What are the common causes of P2189?

A dirty or faulty mass airflow sensor. An intake manifold or vacuum leak. A weak oxygen sensor on bank 2. Clogged or dirty fuel injectors on bank 2. Low fuel pressure or a weak fuel pump.

Read the idle fuel trims on bank 2 on a scan tool. Check for intake and vacuum leaks. Clean the mass airflow sensor. Check the fuel pressure and the injectors. Replace the bank 2 oxygen sensor if its signal is lazy. Clear the code and retest.

P2189

System Too Lean at Idle Bank 2

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

What it means

P2189 means System Too Lean at Idle Bank 2.

Check these first

A dirty or faulty mass airflow sensor
An intake manifold or vacuum leak
A weak oxygen sensor on bank 2
Clogged or dirty fuel injectors on bank 2
Low fuel pressure or a weak fuel pump

What to do next

Read the idle fuel trims on bank 2 on a scan tool
Check for intake and vacuum leaks
Clean the mass airflow sensor
Check the fuel pressure and the injectors
Replace the bank 2 oxygen sensor if its signal is lazy
Clear the code and retest

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Updated

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