P1149 – Closed Loop Control (Bank 2, Nissan)

Description

The ECM detected improper closed-loop fuel control on Bank 2.

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Symptoms

Poor fuel economy
Rough idle
Hesitation
Rich or lean mixture
Check engine light

Causes

Faulty O2 sensor
Fuel pressure issue
Vacuum leak
Injector problem
ECM control fault

Diagnosis

Check fuel trims
Inspect O2 sensor
Test fuel pressure
Scan live data

Repair

Replace O2 sensor
Repair vacuum leaks
Fix fuel pressure issues
Service injectors