Back to the house I started with the code that said I needed a new thermostat replace thermostat but this code 171-00 has come up afterwards.... lean bank 1 what's the best way to remedy this code darn it I'm taking a trip and this has to happen I hope I can get some help right away 2006 lr3

 

I was getting that code and found a loose clamp on the air duct by the MAF. Tightened it up and have been good ever since.