2006 toyota corolla 1.8 sohc p0171 found dirty mass air flow cleaned results the same replaced it 2 days go by and again the same code pops up p0171 fuel fystem too lean bank 1 the down stream o2 is switching fine the a/f sensor is showing the correct voltage and responds fine when fuel or added air can not find a vac. leak either is there an answer or can anyone help thanks

Question 1

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Hi. I went to autozone and diagnosed with code p0172 on my 2005 Lexus GX470. I have vsc trac, vsc off, anti skid, and check engine light on. The lights come on for about 100 miles and goes off for same...

P0172 LEXUS - System Too Rich Bank 1
Possible causes
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Faulty Mass Air Flow (MAF) sensor
https://www.autocodes.com/p0172_lexus.html

Mar 13, 2018 • Lexus Cars & Trucks

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Toyota Corolla Code P0171 Check Engine light

Code P0171 on Toyota Corolla Q: What could cause the code P0171 on 2002 Toyota Corolla? A: The code P0171 reads "System Too Lean (Bank 1)". This means that the air-fuel mixture coming in to the engine is too lean, or there is too much air and too little fuel. This could be caused by a number of reasons, such as bad airflow sensor, vacuum leaks, low fuel pressure, clogged fuel injectors, etc. To know exactly what caused the problem, your mechanic can do a few tests.
From my experience, the airflow sensor problems are fairly common; sometimes the sensor just gets dirty and gives false air flow readings causing lean condition. Again, your mechanic can test it.
If the airflow sensor is causing the lean condition, it will need to be replaced. If the sensor is just dirty, your mechanic may suggest to clean it (cleaning the airflow sensor is very delicate procedure) as a temporary solution - sometimes this could work.

on Dec 07, 2009 • Toyota Corolla Cars & Trucks

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Type p0171

It is a generic OBD2 power train Code. The same solution could be applied to all other vehicles as well.
Error Code: P0171
Description:
Fuel Trim (FT), System too Lean, Bank 1
Possible Causes:
- Fuel pump pressure too high or regulating valve stuck closed.
- Intake/ exhaust leak.
- Secondary air injection (AIR) system.
- Manifold absolute pressure (MAP) sensor.
- Mass air flow (MAF) sensor.
- Fuel pressure/pump.
- Fuel Injector(s).
- Evaporative emission (EVAP) canister purge valve.
- Heated oxygen sensor (HO2S).
Solutions:
-Usually, simply cleaning the Mass air flow (MAF) sensor helps solve the problem.
- It is best to take MAF off and spray it with electronics cleaner or high flash point solvent.
- Inspect all vacuum and PCV hoses, replace if necessary.
- Check for a dirty fuel filter and proper fuel pressure.

Sep 26, 2013 • 2000 Toyota Corolla

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P0171 2005 toyota matrix

I found a YouTube video, MAF Sensor Cleaning in Slow Motion-rzrDIRZ-ccs.webm, that showed me how to remove the mass air flow sensor and spray clean it with CRC mass air flow sensor cleanser. I bought the kit (single use of Mass Air Flow Sensor Cleaner and Throttle Body and Air-Intake Cleaner at Walmart for $7.99 in store price) and cleaned the mass air flow sensor. Then I reset the check engine light by removing and replacing the negative battery terminal. It worked. The check engine light has stayed off. I have a 2005 Toyota Matrix.

Sep 27, 2012 • 2005 Toyota Matrix

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OBD2 P0171, P0133 & P2195 on 2004 Toyota Corolla?

Consult the manual that came with the scan tool to decode.

There is a Toyota TSB for a Computer malfunction.
There is a campaign for that, take it to your Dealer for repair, should be no charge

http://www.xcardiag.com/wholesale/high-quality-toyota-intelligent-tester2-it2-with-suzuki-47.html

May 22, 2012 • Cars & Trucks

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My wife's 2000 Toyota Corolla died today when she was at a stop light. She had to start it again and was able to drive but it has some hesitation problems and poor acceleration at times. I did remove...

the po300 code is for a cylinder misfire, usually followed by a last number of 1 2 3 ect, showing which cylinder is misfiring, normally this can be fixed by installing a new set of plugs, the po171 code could be this

The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
There could be a vacuum leak downstream of the MAF sensor. you cleaned that but it could be fouling out you could also have this happening
- Inspect all vacuum and PCV hoses, replace if necessary
- Check for a dirty fuel filter and proper fuel pressure

Jun 21, 2011 • 2000 Toyota Corolla

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What is engine code P0171 for 2005 Toyota corolla?

What does that mean? Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.
Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.
Symptoms You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
Causes A code P0171 may mean that one or more of the following has happened:

The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
There could be a vacuum leak downstream of the MAF sensor.

Dec 08, 2010 • 2005 Toyota Corolla

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My engine light is on, and its code P0171 (System too lean Bank 1). Its toyota corolla VE 200. How do i fix it ? I am looking for mass air flow in my car ? I dont know where it is located ?

Remove the two screws that hold the MAF on the intake near the air filter, go to an auto parts store or electronic supply place and get a can of spray electronic cleaner, spray the inside of the air flow sensor, you need to get it into the small opening where the platinum sensor wires are, they get coated with dust and other gunk and confuse the computer because it gets the wrong signals,clean the wires until the look shiny, reinstall it, you may be able to clear the check engine light by disconnecting the battery and waiting 10 seconds, also replace the air filter and you should be good to go. ------- Check fig:--

Mass air flow sensor. Located in the intake near the airbox. 2 screws hold it in. Thanks.

Sep 26, 2010 • 2000 Toyota Corolla

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ODBII Code P0300 on a 2005 Corrolla Hard cold start P0171 Code after engine warms up.

Hello. The P-0300 indicates a multi-cylinder misfire. The P-0171 code indicates a dirty Mass Air Flow sensor.

Remve the MAF from the intake tube, between the air filter box, and the throttle body. Inspect the interior of it, look for 2 small wires. If they are dirty, or fuzzy, clean them by spraying brake cleaner on them, until they are clean. Don't use compressed air, you will damage the wires. After the sensor is cleaned, reinstall it and drive the car. The clean wires will then retransmit the correct airflow, and the computer will re-learn the correct values.

Dec 23, 2009 • 2005 Toyota Corolla

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Code 171 and engine light is on

--BANK 1 = DTCs P0171 (lean) and P0172 (rich)

-Check intake air system for leaks, obstructions and damage.
-Check air cleaner element, air cleaner housing for blockage.
-Verify integrity of the PCV system.
-Check for vacuum leaks.

I would try cleaning the Mass Airflow Sensor first. A dirty Mass Airflow Sensor is a common problem for triggering PO 171 & 174 codes.

Good luck and keep me posted.

Oct 21, 2009 • Chevrolet Colorado Cars & Trucks

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Anonymous

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Either the mass-air sensor is bad, which normally throws a mass-air voltage code, or you definitely have an air leak post the mass-air. Smoke the intake manifold with a smoke machine or spray the whole intake to head, including to brake booster with brake cleaner and listen for a change in idle. Focus on the gasket surface of the intake manifold.

Dave C Dec 15, 2010

I think Andy is probably on the right track with the intake manifold gasket but I just wanted to mention that a quick search revealed 3 TSB's for this code, I stole this off a Toyota forum just by googling it:

#1 is for a new engine ECU -- 8yr/80k miles warranty

#2 is for a INTAKE manifold GASKET in subfreezing conditions -- 3yr/36k mile warranty

#3 is for a A/F sensor (not O2) -- 3yr/36k mile warranty

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Answer 2

Anonymous

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Posted on Dec 17, 2011

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Did u change the intake gasket,

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