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

Asked by Jun 04, 2017 at 06:34 PM about the 2000 Lexus RX 300

Question type: Maintenance & Repair

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

3 Answers

76,545

Maybe a bad O2 sensor.

520

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

73,655

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.

Your Answer

RX 300

Looking for a Used RX 300 in your area?

CarGurus has 8 nationwide RX 300 listings starting at $3,900.

Postal Code:

Lexus RX 300 Experts

  • #1
    Rx300_21001
    Reputation
    1,910
  • #2
    John Orlando
    Reputation
    1,010
  • #3
    mrsvirtuous
    Reputation
    690
View All

Related Models For Sale

Used Toyota Highlander
21 Great Deals out of 638 listings starting at $838
Used Toyota Tundra
24 Great Deals out of 870 listings starting at $2,500
Used Honda CR-V
48 Great Deals out of 2,576 listings starting at $1,895
Used Toyota Camry
54 Great Deals out of 1,905 listings starting at $1,688
Used Toyota RAV4
46 Great Deals out of 3,068 listings starting at $2,495
Used Acura MDX
32 Great Deals out of 498 listings starting at $2,980
Used Toyota 4Runner
6 Great Deals out of 426 listings starting at $5,990

Used Cars For Sale

2002 Lexus RX 300 For Sale
2 listings starting at $3,900
2001 Lexus RX 300 For Sale
1 listings starting at $4,388
2000 Lexus RX 300 For Sale
2 listings starting at $4,900

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.