P0171 code

2000 TOYOTA AVALON
140,000 MILES • 3.0L • V6 • FWD • AUTOMATIC
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ALZACK41
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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?
Jan 20, 2017 at 4:31 AM
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SATURNTECH9
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I would be looking for a vacuum leak before changing a o2 sensor that is usually what sets lean codes.
Jan 20, 2017 at 6:58 AM
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SATURNTECH9
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Also, down stream o2 sensor just helps check the health of the catalytic converter.
Jan 20, 2017 at 6:59 AM
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