Mercedes-Benz Error Code P0174: How to Fix It

Q: What does Mercedes-Benz error code P0174 mean?

P0174 means the engine management system detected a lean air-fuel mixture on bank 2 of your Mercedes engine. This indicates too much air or not enough fuel is entering the combustion chambers.

Q: Can I drive my Mercedes with P0174 code?

You can drive short distances with P0174, but avoid long trips or high-performance driving. A lean condition can cause engine damage over time, including burned valves and catalytic converter failure.

Q: How much does it cost to fix P0174 on Mercedes-Benz?

Repair costs range from $50-150 for simple fixes like vacuum hoses or MAF sensor cleaning, up to $800-1500 for fuel injector replacement or intake manifold repairs at a Mercedes dealership.

Q: What causes P0174 code in Mercedes vehicles?

Common causes include vacuum leaks in intake hoses, dirty or faulty mass airflow sensor, clogged fuel injectors, low fuel pressure, faulty PCV valve, or intake manifold gasket leaks.

Q: Will P0174 clear itself on Mercedes-Benz?

P0174 will not clear itself - the underlying problem must be fixed first. The code may temporarily disappear if the condition is intermittent, but it will return until the root cause is addressed.

Abstract

Mercedes-Benz error code P0174 indicates your engine is running too lean on bank 2, meaning there's too much air and not enough fuel in the air-fuel mixture. This can be caused by vacuum leaks, faulty fuel injectors, or problems with the mass airflow sensor.