Question about 2001 Toyota Corolla
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.
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
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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Posted on Jan 02, 2017
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the manual that came with the scan tool to decode.
There is a Toyota TSB for a Computer
There is a campaign for that, take it to your Dealer for repair, should be no charge
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