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Passenger side upstream O2 sensor

CrackedHorn

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09 Mustang GT/CS; 15 Mustang GT
Is this O2 sensor supposed to have a bung threaded into the manifold on a 2015 GT from the factory?

This is the only 1 of my 4 O2 sensors set up this way, where there is a hex head bung in the manifold rather than just a smooth bung.

Hard to see in the Pic but the O2 sensor is red and the manifold hex bung is yellow.

Other locations with smooth bung shown for comparison

20240427_204832~2.jpg


20240427_205113~2.jpg
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Rojito_95

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Dylan
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'22 GT PP1/MT82, 95 F-150 XL "custom"
Not sure why it's like that.
Perhaps there's a non-fouler in there? (its basically a spacer that lifts the O2 sensor out of the exhaust stream to make it read better and not set a CEL)
 
 




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