p0174
Moderate
Mercedes-Benz · SUVs
System Too Lean Bank 2
Quick Answer
Error code P0174 on your Mercedes-Benz SUVs means: System Too Lean Bank 2. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
X243X247X254V167X167AMG GLB35 4MATIC 2024AMG GLC43 4MATIC 2024AMG GLC63 S 2024AMG GLE53 4MATIC+ 2024AMG GLE63 S 2024AMG GLS63 2024EQB 250+ 2024EQB 300 4MATIC 2024EQB 350 4MATIC 2024GLB250 2024GLB250 4MATIC 2024GLC300 2024GLC300 4MATIC 2024GLE350 4MATIC 2024GLE450 4MATIC 2024GLS450 4MATIC 2024GLS580 4MATIC 2024Maybach GLS600 2024
Likely Causes
How to Fix It
1
Check if P0171 is also present to determine if both banks are affected
2
Smoke test the intake system concentrating on Bank 2 components
3
Clean or replace the MAF sensor
4
Measure fuel pressure at the rail and compare to specifications
5
Inspect intake boots and gaskets on the Bank 2 side for deterioration
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
MAF sensor
Intake boot
Intake manifold gasket
Fuel pump module
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