So I stopped by local Autozone today and had them check the system for codes. Got a strange message: "No DTC definition found, see service manual". Now when the salesman looked it up on the computer they came back with this code: "P1412". I'm not sure if this code appeared on the device or it is just the error code for the device itself not being able to find a definition.

With that said the seller told me the truck needs 02 Sensors, she did not specify front or rear. What do you guys think? I'm planning on replacing at least 2 of the sensors very soon (either both front or both rear) but I wish I knew which ones actually needed to be replaced. I dont want to pay more $$$ to fix something that isnt broken.

Off topic: Ive seen alot of people on here complaining about issues with Bosch 02 sensors.... but I know that alot of you stand behind Bosch sensors. Guess I'm wondering if Bosch really is good or not as far as 02 sensors are concerned. I also wonder why Atlantic British does NOT sell Bosch? They stand behind the aftermarket 02 sensors available on their site (genuine and the aftermarket sensors). Has anyone had good luck with the aftermarket 02 sensors found on Atlantic British?

Land Rover Oxygen Sensor Replacement (Same Fit As Genuine Part # MHK100920) - Land Rover Oxygen Sensors
Land Rover Discovery II Oxygen Sensor (Same Fit As Genuine Part # MHK100930)

 

From rave manual: p1412 Secondary Air Injection System - Malfunction Bank 1 LH (Insufficient SAI flow during passive test)

 

So for the less mechanical inclined, what part/s am I looking at replacing? Is this a symptom of worn out 02 Sensors or something else?

 

There's probably just a buggerd up hose or connector on your SAI. Hit the google with the code or search the forum and see if anyone else had the issue. Its only 1 code so it may not be the entire unit and a quick fix.