LS Gen 3/4 - O2 Sensor Wire Adapter - Black/Trapezoid

LS Gen 3/4 - O2 Sensor Wire Adapter - Black/Trapezoid

Marsoni

M251S

$32.95

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

LS Gen 3/4 - O2 Sensor Wire Adapter - Black/TrapezoidGen 3 Black (1 Keyway) Harness to Gen 4 Trapezoid O2 Sensor Adapter Generation Spanning Adapter for Gen 3 to Gen 4 O2 Sensors Adapts Gen 3 LS oxygen sensor harnesses (black 1 keyway) to work with Gen 4 trapezoid style oxygen sensors. A must have when mixing LS generations in your wiring setup. Converts Gen 3 black harness to Gen 4 trapezoid style O2 sensor Maintains factory grade electrical connection integrity No cutting or splicing required

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I like that the install is very easy, non-permanent, and can be very quickly removed if needed. It fast charges and the magnets are strong (the reviews that say it doesn’t hold probably aren’t using a MagSafe case). That said I have two annoying issues: 1) There is a light that comes on when the car is turned on. If you don’t put your phone on the charger it will say on for a minute or two and then eventually turn off. 2) The included USB-C cable is too short. It only just barely reaches the outlet in the front bottom center console. It would be better if they had included a 6ft with a 90-deg connector to draw power from the back seat ports. 3) It doesn’t not include a charger. In all, the mount and charger are fine, but be prepared to spend an extra $20 on a longer cable and charger to make it all work.

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Reviewed in the United States on November 4, 2025

Verified Purchase

Lance Johnson

Carnegie, US

★★★★★ 5

Great Mag case phone holder

Works great holding my phone in front of me while I drive.

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Reviewed in the United States on April 3, 2026