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PO171

Tiny
DAVIDLPHONES
  • MEMBER
  • 1998 TOYOTA TACOMA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 93,000 MILES
1998 toyota Tacoma code 171 is bank 1 running lean what is bank one and what would cause this problem

Saturday, February 12th, 2011 AT 2:14 AM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lean fuel condition could be caused by one of the following below:

1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.
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Saturday, February 12th, 2011 AT 2:19 AM
Tiny
TOYODAMASTERTECH
  • MEMBER
  • 25 POSTS
The number 1 cause of the p0171 on the Tacoma is a dirty mass air flow sensor. If you remove the MAF and clean it with electrical contact cleaner--any other cleaner could damage it. Clean the inside and outside of the sensor. If you have a K&N filter (or any filter with a oil on it) get rid of it!
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Wednesday, February 16th, 2011 AT 3:48 AM

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