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

79,005

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
    1,660
  • #2
    Tom Demyan
    Reputation
    1,220
  • #3
    dandyoun
    Reputation
    990
View All

Related Models For Sale

Used Honda Odyssey
387 Great Deals out of 31,896 listings starting at $1,990
Used Toyota Highlander
552 Great Deals out of 43,115 listings starting at $2,009
Used Toyota Camry
1,104 Great Deals out of 78,328 listings starting at $1,100
Used Honda Pilot
637 Great Deals out of 38,031 listings starting at $1,999
Used Dodge Grand Caravan
204 Great Deals out of 34,971 listings starting at $1,900
Used Toyota RAV4
676 Great Deals out of 63,266 listings starting at $1,995
Used Kia Sedona
103 Great Deals out of 7,547 listings starting at $700
Used Nissan Quest
60 Great Deals out of 2,740 listings starting at $2,500
Used Toyota 4Runner
349 Great Deals out of 29,856 listings starting at $1,500
Used Chrysler Town & Country
171 Great Deals out of 13,814 listings starting at $1,496
Used Toyota Corolla
924 Great Deals out of 71,092 listings starting at $1,479
Used Toyota Tacoma
555 Great Deals out of 41,981 listings starting at $2,500
Used Honda CR-V
784 Great Deals out of 63,574 listings starting at $1,495
Used Chrysler Pacifica
79 Great Deals out of 27,172 listings starting at $750
Used Toyota Sequoia
112 Great Deals out of 4,996 listings starting at $2,499

Used Cars For Sale

2018 Toyota Sienna For Sale
5,992 listings starting at $29,313
2017 Toyota Sienna For Sale
20 Great Deals out of 2,924 listings starting at $20,495
2016 Toyota Sienna For Sale
59 Great Deals out of 1,820 listings starting at $15,499
2015 Toyota Sienna For Sale
81 Great Deals out of 2,436 listings starting at $12,923
2014 Toyota Sienna For Sale
44 Great Deals out of 1,166 listings starting at $9,995

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.