Oxygen Sensors

Oxygen Sensors: the feedback loop that keeps your fuel trim honest

Oxygen sensors sit in the exhaust stream and tell the ECU how much unburned oxygen is left after combustion, so the computer can trim fueling toward the target ratio. A tired or lazy sensor throws the mixture off, kills fuel economy, sets codes and can leave you chasing a rough idle that isn't the engine's fault. Whether you're replacing a worn factory unit or adding a wideband bung for tuning, this category covers both jobs. We stock 19 oxygen sensors and related hardware in the Engine Components section.

What ThreePiece stocks

The range runs from $71 to $913, which is the current spread for what's in stock, not a fixed price. Across the 19 products there are five brands: NGK makes up the bulk with 13 units, followed by Vibrant with three, and one each from Bosch, Innovate Motorsports and FAST. That covers direct-fit replacement sensors, bare wideband elements, and weld bungs to mount them.

Direct-fit examples include the NGK Mazda 3 5-wire wideband A/F sensor and the NGK Acura MDX 5-wire wideband sensor. For standalone tuning setups, the Bosch LSU 4.9 sensor and the Innovate Bosch LSU 4.2 sensor are the common wideband elements. To mount one in custom exhaust, the Vibrant T304 stainless M18 weld bungs and the 30-degree angled weld bung ship in bulk packs.

How to choose

The first question is direct-fit versus bare element. A direct-fit sensor plugs into your factory harness with the right connector and wire count, so it drops in with hand tools. A bare wideband element like the Bosch or Innovate units is for gauge and standalone tuning, and needs a bung welded into the pipe plus the matching controller. Twelve of these products carry vehicle fitment data. If you're on custom exhaust, budget for the weld bungs; the angled bung helps keep the sensor tip out of pooled condensation on tight bends.

Vehicle coverage

Fitment data covers makes including Ford, Dodge, Cadillac, Mazda, Nissan, Chrysler, Acura and Jeep, with specific vehicles such as the Ford Aerostar, Dodge Ram 2500, Cadillac Escalade, Mazda 3, Nissan Altima, Chrysler 200, Acura RSX, Acura MDX and Jeep TJ, spanning model years 1986 through 2017. Always confirm your exact year and engine before ordering.

What else you may need

Sensor work often pairs with other engine service. Browse Fittings and Adapters if you're plumbing a wideband into custom exhaust, and check Fuel Pumps and Gasket Kits if you're deeper into a fueling or top-end job. Filters and cooling parts like Oil Filters round out routine maintenance.

Fitment help and ordering

Every order ships with free shipping, and Affirm and Katapult financing is available. Not sure which sensor matches your connector and wire count? Call our fitment line at 813-535-5801 or reach us through contact us before you buy.

Oxygen Sensors: the feedback loop that keeps your fuel trim honest

Oxygen sensors sit in the exhaust stream and tell the ECU how much unburned oxygen is left after combustion, so the computer can trim fueling toward the target ratio. A tired or lazy sensor throws the mixture off, kills fuel economy, sets codes and can leave you chasing a rough idle that isn't the engine's fault. Whether you're replacing a worn factory unit or adding a wideband bung for tuning, this category covers both jobs. We stock 19 oxygen sensors and related hardware in the Engine Components section.

What ThreePiece stocks

The range runs from $71 to $913, which is the current spread for what's in stock, not a fixed price. Across the 19 products there are five brands: NGK makes up the bulk with 13 units, followed by Vibrant with three, and one each from Bosch, Innovate Motorsports and FAST. That covers direct-fit replacement sensors, bare wideband elements, and weld bungs to mount them.

Direct-fit examples include the NGK Mazda 3 5-wire wideband A/F sensor and the NGK Acura MDX 5-wire wideband sensor. For standalone tuning setups, the Bosch LSU 4.9 sensor and the Innovate Bosch LSU 4.2 sensor are the common wideband elements. To mount one in custom exhaust, the Vibrant T304 stainless M18 weld bungs and the 30-degree angled weld bung ship in bulk packs.

How to choose

The first question is direct-fit versus bare element. A direct-fit sensor plugs into your factory harness with the right connector and wire count, so it drops in with hand tools. A bare wideband element like the Bosch or Innovate units is for gauge and standalone tuning, and needs a bung welded into the pipe plus the matching controller. Twelve of these products carry vehicle fitment data. If you're on custom exhaust, budget for the weld bungs; the angled bung helps keep the sensor tip out of pooled condensation on tight bends.

Vehicle coverage

Fitment data covers makes including Ford, Dodge, Cadillac, Mazda, Nissan, Chrysler, Acura and Jeep, with specific vehicles such as the Ford Aerostar, Dodge Ram 2500, Cadillac Escalade, Mazda 3, Nissan Altima, Chrysler 200, Acura RSX, Acura MDX and Jeep TJ, spanning model years 1986 through 2017. Always confirm your exact year and engine before ordering.

What else you may need

Sensor work often pairs with other engine service. Browse Fittings and Adapters if you're plumbing a wideband into custom exhaust, and check Fuel Pumps and Gasket Kits if you're deeper into a fueling or top-end job. Filters and cooling parts like Oil Filters round out routine maintenance.

Fitment help and ordering

Every order ships with free shipping, and Affirm and Katapult financing is available. Not sure which sensor matches your connector and wire count? Call our fitment line at 813-535-5801 or reach us through contact us before you buy.