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

21,555

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.
3,060

What Engine?

77,985

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.
3,060

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 2,199 nationwide Camry listings starting at $1,900.

ZIP:

Toyota Camry Experts

  • #1
    Reelin68
    Reputation
    14,350
  • #2
    Tom Demyan
    Reputation
    4,820
  • #3
    tenspeed
    Reputation
    3,090
View All

Related Models For Sale

Used Honda Accord
62 Great Deals out of 1,176 listings starting at $1,888
Used Toyota Corolla
209 Great Deals out of 3,613 listings starting at $1,494
Used Honda Civic
292 Great Deals out of 4,241 listings starting at $1,815
Used Nissan Altima
83 Great Deals out of 1,259 listings starting at $2,200
Used Toyota Avalon
4 Great Deals out of 139 listings starting at $6,495
Used Toyota RAV4
53 Great Deals out of 3,244 listings starting at $1,000
Used Hyundai Sonata
39 Great Deals out of 1,295 listings starting at $1,995
Used Toyota Highlander
14 Great Deals out of 911 listings starting at $4,950
Used Nissan Maxima
30 Great Deals out of 360 listings starting at $2,495
Used Honda CR-V
47 Great Deals out of 2,562 listings starting at $1,795
Used Chevrolet Malibu
97 Great Deals out of 1,769 listings starting at $888
Used Toyota Tacoma
37 Great Deals out of 1,216 listings starting at $4,444
Used Toyota 4Runner
13 Great Deals out of 527 listings starting at $2,995
Used Toyota Prius
4 Great Deals out of 113 listings starting at $4,000

Used Cars For Sale

2018 Toyota Camry For Sale
927 listings starting at $26,390
2017 Toyota Camry For Sale
16 Great Deals out of 174 listings starting at $15,900
2016 Toyota Camry For Sale
32 Great Deals out of 181 listings starting at $14,990
2015 Toyota Camry For Sale
8 Great Deals out of 142 listings starting at $12,366
2014 Toyota Camry For Sale
7 Great Deals out of 224 listings starting at $10,814

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.