What are the common causes of P2179?

Low fuel pressure or a weak fuel pump. Clogged or dirty fuel injectors on bank 2. A mass airflow or manifold absolute pressure sensor fault. An intake manifold or vacuum leak. Worn spark plugs or ignition coils.

Read the fuel trims on bank 2 on a scan tool. Check for intake and vacuum leaks. Check the fuel pressure and the injectors. Check the mass airflow or MAP sensor reading. Replace worn spark plugs or ignition coils. Clear the code and retest.

P2179

System Too Lean Off Idle Bank 2

System: Fuel and air metering (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P2179 means System Too Lean Off Idle Bank 2.

Check these first

Low fuel pressure or a weak fuel pump
Clogged or dirty fuel injectors on bank 2
A mass airflow or manifold absolute pressure sensor fault
An intake manifold or vacuum leak
Worn spark plugs or ignition coils

What to do next

Read the fuel trims on bank 2 on a scan tool
Check for intake and vacuum leaks
Check the fuel pressure and the injectors
Check the mass airflow or MAP sensor reading
Replace worn spark plugs or ignition coils
Clear the code and retest

Look up another code

Code or symptom

Enter a full code or a symptom. Press / to search. How to read a code

Type a code above, or start from a symptom or a common code.

Updated

Generic SAE J2012 definition. Last updated 2026-10-10.