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This thing is not as fun as I hoped to access. It’s not hard but I’d like to do this every 15,000 miles and it’s annoying and worry about compromising the connector. The foam on top doesn’t seem to be removable without tearing it
Servicing the sensor is a good opportunity to throw a foam removal party and do that at the same time. Removing the foam was quite satisfying, making me feel warm and fuzzy inside. The foamectomy made no notable difference in sound while driving, as the engine is really pretty quiet while operating at normal speeds. It does sound quite a bit more clattery at idle without the foam.
There is a lotta foam. If I recall right, there is an upper layer that easily lifts off, and a lower nooks and crannies layer that requires a bit more determination. A long needle nose pliers is quite useful for getting the lower foam out.
I like the extra clatter at low speed, as it helps to confuse the 6.7 diesel truck owner on the other side of the pump when I pull into the gas station.