Fuel Efficiency Unleashed The Importance of Changing O2 Sensors

Use a ratchet wrench and an oxygen sensor socket to unscrew it. You can also use an open-end wrench to unscrew the sensors. I've been googling around but can't seem to find any information on replacing the o2 sensors beyond the diagrams offered by Volvo: 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. Try disconnecting the battery. Wait 10 minutes, and connect it again. That should restart the computer. If the CEL is still on, then you just wasted your money! The engine computer is only reading from the sensor with the engine running so generally speaking you do not need to disconnect the battery when replacing it. you don't have to but it is a good idea. it lets the pcm start fresh and not have to relearn itself. don't forget that fuel milage will drop ... The primary o2 sensor is used to monitor air/fuel ratio and the ECU adjust to have the engine runs optimally. The secondary o2 sensor is there to just monitor ... Outstanding!!! Worked for you, right? :D. ~Rick < ... You'll need a special O2 Sensor wrench to the remove it. That's not hard. The hard part is detaching & reattaching the electrical connector. It's in a tight ... Changing an oxygen sensor is a beginner DIY job. Once you get started, the work itself should take 30 to 60 minutes if your sensors are easy to reach and ...