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

83,465

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.

44,015

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

Search Chevrolet Blazer Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Chevrolet Blazer Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 1,840
#2 yetilikesbeer
yetilikesbeer
Reputation 1,120
#3 Rowefast
Rowefast
Reputation 690
View All

Related Models For Sale

Used Chevrolet Tahoe
815 Great Deals out of 27,814 listings starting at $1,700
Used Chevrolet S-10
13 Great Deals out of 1,624 listings starting at $1,399
Used Chevrolet Silverado 1500
2,513 Great Deals out of 152,115 listings starting at $1,500
Used GMC Jimmy
284 listings starting at $2,800
Used Ford Explorer
1,066 Great Deals out of 71,554 listings starting at $1,000
Used Chevrolet Camaro
400 Great Deals out of 40,630 listings starting at $3,500
Used Jeep Grand Cherokee
904 Great Deals out of 66,337 listings starting at $1,500
Used Ford F-150
3,013 Great Deals out of 207,755 listings starting at $1,000
Used Jeep Cherokee
298 Great Deals out of 54,088 listings starting at $2,599
Used GMC Yukon
554 Great Deals out of 17,134 listings starting at $1,875
Used Chevrolet C/K 1500
1,065 listings starting at $1,250
Used Chevrolet Suburban
539 Great Deals out of 19,100 listings starting at $1,964
Used Chevrolet Impala
901 Great Deals out of 35,272 listings starting at $1,700

Used Cars For Sale