it's running better. I'm so lost
can anyone give me any ideas?

2 Answers

95,035

Have you changed the fuel filter? When was the last fuel injector service? If light still comes on after that is done, run a fuel pressure test, pressure might be low.

71,355

You may have a intake or vacuum leak somewhere. Make sure the intake is snugged up and check the throttle body base gasket, & all vacuum lines. This is more info on the code....P0171 CHEVROLET - Fuel Trim System Lean Bank 1... Possible causes... - Intake air leaks - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connection... Some Tech notes... If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced. The P0171 code could also be caused may be caused by one or more of the following: debris on MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure or Engine Control Temperature (ECT) Sensor reading inaccurate.... There is a service bulletin on this you may want to look up...http://goo.gl/ZOB29 - or - 2000-2008 Chevrolet Factory Service Bulletin OBDII Code P0171

Your Answer

Add photo

Related Questions

  • Running lean 2 answers

    Okay so I drive a 2000 chevy blazer. I just replaced my o2 sensors because I went to auto zone because my check engine light was on & it said replace o2 sensor in bank one and two so we did. Now t...

    2000 Chevrolet Blazer 4 Door LT 4WD

    -

    Maintenance & Repair

  • running lean 5 answers

    Lately my truck has been showing service engin soon light, I hokked up a code reader and it says it is running lean on bank 1, so, I did a real time data check while driving it and noticed the O2 sens...

    2001 Chevrolet Silverado 1500 LT Extended Cab SB 4WD

    -

    Maintenance & Repair

  • Running hot 1 answer

    Hi, my NAME is SidneyNewsome. I changed the water pump and the thermostat even though it doesn't run hot in Park for long periods maybe an hour or so . but while driving it . it's start to go up ...

    2005 Chevrolet Blazer 4 Door LS

    -

    Maintenance & Repair

  • driverside running light 2 answers

    in the day when the sun is out my drivers side running light does not come on,but at night it does why?

    2004 Chevrolet Blazer 2 Door LS 4WD

    -

    Maintenance & Repair

  • 2001 4.3 chevy blazer running rough 1 answer

    towing an empty trailer for a friend. ive towed the same trailer loaded down no problem. ok, on the highway allof a sudden i heard something crack and fall off the front of the car passenger side it...

    2001 Chevrolet Blazer 2 Door LS

    -

    Maintenance & Repair

Search Chevrolet Blazer Questions

Chevrolet Blazer Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 1,990
#2 yetilikesbeer
yetilikesbeer
Reputation 1,300
#3 Rowefast
Rowefast
Reputation 1,030
View All

Related Models For Sale

Used Chevrolet Tahoe
559 Great Deals out of 31,371 listings starting at $1,500
Used Chevrolet S-10
5 Great Deals out of 1,310 listings starting at $2,695
Used Chevrolet Silverado 1500
1,764 Great Deals out of 181,202 listings starting at $250
Used GMC Jimmy
274 listings starting at $2,495
Used Ford Explorer
928 Great Deals out of 70,253 listings starting at $997
Used Chevrolet Camaro
244 Great Deals out of 31,194 listings starting at $369
Used Ford F-150
2,058 Great Deals out of 207,340 listings starting at $1,499
Used Jeep Grand Cherokee
1,027 Great Deals out of 72,252 listings starting at $700
Used Chevrolet Suburban
300 Great Deals out of 19,514 listings starting at $1,800
Used Ford Mustang
543 Great Deals out of 45,845 listings starting at $1,999
Used GMC Yukon
382 Great Deals out of 19,299 listings starting at $2,000
Used Chevrolet Impala
590 Great Deals out of 34,064 listings starting at $899

Used Cars For Sale

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.