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The upstream o/2 sensor is located in the exhaust system between the exhaust manifold and the catalytic converter. Some vehicles will have 2 upstream sensors (i.e. 1999 Chevy Astro 4.3l engine has sensor for left exhaust manifold and another for right exhaust manifold). I am trying to find out for sure if you have to replace both when one goes bad. Bosch says both must be replaced!!!???

Oh yeah it(they)are easy enough to replace if you can see it (them).

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โˆ™ 2011-09-13 11:19:00
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Q: Where is the upstream oxygen sensor located and can you replace it yourself?
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