txrhino

My check engine light stays on after driving maybe 10 minutes. I had it checked at repair shop, they said it is showing 172 lean bank 1. He told me it could be anything from clogged filter to sensors. The car is 100% stock, and seems to run perfect, I havent noticed anything different. I went ahead and changed the fuel filter, and cleaned the MAF with the spray cleaner you can buy. I reset the code but it came back. Is there a way to narrow down the problem, any suggestions?