the service engine light came on a month after I did an oil change. So I went to autozone and rented the code reader it says P0127 running rich on bank 1... what causes this and do I need to take it to the stealership to get it service? thanks in advance. I searched the forum but couldn't find any answer.

 

dirty injector, dirty MAF, fuel pressure, vacum leak... Clean the first two and check the last two. Clear the code and see if it comes back on

 

Might check the 02 sensor itself.