Possible causes
– Faulty air fuel ratio (A/F) sensor 1 heater Bank 1
– Air fuel ratio (A/F) harness is open or shorted
– Air fuel ratio (A/F) circuit poor electrical connection
– Air fuel ratio (A/F) harness is open or shorted
– Air fuel ratio (A/F) circuit poor electrical connection
When is the obd code mean?
The A/F signal computed by ECM from the A/F sensor 1 signal is constantly approx. 0V.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Possible rough engine idle
– Possible rough engine idle
P1271 NISSAN OBD Code Description
The A/F sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement