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P0171 code

Tiny
ALZACK41
  • MEMBER
  • 2000 TOYOTA AVALON
  • 3.0L
  • V6
  • FWD
  • AUTOMATIC
  • 140,000 MILES
B1S1 and B2S1, just replaced with Toyota Genuine Air/Fuel sensor.

P0171 code still came on after three hours driving.

Can old downstream Oxygen sensor trigger that code, and should I also renew it?
Friday, January 20th, 2017 AT 4:31 AM

2 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
I would be looking for a vacuum leak before changing a o2 sensor that is usually what sets lean codes.
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Friday, January 20th, 2017 AT 6:58 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Also, down stream o2 sensor just helps check the health of the catalytic converter.
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Friday, January 20th, 2017 AT 6:59 AM

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