P1173 – Fuel Trim Rich (Bank 2, Nissan)

Description

The ECM detected an excessively rich fuel mixture on Bank 2.

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Symptoms

Poor fuel economy
Black smoke
Rough idle
Fuel smell
Check engine light

Causes

Leaking injector
Faulty O2 sensor
High fuel pressure
MAF sensor fault
ECM control issue

Diagnosis

Check fuel trims
Inspect injectors
Test fuel pressure
Scan live data

Repair

Repair injector
Replace O2 sensor
Fix fuel pressure issue
Clean MAF sensor