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I replaced mine 20k miles ago when I bought the car. I was concerned and checked today not having heard that the 911sc required 5k resistance. Checked, my new one is 1.2k Ohm, and the one I took off with date code 1988 is 1.2k Ohm. Also, when measuring, the carbon buildup on the air side was far beyond 20k Ohm, probably in the 100k range, so what is 4k relative to that?
If I've not understood something, please help me out.
Phil
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