Vacuum leak on bank 2 side. Faulty bank 2 O2 sensor. Intake manifold gasket leak. Fuel delivery issue. PCV system fault.

Which cars are affected by P0174?

P0174 is most commonly reported on Ford, BMW, Mercedes-Benz, Jaguar, Land Rover vehicles, but can appear on any make.

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P0174

Medium severity

System Too Lean (Bank 2)

Similar to P0171 but on bank 2. The engine is running lean on the second bank of cylinders, typically found on V6 and V8 engines.

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Common causes of P0174

1Vacuum leak on bank 2 side

2Faulty bank 2 O2 sensor

3Intake manifold gasket leak

+2 more causes

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Commonly affected vehicles

FordBMWMercedes-BenzJaguarLand Rover

P0174 can appear on any vehicle — these are the makes where it is most frequently reported.

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Related fault codes

P0171Medium

System Too Lean (Bank 1)

P0300High

Random/Multiple Cylinder Misfire Detected

P0420Medium

Catalyst System Efficiency Below Threshold (Bank 1)

P0172Medium

System Too Rich (Bank 1)