PO131 PO171 codes help!
 

Hey im getting codes PO131 PO171 also random misfire codes..when its warm out I get no cel and car runs fine no misfire.. It says bank1 sensor butI wanna be sure.. my tl is California emissions I saw denso sensors on eBay for a good price.. would they work? Or do I have to go to dealer cuz its California emissions? Anyone can help? Thanks I appreciate it..

P0131>Primary O2 sensor reading low voltage could be a fuel supply problem. Check the fuel pressure. If ok, then check the sensor.

P0171>Fuel system too lean may be the fuel pump, filter, pressure regulator or EVAP purge control valve. If ok, then check misfire or sensor.

Thanks Bro i will surely check those out..