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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 the right downstream oxygen sensor is located on the right side of the transmission. - Mazda Pickups Repair Manual == Try Removing the front tires behind plastic shielding to get to the sensors on the upstream O2 sensors and there should be another downstream "easier".

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Q: What is the location of the oxygen sensor Bank 2 Sensor 1 for a 1998 Mazda B4000?
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Where is the oxygen sensor 1994 Mazda b4000?

Under hood, driver side, rear engine area, above exhaust pipe flange, mounted in exhaust manifold.


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Egr valve does not cause stalling. it does not open at idle. I would look at oxygen sensor, then check the gas for water. The EGR can be cleaned, but my EGR valve is 10 years old and did not need cleaning. Also look at plugs and wires.


Why does Mazda engine warning light show when there are no faults?

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