Transforming Engine Health The Ultimate Guide to Changing O2 Sensors

LR4 - Replacing Front O2 Sensors on LR4 for both banks - I am working on replacing my O2 sensors and I was able to get the rear sensors but ... The truck didn't want to start. Then once started it dies when my foot's not on the gas. So if I'm stopping, turning, etc... the truck stalls. Double check those vac lines, or get me a pic of which ones they were. It culd be that your ECu is re-learning fuel trims after having tehm way ... I did a lot of searching and didn't find any real tips for replacing the pre-cat sensors. So I thought I'd pass along a few of my own tips. Rust/corrosion will be the difference between a 5 minute and 5 hour job. If it appears frozen don't force it and instead douse the threads in ... They can be a huge pita if they are really stuck. The o2 sockets are great for installing them but not always so great for getting them out. This socket is absolutely essential for removal and replacement Pre-cat sensors (sprayed with release oil an hour before) Removing is easy with the right tools. Simply unplug the sensor when it has failed or reached its 100K mile service life and then remove it by placing a proper socket or closed end 22mm wrench on it. The O2 sensors will typically start to fail between 100k to 150k miles, and the only real solution is to install a new one. This is really the easiest way to gain access to the upstream O2 sensor. Removing the wiper tray provides the clearance and headroom to get at, and tools on, ...