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P0174 - System Too Lean Bank 2

Possible causes
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
Tech notes
If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.
When is the code detected?
- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
P0174 Description

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).

P0174 Information for specific makes
P0174 ACURA Fuel System Too Lean Bank 2
P0174 AUDI System Too Lean Bank 2  P0174 Video
P0174 BMW Mixture Control 2 System Too Lean Bank 2
P0174 BUICK Fuel Trim System Lean Bank 2
P0174 CADILLAC Fuel Trim System Lean Bank 2
P0174 CHEVROLET Fuel Trim System Lean Bank 2
P0174 CHRYSLER Fuel System 2/1 Lean
P0174 DODGE Fuel System 2/1 Lean
P0174 FORD Fuel Injection System Too Lean Bank 2  P0174 Video
P0174 GMC Fuel Trim System Lean Bank 2
P0174 HONDA Fuel System Too Lean Bank 2
P0174 HUMMER Fuel Trim System Lean Bank 2
P0174 HYUNDAI System Too Lean Bank 2
P0174 INFINITI Fuel Injection System Too Lean Bank 2
P0174 JAGUAR System Too Lean Bank 2
P0174 JEEP Fuel System 2/1 Lean
P0174 KIA Bank 2 System Too Lean
P0174 LAND-ROVER System Too Lean Bank 2
P0174 LEXUS Air/Fuel Mixture System Too Lean Bank 2
P0174 MAZDA Lean Air/Fuel Ratio Bank 2
P0174 MERCEDES-BENZ System Too Lean Bank 2
P0174 MITSUBISHI System Too Lean Cylinders 2-3
P0174 NISSAN Fuel Injection System Too Lean Bank 2
P0174 OLDSMOBILE Fuel Trim System Lean Bank 2
P0174 PONTIAC Fuel Trim System Lean Bank 2
P0174 SATURN Fuel Trim System Lean Bank 2
P0174 SCION Air/Fuel Mixture System Too Lean Bank 2
P0174 SUBARU System Too Lean Bank 2
P0174 TOYOTA Air/Fuel Mixture System Too Lean Bank 2
P0174 VOLKSWAGEN System Too Lean Bank 2  P0174 Video
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