my 2006 sienna running lean both banks

Asked by Apr 07, 2016 at 11:13 PM about the 2006 Toyota Sienna XLE Limited

Question type: Maintenance & Repair

got code po171 and po174 running lean on both banks
what can cause this problem

1 Answer

74,645

P0171 TOYOTA - Air/Fuel Mixture 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.... 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............................ P0174 TOYOTA - Air/Fuel Mixture System Too Lean Bank 2.... 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..... 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.

1 of 1 people found this helpful.

Your Answer

Toyota Sienna Experts

  • #1
    Mik00000
    Reputation
    1,610
  • #2
    Tom Demyan
    Reputation
    1,200
  • #3
    dandyoun
    Reputation
    970
View All

Related Models For Sale

Used Honda Odyssey
418 Great Deals out of 26,952 listings starting at $1,850
Used Toyota Highlander
470 Great Deals out of 30,403 listings starting at $1,900
Used Toyota Camry
929 Great Deals out of 80,592 listings starting at $1,440
Used Dodge Grand Caravan
275 Great Deals out of 25,940 listings starting at $2,795
Used Honda Pilot
507 Great Deals out of 35,416 listings starting at $500
Used Kia Sedona
144 Great Deals out of 7,861 listings starting at $1,995
Used Chrysler Town & Country
271 Great Deals out of 14,004 listings starting at $1,999
Used Toyota RAV4
710 Great Deals out of 45,655 listings starting at $1,195
Used Nissan Quest
59 Great Deals out of 2,801 listings starting at $1,850
Used Toyota 4Runner
277 Great Deals out of 22,870 listings starting at $2,300
Used Toyota Tacoma
577 Great Deals out of 44,301 listings starting at $2,200
Used Toyota Corolla
784 Great Deals out of 53,912 listings starting at $1,200
Used Chrysler Pacifica
40 Great Deals out of 30,868 listings starting at $1,999
Used Toyota Sequoia
124 Great Deals out of 5,446 listings starting at $2,499
Used Honda CR-V
758 Great Deals out of 56,072 listings starting at $1,750

Used Cars For Sale

2017 Toyota Sienna For Sale
21 Great Deals out of 14,073 listings starting at $21,495
2016 Toyota Sienna For Sale
64 Great Deals out of 1,846 listings starting at $17,995
2015 Toyota Sienna For Sale
51 Great Deals out of 2,393 listings starting at $12,995
2014 Toyota Sienna For Sale
77 Great Deals out of 1,804 listings starting at $10,997

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.