Question about 2002 Toyota Corolla

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I have a 2002 toyota corolla I had a code reading of po100 po110. I then replaced MAF; Dealership aftermarket, air filter, oil change. Check engine light still on. I have tags up. Smog needed. Code are the same so I go and look find it was a leak from the intake mainfold gasket. Replaced it and after closing it up. Car would turn over and turn off if gas applied. Car is backfireing. MakeMakes a sound if coming from intake, as if large hole was there. And makes a pop. Replaced sparks. Dealer sparks. Same problem. Cylinder 4 is misfiring. Code now same po 110 100 now 304 302. I need help asap. Daily work car

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  • 87 Answers

Theres a vacuum line off under the throttle body when you removed the intake manifold it probably got pulled off also its very hard to see

Posted on Nov 25, 2014

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Posted on Jan 02, 2017

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SOURCE: engine check light read p0171 and p0420, noticed a leak of engine oil on cylinder 2 area of head gasket when checking the sparks plug, is that the cause?

may be oil feed to cylinder head replace gasket

Posted on Apr 20, 2009

kd6rhd56
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SOURCE: I have a 2001 Mercury Sable the check engine light

First I recommend you get an auto repair/maintence manual for about 20.00. by Chilton or Haynes then check trouble codes for your sable, this manual is reasonable and will aid you in any further and future repairs. this manual is the type I use, I work on or vehicles-( shady tree mechanic)

Posted on Jul 11, 2009

  • 1986 Answers

SOURCE: Code number PO100- air flow sensor, volume airflow

Those sensors are actually connected to your air intake pipe just after your air filter. They're just plug and play sensors.

Posted on Aug 21, 2009

  • 144 Answers

SOURCE: 2004 Audi A4 misfire

it is always a good idea to stay with o.e.m parts and yes there is updated parts in the newer coils. and yes the M.A.F will also cause misfire faults but will not make check engine light flash or make car shake and shudder. also check you wire harness going to your coils make sure your ground wires are not cracked. That could be the main culprate. good luck hope this helps

Posted on Sep 03, 2009

  • 47 Answers

SOURCE: Check Engine light code 1506

this code indicates under-speed error has ocurred.
sets when PCM detects idle speed is 100 RPM lowerthan expected for 14 sec while break pedal depressedand steering wheel is straight ahead.

possible causes: IAC valve failure,intake leak,throttle body failure,opens or shorts in wiring between IAC and PCM.

Posted on Sep 16, 2009

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My 2002 toyota corolla check engine light on changed cat,oxgen sensor,fuel sensor new spark plugs.. still has the p0171 code what do I fix now Help!!


This code reffers to a Mass air flow sensor or(MAF) Check the connections and /or replace it. Good luck.

Jul 30, 2011 | 2002 Toyota Corolla

1 Answer

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

1 Answer

Had codepo101 , replaced MAF sensor, cleaned air filter. ran it fora couple miles , service engine light came back on . code po101 back. any ideas??


First make sure the air filter is new or at least clean. If you are using an aftermarket enhancement air filter (like K&N) make sure it isn't over-oiled (the oil will affect the sensors in the MAF) (mass air flow), and contaminate the reading of air volume going to the engine. If the ECM can't monitor or regulate the air flow it will set this code and ignore the input form the MAF. In some cases the MAF wiring was to blame, bad connections, or corrosion.

Jan 29, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

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

2 Answers

My 2001 toyota corolla stalls out when cold


It is registering engine too lean due to either too much air entering the engine via an intake leak or by an inaccurate reading from the MAF.

Often on these cars, particularly if they have used Toyota brand air filters, the MAF collects fuzz over time from the air filter.
As this 'fuzz' collects on the MAF element, it acts as an insulator and skews the airflow reading for the ecm; it sees less air than is actually going through, so when it checks your mixture on the way out of the engine it realizes that there is more air than it thought was going in.

Pull your MAF out of the air hose (two philips screws) and clean it with non-chlorinated brake cleaner or "MAF cleaner" available at your local parts store. Look in there with a flashlight, you will see a little coiled wire covered in little bits of fuzz before you start.

Do NOT touch the element, just use the cleaner to blast it clean. Let it air dry completely before reinstalling.



Clear the code and call it a day!

Sep 15, 2009 | 2001 Toyota Corolla

3 Answers

Check engine light on a 2001 Toyota Corolla


No need to replace the MAF. If it was bad, the check engine light would have come right back on as soon as you started the engine. The MAF not only measures the air going into the engine, but also measures the air temperature. Those 2 circuits are constantly sending info the the ECU. If either would fail, the ECU would light the check engine light. P0171 is a common code for incorrect readings (dirty) in the MAF. Cleaning it always helps, and cuts off the light. Your acceleration problem may be either a wrong Air-Fuel sensor (the one before the cat), or an "aftermarket" AF sensor. "Aftermarket" AF sensors have been shown to not work properly in Toyota vehicles. Hope this helps

Sep 27, 2008 | 2001 Toyota Corolla

3 Answers

Another problem on my 2001 Toyota Corolla - P0171 system too lean


If you had a bad MAF, the check engine light would have come on instantly. Replacing the MAF will NOT cure your issue. P-0171 is a common code, and cleaning it always eliminates the P-0171. Regarding the sensor, there are 2 different ones, and they do NOT interchange. If your body shop put in an "aftermarket" air-fuel sensor (the one closest to the engine), you can expect hesitation issues.

Sep 27, 2008 | 2001 Toyota Corolla

1 Answer

Poor idle, power loss off idle then takes off if you give it more throttle like a quarter more pedal, engine code says bank 2 is to lean


You need a new MAF (mass air flow sensor or air flow meter as its called). and you will also need a new air filter, since you most likely used aftermarket one and that's what killed that MAF sensor/meter. Aftermarket air filters dont sit right in the box and are not oil soaked, which helps to catch any debris and dirt coming into your engine. Replace you air filter with Nissan filter and install a new MAF/air flow meter. If your air box is dirty, clean that out too. MAF sensor will run you about $500 and the air filter about $17. Common problem on a Sentra if you are not using Nissan air filter.

Aug 02, 2008 | 2002 Nissan Sentra

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