Help Engine Check Light

Am getting a code reading of PO171 -system too lean Bank 1, P0174 -system to lean Bank 2 and P0420 -Catalyst system efficiency below threshold bank 1. My 2006 V6 4.0L Tacoma has 235,000 miles on it. does it sound like i have to replace my manifold? or can it be something else i have a smog check coming soon.

 

P0171, P0174 problem areas:
• Air induction system
• Injector blockage
• Mass Air Flow (MAF) meter
• Engine Coolant Temperature (ECT) sensor
• Fuel pressure
• Gas leakage from exhaust system
• Open or short in A/F sensor (bank 1, 2 sensor 1) circuit
• A/F sensor (bank 1, 2 sensor 1)
• A/F sensor heater (bank 1, 2 sensor 1)
• A/F sensor heater relay
• A/F sensor heater and A/F sensor heater relay circuits
• PCV valve and hose
• PCV hose connections
• ECM

P0420 problem areas:
• Gas leakage from exhaust system
• A/F sensor (bank 1 sensor 1)
• HO2 sensor (bank 1 sensor 2)
• Exhaust manifold (TWC)

I would first make sure the MAF is working and that I had no vacuum leaks, PCV System is good and the exhaust system is not leaking. These are all common areas for this issue.

 

Thanks i will look into that