I have a 1997 Ford Explorer with trouble codes P0430, P0171 & P00174. I have cleaned the MAF. Not sure where to go from here. Kevin. When I had the codes read at Advanced Auto parts they said it was an O2 sensor and dirty MAF. Don't want to do a shotgun fix and start replacing things that are working, nor do I want to spend a lot of time.
If you can find away to check the freeze frame data let me know if the lean codes were set @ hi way speed or idle. We will need to check the o2 sensors to see if thay are reading correct. We will need to create a large vacuum leak and see if the fuel trims go to positive and then add fuel and see if thay go negative. Let me know if you need help with this. You will need a scanner to do the testing