HKS O2 Sensor Boss + Bolt 5pcs set

Marsoni

M251S

$160.02

Get it in 3 business days with 1 day shipping. Friday, May 29

HKS O2 Sensor Boss + Bolt 5pcs setHKS O2 Sensor Boss + Bolt 5pcs set

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This filter looked about the same as the OEM filter. It installed in about a minute. The quality appeared to be fine. It was protected in a cardboard box. It fit my 2014 Subaru Outback perfectly. I just installed it an hour ago so I don’t have any long term observations about longevity or effectiveness. I can’t see any reason why it would not work as well as the original, it seemed identical.

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Reviewed in the United States on May 29, 2026