Oxygen Sensors
About Oxygen Sensors
An oxygen sensor reads how much unburned oxygen is in the exhaust and reports it to the engine computer, which uses it to adjust the fuel mixture. When one fails or gets contaminated, a bike can run rough, burn more fuel than normal or set a check-engine light. Riders replace sensors when a fault code points to one, and they swap or move them when changing the exhaust.
Because sensors are model-specific, the details on the listing matter. Match the thread size, the position on the bike, front or rear, the connector, the wire length and any manufacturer part number to the sensor you are replacing, and use the Ride Finder to narrow the list. If a new exhaust has a different port size, an adapter can let the sensor fit. Keep oil, grease and silicone off the sensor tip during installation, and route the wire away from hot parts.
Brands in this category include Drag Specialties, Cycle Pro LLC and Feuling Parts. If you are fitting a new pipe, see Manifolds & Headers and Other Exhaust & Emission System Parts. All are part of Exhaust & Emission Systems.
FAQs on motorcycle oxygen sensors
How do I know if my oxygen sensor is bad?
Common signs are a check-engine light with an oxygen sensor code, rough running and worse fuel economy. Have the code read before replacing anything, because wiring faults and exhaust leaks can cause similar symptoms.
Which oxygen sensor fits my motorcycle?
Pick your bike in the Ride Finder at the top of the page, then confirm the sensor position, thread size, connector and wire length on the listing. Many bikes use a different sensor for the front and rear cylinder.
What does an O2 sensor adapter do?
An adapter lets a sensor with one thread size fit a port with another, from one size to another. Make sure the sensor still sits in the exhaust flow where the maker intended, and that the wire reaches without strain.
Do I need to move my oxygen sensor when I change the exhaust?
If your bike has a sensor, it normally has to go into the new pipe's port. Check that the new pipe has a matching port, or whether you need a bung or an adapter. The fuel system depends on that reading.
How do I install an oxygen sensor?
Let the exhaust cool, unplug the connector and unscrew the old sensor. Thread the new one in by hand, tighten it to the value in your service manual and plug it in. Route the wire away from hot or moving parts.
