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Old 03-01-2011, 10:55 AM   #2 (permalink)
Abdiel
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Extending O2 sensors basically reduces the chance of getting a check engine light (CEL) by moving the sensor further away from the exhaust stream (I think). More for test pipes than HFCs.

I think getting CEL on HFCs is fairly rare. I've got 10k mi on Berk HFCs without issue.

That being said, getting extenders probably doesn't hurt.
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