1997 vw jetta trek CEL code p0172

hii.. i have a 1997 vw jetta trek 2.0 manual 5 speed.... and i can't get rid of the check engine light it goes on and off by itself every other week.... the code is p0172 (bank 1 system running too rich ) i've alreay replaced the o2 sensor in front of the cat convertor and i replaced the MAF ( mass airflow sensor) i checked all the vacuum lines and none of them are cracked or leaking.... but i keep getting all kinds a oil in my air filter hose and i keep having to clean it like once a week.... is that because i have a K&n filter in it ???? or some1 told me my pcv valve might be cracked or broken.... any suggestions????? ne1 else have the same problem?????

Yes, of corse your K&N filter is the responsable for the oil.
I´m 90% sure the the K&N filter is the responsable for the mil code (p0172)...
Teke out that filter. clear codes,, and keep posted.

thanks that def was the problem as soon as i took out the k&N filter and put a regular 1 back in and cleaned the hose the CEL turned off within a couple of hours.. thanks for your help u saved me all kinds of money and time....

o.k that only fixed the problem for about 4-5 days, the CEL is back on with the same code and it's aggravating. NE BODY got ne ideas to why the light keeps comin back on to what the problem is??????????

cleanning it doesn't always eliminate the MAF as being faulty!

i replaced the maf already and the o2 sensor in front of the cat, and the lite keeps comin back on it stays off for about 3 days then come back on..............