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Mass Air Flow Sensor

Tiny
TOYOCEL04
  • MEMBER
  • 2004 TOYOTA CELICA
  • 1.8L
  • 4 CYL
  • FWD
  • MANUAL
  • 137,420 MILES
I bought my car used, its a 2004 Toyota Celica GTS and I had the code P0171 on the dash, so I started first by replacing the o2 sensors. Drove the car still had the code after I erased it and then I replaced the mass air flow sensor and then when I drove and started slowing down to come to a stop, my car would idle low and then sometimes stall. So, I am thinking it could be my mass air flow sensor being faulty. Would this cause the car to idle low and stall? Like I said my vehicle never stalled till I replaced the mass air flow sensor, this is why I would think it would be my problem.
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Friday, March 18th, 2016 AT 4:32 PM

6 Replies

Tiny
CAR-MAN145
  • MECHANIC
  • 321 POSTS
Yes it could be a faulty mass air flow sensor but would also check for a vacuum leak. Here are some guides that will help you.

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

and

https://www.youtube.com/watch?v=xN5pcM-5bso

please let us know how it goes
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Saturday, March 19th, 2016 AT 7:23 AM
Tiny
TOYOCEL04
  • MEMBER
  • 5 POSTS
I replaced all hoses, so I bought a brand new denso brand maf sensor and didn't see any stalling yesterday. I will drive again today and see.
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Saturday, March 19th, 2016 AT 2:58 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Did this fix the problem?
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Sunday, March 20th, 2016 AT 2:53 AM
Tiny
TOYOCEL04
  • MEMBER
  • 5 POSTS
So far it seems like it fixed the problem, long fuel trim back to normal, no more stalling or low idling, it may have fixed the problem. Thanks.
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Sunday, March 20th, 2016 AT 5:45 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
You are welcome please use 2CarPros. Com again
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Tuesday, March 22nd, 2016 AT 1:10 AM
Tiny
TOYOCEL04
  • MEMBER
  • 5 POSTS
Thanks
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Tuesday, March 22nd, 2016 AT 3:14 AM

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Mass Air Flow Sensor Replacement
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Mass Air Flow Sensor Replacement
After starting the engine post sensor replacement, the sensor instantly calibrates itself so there is no learn time required. This sensor is subject to debris and ...
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