I have a 2002 Toyota Camry. I am getting an Chefck Engine Light error code of P0171. I have no idea what is causing this issue. I have replaced the spark plugs, mass airflow sensor, and

Asked by Mar 01, 2017 at 02:01 AM about the 2002 Toyota Camry

Question type: Maintenance & Repair

I am at a loss for what I should do.....

4 Answers

18,685

Check that the connection for boot between the air filter and the throttle body is good. Or remove the intake boot from the throttle body and clean the throttle plate and bore and/or remove the throttle body unit and clean it (with throttle body cleaner)and put a new gasket on it if its leaking there (may be where the extra air is getting in). look for vacuum leaks or bad (dirty needs cleaning with throttle body cleaner) PCV valve. After that is done remove the negative battery cable for about 5 minutes to reset the memory and start the vehicle in drive it. If light comes back on then you could have restricted fuel injectors (use fuel injection cleaner first then remove and have cleaned or replaced if needed)or possibly a fuel filter that is restricted and need replacing. Intake air leaks (needs intake gasket). Faulty front heated oxygen sensor (check wires or replace). Ignition misfiring (needs tune up or coils). Incorrect fuel pressure( may need filter or pump or regulator). Exhaust gas leaks(before 02 sensor).

1 of 1 people found this helpful.
2,020

What Engine?

73,865

Do as enginecreator suggest, make sure and use the appropriate MAF cleaner for cleaning the MAF... 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.

1 of 1 people found this helpful.
2,020

What Engine? With due consideration to the above suggestions...may I suggest doing the cheapest and easiest replacement first. Replace the pre-CAT O2 sensor.

Your Answer

Camry

Looking for a Used Camry in your area?

CarGurus has 72,976 nationwide Camry listings starting at $295.

ZIP:

Toyota Camry Experts

  • #1
    Reelin68
    Reputation
    13,500
  • #2
    Tom Demyan
    Reputation
    4,630
  • #3
    tenspeed
    Reputation
    3,010
View All

Related Models For Sale

Used Honda Accord
1,088 Great Deals out of 60,850 listings starting at $1,099
Used Toyota Corolla
872 Great Deals out of 55,985 listings starting at $1,488
Used Honda Civic
792 Great Deals out of 72,306 listings starting at $1,350
Used Nissan Altima
953 Great Deals out of 74,806 listings starting at $1,300
Used Toyota Avalon
208 Great Deals out of 16,903 listings starting at $1,988
Used Toyota RAV4
787 Great Deals out of 49,327 listings starting at $1,500
Used Hyundai Sonata
665 Great Deals out of 49,539 listings starting at $500
Used Nissan Maxima
274 Great Deals out of 23,104 listings starting at $799
Used Toyota Highlander
441 Great Deals out of 27,466 listings starting at $1,999
Used Honda CR-V
817 Great Deals out of 53,890 listings starting at $1,750
Used Toyota 4Runner
287 Great Deals out of 21,661 listings starting at $1,750
Used Toyota Tacoma
625 Great Deals out of 42,240 listings starting at $1,500
Used Chevrolet Malibu
1,038 Great Deals out of 70,417 listings starting at $2,499
Used Toyota Prius
312 Great Deals out of 16,798 listings starting at $1,500

Used Cars For Sale

2018 Toyota Camry For Sale
31,096 listings starting at $20,828
2017 Toyota Camry For Sale
39 Great Deals out of 7,312 listings starting at $13,495
2016 Toyota Camry For Sale
112 Great Deals out of 5,856 listings starting at $9,995
2015 Toyota Camry For Sale
125 Great Deals out of 5,105 listings starting at $9,889
2014 Toyota Camry For Sale
291 Great Deals out of 7,203 listings starting at $8,800

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.