P2271 - and before that i had a p0171 i

Question

Had a p0171 bank 1 sensor 1 lean code checkfor intake leak or a dirty maf and fuel pressure at 55 psi i suspect the sensor clear code and it light up after 50km but a p2271 bank 1 sensor signal stuck at rich replace bank1 sensor 1 for the previews code and clear codes now customer left for work hope it was the front sensor that truth off the rear one can anybody help me on this one or give me a hint please

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Answer 1

P2271 Secondary H02S (sensor 2) circuit signal stuck rich

Sensor 2 is the catalytic sesnor or downstream sensor.As long as the ECT (engine coolant temperatue) is correct and there is no code for coolant temperature sensor the rear 02 sensor will require replacement.