P1171 – HO2S2 Heater Control (Bank 2 Sensor 2, Nissan)

Description

The ECM detected a malfunction in the heater circuit of the downstream O2 sensor on Bank 2.

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Symptoms

Poor fuel economy
Slow closed-loop operation
Check engine light

Causes

Faulty O2 sensor heater
Blown fuse
Damaged wiring
Connector corrosion

Diagnosis

Test heater resistance
Inspect wiring
Check fuses
Scan live data

Repair

Replace O2 sensor
Repair wiring
Replace fuse
Clean connectors