Hi all,

Recently, we have had a thread going on replacement of O2 sensors. This is a hot topic during these times of increased fuel prices and understanding complicated engine management systems. The O2 sensor is an essential part of the engine control and can fail without having any fault codes come to our attention.

It will become increasinlly important that we know how to test & diagnois a faulty sensor and then replace with the correct part. This may sound easy but as this attached thread points out there are different types of sensors now available and the parts code listed can be wrong. It was also discovered that certain after market brands perform better than others so this is another trap for those uninformed. Going OEM is not always the best option as it can cost over $1200US to replace sensors which may still be functioning.,

http://www.mitsubishi-forums.com/t38645-an...gen-sensors.htm

I know that this attached thread link is long and difficult to follow. It is my intension in pinning this new thread to develop a good comphrensive place to document test methods, available replacements and problems we have encountered with the sensors. If you have some information which would be of use to all of us in this thread please post it up.

I will attach a link below that describes how sensors work and basic test procedures for a start. Do note that this article is a little out-dated and technology has advanced. Just one of the recent pitfalls I discovered.

http://auto.howstuffworks.com/framed.htm?p...G/o2sensor.html


Jim

Hi, I'm trying to locate a front oxygen sensor for a 1.8GDI 2000/01 pajero IO, Chasis:H76W, Engine:4G93. My vehicle is rough idling: revs falling to almost zero and then rising up to about 800rpm causing the engine to tremble and the mechanic thinks the prob is a faulty O2 sensor. Other probs include hard starting and a violent surge when i put the vehicle in drive. U can email me at asap13@hotmail.com

Thanks for any help, i'm getting desperate lol