Quote Originally Posted by webmiester View Post
I was told that mine doesnt have one. O2 sensors became standard for Lancers in year 2000, before that, they didnt come with any although the engine and fuel injection system is the same. I dont know if the box is the same, however, I did install a new computerized LPG system which can make use of the information when it is on LPG mode. KayaThanks so much. even if my old box cant use it, my new one can.

If it can be installed anywhere in the exhaust manifold (because my car doesnt have a catalytic converter), then I can just get drill a hole anywhere there and install it there right?
it doesnt matter if your engine is a carborated or mpfi system, as long as it has cat then it should have 02 sensor.correction, not anywhere in the exhaust manifold but anywhere in the exhaust system.anyway some cars has 1 o2 sensor, sometimes they have 2 but most cars today has 3 in a single pipe exhaust system or maybe more depending on an exhaust design.this 3 sensor have different function in one system.1st sensor monitors how raw the fuel mixture coming out from the chamber before it goes to pre-cat,for start up only and sometimes it also help for early activation of egr.2nd sensor monitors either rich or lean air fuel mixture after pre-cat and before cat.3rd sensor monitors the efficiency of the cat converter.if you vehicle is equipped with cat and 1 o2 sensor,it is consider as the 2nd sensor but if your vehicle is not equipped with cat,why try to put one.its nonesense.no offense but its true.its there for emission purposes.