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Oxygen Sensors (O2's), are one of the most important parts of an LSX Swap. They relay the Air Fuel Ratio back to the ECM so your engine runs optimally.

O2 Sensors are a wear item, just like a spark plug or serpentine belt. O2 Sensors that are high mileage, have been submerged in water, have been removed from a junkyard with a torch, or are in any other way damaged, should be replaced.

PSI Wiring Harnesses are Designed to use a Specific O2 Sensor, usually based on engine generation.

Genuine GM Delphi/Delco O2's are the preferred Sensor to use, and are carried by PSI.

Looking for an Affordable, In Stock, Plug and Play wiring harness for your LS Swap? PSI sells Standalone Wiring Harnesses for GM Gen II, III, IV, & V LS/LT based engines and transmissions. These harnesses include the Gen II LT1/LT4, Gen III (24x) LS1/LS6 and Vortec Truck Engines as well as Gen IV (58x) LS2, LS3, LS7, & Vortec and GEN V LT / ECOTEC3 Engines. All PSI Harnesses are Made in the USA. In addition to wiring harnesses, PSI carries Holley Products, Vintage Air A/C, Dakota Digital Gauges, HPTuners and PCM programming, Fuel Pump Kits, Engine Sensors, Extension Harnesses, Replacement GM connector pigtails and a complete line of hardware to complete your conversion needs!

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Oxygen Sensors

Oxygen sensor 4 wire flat gen 2

Oxygen sensor 4 wire square white/gray gen 3 (242, E40)

Oxygen sensor 4 wire triangular black gen 4 (E38, E67)

Oxygen sensor 4 wire square black gen 3 (411)

Oxygen sensor 4 wire flat gen 5 (E92)

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