My 2003 Land Rover Disco 2 has isuues
PO171 system to lean Bank 1
PO130 02 sensor circuit Bank 1 sensor 1
P1171 Oxygen sensor system too lean fault banks A & B

What is the first step thank you in advance
Ernie

 

P1171 is actually for just bank 1. You have a bad O2 sensor, drivers side front. I would replace both the front and rear drivers side sensors if you can afford it.

 

Thanks lipadj46 i have recently replaced a stuck open egr on that side with a stuck closed
one that I bought off of ebay. Stuck closed being a little more desireable because I was tired of burning up sai pumps found a free 2001 Disco 2 and grabbed a lot of extra parts but this is the wifes car so I might get all four sensors new as well as a new egr valve for the drivers side.
Question...do you think a stuck egr can mess up an o2 sensor?
Thanks for the help
Ernie

 

I dont know what you are calling a EGR valve on your truck but there is NO EGR ON A DISCO ENGINE.