Question about 2001 Toyota Corolla

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My 2001 Corolla displays P0171 after it idles for a minute or two. If I drive it hesitates (especially under hard acceleration) and starts also displaying P0300, P0301, and P0302. If I clear the codes and again allow it to idle for 1-2 minutes it again displayes P0171. Idle is smooth the whole time (at least after it's warmed up). Lastly, it cranks too long when starting, especially when the engine is still cold.

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  • Toyota Master
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Po171 is lean on bank 1--===causes --MAF/VAF sensors --injectors ---HO2S (heated oxygen sensor)
po300 is random misfires and po301, 2, 3 4 5 6 etc is the cylinder that is misfiring
most likely that the fuel pressure is below the required pressure either from the pump or blocked filter or the tank not venting properly--- (EVAP) problem
check the fuel pressure ( minimum of 45-65psi) --problem pressure regulator , pump or filter
replace the heated oxygen sensor on bank 1 ( in the exhaust manifold before the cat converter) as it reports to the ECM to get the correct air/fuel mix

Posted on Jul 19, 2017

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Posted on Jan 02, 2017

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  • 15 Answers

SOURCE: V6 engine idles rough after restarting, then smooths out

My first guess would be a dirty carb/fuel injector set. Run some fuel cleaner through the tank and see if it gets better. You might have to do it through a couple of tanksful. How long since you've had a tune-up? It might just be that time.

Posted on Nov 15, 2008

  • 73 Answers

SOURCE: 1994 Toyota Corolla hard to start when warm

does it have a cold start injector seperate from the other injectors usually on the upper intake somewhere with a fuel line going to it

Posted on Apr 15, 2009

  • 1986 Answers

SOURCE: 12 codes; 90174, p0171, p0175,p0300,p0301, p0302,

90174 (guessing it should be p0174 = system too lean)
92198 (guessing it should be p2198 = Oxygen Sensor Stuck Too Lean / Rich)

p0171, p0175 = system too lean (usually related to MAF Sensor)
p0301= Cylinder 1 Misfire Detected (Coil related most likely)
p0302 = Cylinder 2 Misfire Detected (Coil related most likely)
p0303 = Cylinder 3 Misfire Detected (Coil related most likely)
p0316 = Cylinder Misfire Detected (Coil related most likely)
p0420 = Catalyst System Efficiency Below Threshold
p2195, p2196 = Oxygen Sensor Stuck Too Lean / Rich (most likely the rubber hose from valve cover to throttle body

You may want to have your MAF changed, Coils changed, and your O2 Sensor checked. Also any one of those faults can also trigger another fault. I.E your O2 sensor could be could, but since it's misfiring, it's being triggered because the exhaust gases aren't what it should be. Hope this helps


Posted on Aug 21, 2009

Testimonial: "Thanks, you was very helpful. Since I got the codes the engine lock up on me. The car light comes on but the car would not start. I had it towed. "

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SOURCE: O2 Sensor Problem?

yes an o2 sensor can cause those symptoms so can a minor vacuum leak --bad ignition wire -clogging fuel filter --sticking egr valve etc.

Posted on Mar 01, 2010

mecanica03
  • 902 Answers

SOURCE: TOYOTA CELICA 2003 CYLINDER 3 MISFIRING IDLE ROUGH

this a tipical simptom of dirty fuel injectors, make a clean on gaae shop

Posted on Jul 16, 2010

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P0308 code intermintently pops up can i pass smog


  • Check Engine Lightflashing
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My 1991 Toyota Corolla drives fine and then suddenly it starts to hesitate.


mine did the same thing and it was oxygen sensor
since engine light came on there should be an error code
on computer.Get a diagnostic checker or take to a garage and have them hook uo to the diag connector. I bought a diagnostic checker few years ago and it has come in very handy
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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

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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.

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Corolla, 2001


did you get the car on computer to see what our check engine light i seen problem with temperature sensor the temperature sensor if it defect let say in morning its colder like 60 degre 15 celcius but the sensor is reading 80 degre the computer will not give the same anough of gas hard start not enough gas hesitation hope it FIXYA our problem thanks pierre

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