I replaced the O2 sensor on the exhaust manifold. It ran fine and I cleared the previous codes before changing. Ran good for two days and then the engine light came back on. Same codes I am pretty sure. I havent checked them yet.

Anyone have any other ideas what else might be causing this?

 

P0171......... could be a bad EVAP PURGE CONTROL SOLENOID VALVE... I would take car to honda shop and have them properly diagnose the code and the cause,, it might be cheaper than to replace unneeded parts ..