P1148 – Closed Loop Control (Bank 1, Nissan)

Description

The ECM detected improper closed-loop fuel control on Bank 1.

Need More Than Just the Fault Code?

A diagnostic scanner with live data, freeze-frame information and the right system access can help you investigate the actual cause before replacing parts.

Compare Diagnostic Scanners

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