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What is error code 171 on a scion xa

 
AMEDEE's Avatar
  • Answered by:AMEDEE
  • TOYOTA TECHNICIAN
  • Positive Feedback: 95.2 %
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Customer Question

what is error code 171 on a scion xa

 

Country: United States
Make: Toyota
Model: scion xa
Year: 2006

Submitted: 609 days and 11 hours ago.
Category: Toyota
Value: $27
Status: CLOSED
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Expert:  AMEDEE replied609 days and 11 hours ago.

Hello!

Is this a code p0171?

Customer replied609 days and 11 hours ago.

yes code p0171

Accepted Answer

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Expert:  AMEDEE replied609 days and 11 hours ago.

This is a lean code. you could have a bad mass air flow sensor. Or the snorkel from the mass air flow sensor to the throttle body could be ripped. Both are very common and can cause you vehicle to loose power along with many other drive ability issues. First look for cracks or rips or anywhere air can enter the engine that is not accounted for by the mass air flow sensor. Next comes the Mass Air Flow (MAF) sensor. This is a very important sensor input to the computer. It uses a hot wire sensing element to measure the amount of air entering the engine. The MAF sensor then outputs an analog voltage signal to the PCM proportional to the intake air mass. The PCM calculates the required fuel injector pulse width in order to provide the desired air/fuel ratio. If the sensor is bad than this air/fuel ratio will be off causing severe performance issues. In extreme cases, I have seen these two problems cause a no start condition. This input can also be used in determining transmission Electronic Pressure Control, shift and torque converter clutch scheduling. The check engine light may even pop on if the sensor is bad, the snorkel is ripped or a tube has fallen off. This will result in a lean condition.

I hope this helps! Please don't forget hit the green accept button so that I may get credit for the time that I have spent with you. This is necessary for me to be paid for my work and get credit for assisting you. Your question will not close, and you will still have the opportunity to follow-up if needed. Leaving a bonus and positive feedback is not required, but doing so is certainly appreciated!

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AMEDEEAMEDEE40834.8251868056

Expert TypeTOYOTA TECHNICIAN
Category: Toyota
Pos. Feedback: 95.2 %
Accepts: 1098
Answered: 10/18/2011

Experience: ASE MASTER TECHNICIAN ADVANCED LEVEL SPECIALIST

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Customer replied609 days and 10 hours ago.

what is the replaement cost for the mass airflow sensor?

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Expert:  AMEDEE replied609 days and 10 hours ago.

Thanks for the accept!

According to my references, the O.E. part number for this mass air flow sensor is 222040D030. The price is $156.84 Of course you may be able to get it cheaper at a auto parts store, but I would not recommend it.

Customer replied609 days and 10 hours ago.

thank you

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Expert:  AMEDEE replied609 days and 10 hours ago.

You bet!

 
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