P2177

System Too Lean Off Idle Bank 1

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Unstable engine operation
Power Loss
Increased fuel consumption
Check Engine Light Is On
Dips during acceleration

Causes

Vacuum leak
Malfunction of the mass air flow sensor (MAF)
Dirty or faulty fuel injectors
Oxygen (O2) sensor malfunction
Problems with the fuel pump or pressure regulator

How to Fix

Check the system for vacuum leaks
Check the operation of the mass air flow sensor and clean or replace if necessary
Check the condition of the fuel injectors
Check the operation of the oxygen sensor
Check the fuel pressure in the system

Related codes

P0171 P0172 P0174