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Where are the two intake side O2 sensors of a 1999 Lexus ES300?


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2008-12-05 13:02:42
2008-12-05 13:02:42

Under the intake manifold.


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Underneath lower intake manifold in the valley between the heads.

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Underneath the lower intake manifold, in the valley between the cylinder heads.

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Your engine block is the main part of your engine that holds the crankshaft and pistons internally. Your knock sensors, there are two, are screwed into the top of the engine block in the valley between the cylinder heads. You don't have to remove the engine block, you do have to remove the upper and lower intake manifolds to get to them. I changed the sensors in my 99 rx300, long day!

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This is under the intake manifold and the one on the left. There are 2 of them, one on the left side (when looking from the front) is the Bank 2 sensor. Cost is about $170. It takes about 4 hours to replace it.

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