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Big/Small block MerCruiser O2 sensors


Big/Small block MerCruiser O2 sensors

Old 03-09-2023, 10:26 AM
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Default Big/Small block MerCruiser O2 sensors

If you have a big block or small block mercruiser engine that has oxygen sensors pt# 8M2003959 and they go bad. You will be paying around $125 each.
On the other hand. You can buy the exact same oxygen sensor from GM pt# 12640453

on eBay all day for $48. I found a dealer that sold them to me for $35 each.

Last edited by AmiableDave; 03-09-2023 at 10:28 AM.
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Old 03-09-2023, 10:35 AM
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Great info, thanks.
Quick check, RockAuto and Amazon (not 3rd party) sell for $35-38 also.
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