Question about 2001 Toyota Corolla

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2001 Toyota Corolla computer code

Just failed inspection with a computer code of P0171. What does this indicate ? Don't want to be ripped off at dealer with unneeded, additional repairs. Mileage is 125K.
Thank you.

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  • Anonymous May 22, 2009

    where is the mass flow air meter located on a 2001 toyota corolla

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  • Toyota Master
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P-0171 indicates an issue with the Mass AirFlow Sensor. It is probably dirty. Locate this device on the intake tube, between the Air filter and the intake manifold. Remove the wire connector. Remove the 2 phillips screws that holds it onto the air tube. Using a flashlight, examine the interior of the sensor. You will see 2 small wires. If they look "fuzzy", or if there is any debris on them, this is your problem. Using brake cleaner spray (get it at a parts store), spray the interio until the wires are super clean. Do NOT use compressed air to clean it, the air pressure will break the wires, rendering the sensor useless. Refit the sensor, and drive it for a while, the light will eventiually go out when the ECM relearns the signal from the now-clean sesnor. Hope this helps, and thanks for using FixYa. Let me know what you find inside the sensor.

Posted on Nov 29, 2008

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  • Contributor
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THIS IS A "SYSTEM LEAN" CODE. USUALLY FIXED WITH A MASS AIR FLOW METER. ITS A 2" X 2" BOX ON THE AIR BOX (WHERE THE AIR FILTER GOES) UNPLUG IT, TAKE OUT THE 2 PHILLIPS SCREWS THAT HOLD IT IN AND LOOK INSIDE, IF IT APPEARS TO HAVE A GREY COLOR ON THE WIRES INSIDE. ITS TIME FOR REPLACMENT. ITS EASY TO DO BUT THE PART MAY RUN YOU $150-300

Posted on Nov 27, 2008

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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.
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