So my disco was throwing the code P0150, O2 Circuit (Bank 2, Sensor 1), and saying that it was running to lean. From what i understand that means that the O2 sensor in front of the cat on the drivers side was bad. Or did i read the code wrong and it is a different O2? I do not really have the money ATM to replace all 4 of the O2s even though i know that it is about the mileage at which i should. Just not an option right now. Well i just replaced it with a new one from AB that was the Bosch brand. I cleared the code and about 15 miles into driving it the code came back on. Does this mean that i could have gotten a bad sensor from AB, or could it be something else? Could the post cat O2 be bad and some how be throwing the pre cat one off? Also could it be a bad MAF? I have just a cheap scan tool that does not tell me the output from the O2, but if i took it to a Land Rover shop would they be able to tell me? Thank you for any help you can give me on this.

 

Bank 2 Sensor 1 is passenger side front, doh!

 

Also along with the last post, a 0150 is not a lean code for that 02 but a 02 malfunction code, it is dead. So all that being said replace the drivers side 02 and install the new on on the passenger front.

 

Ditto. Bank 2 is the side of the engine that hosts cyl 2 (pass side) I have the same code currently active on my disco. Just do t have the money for the sensor yet.

 

The money you are blowing on gas running rich you could have bought an O2 sensor. That is if you have been driving the truck.

 

Make sure all your sensors are tight. I had one that was finger tight. I replaced all four sensors, but it was probably that loose one causing all the problems. autopartswarehouse.com sells Bosch, I bought all 4 for $238.

Willie