DTC Detection Logic

The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity of the three way catalyst (manifold) causes the longer switching time. To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the maximum voltage of the sensor is sufficiently high during various driving conditions such as fuel cut.

Courtesy of NISSAN NORTH AMERICA, INC.

: 0.71 V

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P2271

O2 sensor signal bank 1 sensor 2

[O2 sensor signal biased/stuck rich bank 1 sensor 2]

The maximum voltage from the sensor does not reach the specified voltage.
ECM detects the heated oxygen sensor 2 heater circuit is short to ground.

Harness or connectors
(The heated oxygen sensor 2 circuit is open or shorted)
Heated oxygen sensor 2
Fuel pressure
Fuel injector
Intake air leaks