Dear friends, my 2002 RX300 got error code P0171 and P0136 last week. I changed MAF sensor from Autozone. No improvement. Yesterday, P0174 also showed up. I bought a cheap OBDII adapter from Ebay and then installed free software scantool_netwin113 in my laptop. Today, I got sensor data from scantool. The screen shot is attached here.
Anyone can help me interpret it?