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It looks like i have some kind of issue with my car, exhaust smells funny, emission tests are not the greatest, consumption went high about 2l/100km with same driving style and when the car sits and idles for more then 10 minutes i will get the ECU error code p0171, which by the internets reads as follows:

P0171 HONDA Fuel Injection System Too Lean Bank 1

Some people suggested this may be due the intake mod i have (KN panel filter + polished airbox) but i got this error once even before i done this mod so i would not blame it on it, is it possible that this could be caused by O2 sensor as described on the link? Anyone had this issue?

Also from what i understand the O2 sensors are made by Denso but if bought as OEM from Honda they are expensive, what is the correct Denso P/N for the O2 sensor/s?
 

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If you have had this reading before any mods then I would check the lambda sensor in you exhaust as it may be getting the lean reading from there aswel as maybe the MAF
 
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