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

85,625

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.

2 people found this helpful.

Your Answer:

Toyota Sienna Experts

  • #1
    Mik00000
    Reputation
    1,700
  • #2
    Tom Demyan
    Reputation
    1,300
  • #3
    dandyoun
    Reputation
    1,040
View All

Related Models For Sale

Used Honda Odyssey
456 Great Deals out of 34,836 listings starting at $1,200
Used Toyota Highlander
393 Great Deals out of 51,308 listings starting at $1,664
Used Honda Pilot
335 Great Deals out of 46,940 listings starting at $750
Used Toyota Camry
882 Great Deals out of 72,153 listings starting at $1,000
Used Dodge Grand Caravan
278 Great Deals out of 29,797 listings starting at $1,900
Used Kia Sedona
150 Great Deals out of 8,444 listings starting at $1,850
Used Toyota RAV4
653 Great Deals out of 76,409 listings starting at $1,995
Used Chrysler Pacifica
115 Great Deals out of 29,410 listings starting at $2,000
Used Toyota 4Runner
251 Great Deals out of 33,888 listings starting at $1,995
Used Chrysler Town & Country
286 Great Deals out of 12,429 listings starting at $1,999
Used Toyota Sequoia
100 Great Deals out of 5,394 listings starting at $2,000
Used Toyota Corolla
748 Great Deals out of 64,215 listings starting at $1,495
Used Nissan Quest
53 Great Deals out of 2,259 listings starting at $2,300
Used Toyota Tacoma
431 Great Deals out of 49,987 listings starting at $2,695
Used Honda CR-V
776 Great Deals out of 77,236 listings starting at $100

Used Cars For Sale

2018 Toyota Sienna For Sale
13,309 listings starting at $28,778
2017 Toyota Sienna For Sale
17 Great Deals out of 1,974 listings starting at $17,144
2016 Toyota Sienna For Sale
30 Great Deals out of 806 listings starting at $14,990
2015 Toyota Sienna For Sale
57 Great Deals out of 2,438 listings starting at $11,468
2014 Toyota Sienna For Sale
14 Great Deals out of 681 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.