FixVault

Home › Infiniti › 2021 › QX50 Essential, 4WD › Repair and Diagnosis › Engine Performance › System › Engine Control System (DTC/Circuit Diagnosis) (5 Of 5) › DTC/Circuit Diagnosis › DTC P2271: O2 Sensor Signal Bank 1 Sensor 2 › DTC Description › Possible Cause

Possible Cause

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