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

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.
221,025

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.

Your Answer:

RX

Looking for a Used RX in your area?

CarGurus has 1,158 nationwide RX listings starting at $4,995.

Postal Code:

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
33 Great Deals out of 838 listings starting at $7,498
Used Lexus ES
19 Great Deals out of 216 listings starting at $5,900
Used Acura MDX
48 Great Deals out of 878 listings starting at $3,999
Used Toyota RAV4
140 Great Deals out of 2,981 listings starting at $4,999
Used Lexus IS
15 Great Deals out of 399 listings starting at $5,999
Used Toyota 4Runner
22 Great Deals out of 521 listings starting at $14,995
Used Lexus LX
4 Great Deals out of 38 listings starting at $23,995
Used Honda CR-V
189 Great Deals out of 4,991 listings starting at $440
Used Toyota Camry
48 Great Deals out of 1,085 listings starting at $2,500
Used Lexus LS
3 Great Deals out of 34 listings starting at $5,995
Used Lexus GS
3 Great Deals out of 23 listings starting at $8,988

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.