Ok, you have spent quite allot of money and you still have the problem. Your mistake is in believing that the code set tells you what part to replace. That is not always true. The code tells you what part or system is being effected. This is why it takes a trained technician to diagnose this kind of problem. You can keep throwing parts at the problem and maybe you will get lucky or you can take it to a professional for repair. I could guess at what is causing this like that O2 sensor you did not change, but that is what you are doing and that has not worked has it?
P0174 - Fuel Injection System Too Lean Bank 2
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
Possible causes
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection
Possible solution
Dirty air filter of faulty air flow sensor are common causes of the problem.
Bottom line possible defective Mass airflow sensor and or O2 sensor in cylinder bank number two.
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