How many oxygen sensors does a 99 Mazda millenia have and where are they located?
I have a 99 millenia myself and it has 4 (four) 02 sensors, and each go for around 200-450 in price. I don't really know where they are located though, but i do know they can cause your check engine light to come on and flash from time to time, as well as the car hesitating and feeling like it is going to stall.
On the 98 Mazda 626 there are two oxygen sensors, one is located at the front bottom of engine on the drivers side. If I remember correctly it requires a 23mm wrench to remove. The other sensor is located under the bottom on the exhaust pipe just behind the cat. converter. I hope this will lead you in the right direction and good luck.
I am getting ready to replace the EGR valve on my 1995 Mazda millenia. It is located at the back of the engine in the center at the top. It bolts on with 3 bolts. It will be a triangle shape. You will have to have a mirror to see it well. Any auto parts store should be able to show you exactly where it is.
Generally there are two oxygen sensors for each cylinder head on all later model vehicles (some early models may only have one). Each upstream oxygen sensor is located directly below the exhaust manifold flanges and above the upstream catalyctic converter. Each downstream oxygen sensor is located in the exhaust pipe, directly behind the upstream catalyst, and ahead of the main catalyst. NOTE: Some very early models may only have one catalyst. The electrical connector for…