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Re: o2 sensor location
What engine do you have? Does your car have a V6 or a four-cylinder? Regardless of the engine, you will have an O2 sensor after the catalytic converter. On a four cylinder you'll have one in the exhaust manifold as well. On a V6 you'll have one sensor between the engine and cat, and one after each cat as well. The sensor(s) before the cats determine your fuel mixture, and the after-cat sensor(s) are used to monitor the efficiency of the cat.
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The Mass Airflow sensor measures the amount of air entering the engine. For EVERY vehicle that is equipped with an Mass Airflow sensor, it is located in the same place...in the air intake between the air cleaner and the throttle body.
Hi Steve ..it refers to the location of the oxygen (o2) sensors relative to the engine. The upstream sensor is the one closest to the engine. The downstream sensor is furthest from the engine. Think of it as the way a stream of water, or in this case, a stream of exhaust flows.... From the engine To the tailpipe. Changing them is no problem, getting to them sometimes can be a bear,, if you can reach them,, its simply remove the old one with a couple of bolts, and unplug it,, and replace
O2 sensor won't cause a no spark no start condition but the crank sensor will. most time bad crank sensor will not set a code if engine doesn't start. usually set code on o drop while driving. I would check connection at sensor if good then replace sensor.
What is wrong with the O2 Sensor?
How was it tested?
Why are you mentioning the EGR, and what do you mean by what kind. It either fits your vehicle or it doesn't.
What are the vehicles problems,before you throw parts at it?
There are two O2 sensors. One is for the computer to control the Air/Fuel ratio mixture and one is for the catalytic converter. The one for the catalytic converter tells the computer nothing more than if the cat. con. is working properly.
The major O2 sensor you are probably looking for is on the exhaust manifold just below where all 4 cylinders meet into one pipe. It has a wire going to it and it sticks out of the exhaust a good ways, it's hard to miss.