left bank lean mixture -MAF filter cleaned -problem returned -code P0171

Asked by Guru9DQXJ Jun 04, 2017 at 06:34 PM about the 2000 Lexus RX

Question type: Maintenance & Repair

left bank lean mixture -MAF filter cleaned -problem returned -code P0171

3 Answers
3,550

Lonetech answered 6 years ago

If no vacuum leaks detected. Hook a scanner to it and go to data and monitor load percentage. Take out on an area you can run it. Get in open stretch and go wot. If load percentage does not reach in the 90% or better. You have a bad mass air flow sensor

1 people found this helpful.
Mark helpful
220,965

Rowefast answered 6 years ago

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 replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.

3 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • left bank lean mixture -MAF filter cleaned -problem returned -code P0171 3 Answers

    left bank lean mixture -MAF filter cleaned -problem returned -code P0171

    2000 Lexus RX

    -

    Maintenance & Repair

  • Scan code P0171 for 1999 Lexus RX 300 6 Answers

    My wife drives the 1999 Lexus RX 300. The check engine light came on recently. We diagnosed with code P0171 for too lean bank 1. We did clean the MAF sensor but the problem is still there. We also s...

    1999 Lexus RX 300 AWD

    -

    Maintenance & Repair

  • Code p0171 1 Answer

    I have a Lexus rx300 2000 and it has a code P0171. When i stop at the light the RPM needle going crazy and the car chock. Can anybody explain what the problem is?

    2000 Lexus RX 300 AWD

    -

    Maintenance & Repair

  • bank 2 sensor 2 2 Answers

    where is bank 2 sensor 2 located

    2004 Lexus RX 330 AWD

    -

    Maintenance & Repair

  • Is there anyone out there without a problem with the Lexus RX 300? 7 Answers

    Is there anyone out there without a problem with the Lexus Rx300? I bought mine from an Independent. I'm a Disabled Veteran and had a doctor appointment the very next day in Lexington, KY which is abo...

    2001 Lexus RX 300 AWD

    -

    Maintenance & Repair

RX

Looking for a Used RX in your area?

CarGurus has 1,219 nationwide RX listings starting at $4,995.

Postal Code:

Shortcuts

Search Lexus RX Questions

CarGurus Experts

  • #1
    tenspeed
    Reputation
    8,310
  • #2
    Papaobewon
    Reputation
    5,490
  • #3
    Nicolaos Vlachos
    Reputation
    5,050
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Toyota Highlander
44 Great Deals out of 816 listings starting at $7,498
Used Acura MDX
40 Great Deals out of 898 listings starting at $5,999
Used Lexus ES
13 Great Deals out of 211 listings starting at $5,900
Used Toyota RAV4
124 Great Deals out of 3,046 listings starting at $4,999
Used Toyota 4Runner
26 Great Deals out of 542 listings starting at $9,999
Used Lexus IS
22 Great Deals out of 431 listings starting at $4,400
Used Lexus LX
39 listings starting at $22,998
Used Toyota Camry
46 Great Deals out of 1,149 listings starting at $2,500
Used Honda CR-V
183 Great Deals out of 4,989 listings starting at $440
Used Lexus GS
6 Great Deals out of 24 listings starting at $9,999
Used Lexus LS
30 listings starting at $5,995

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. Content will be removed if CarGurus becomes aware that it violates our policies.