This is a brand new aftermarket oxygen sensor, built as a direct replacement for the original unit fitted to the Indian Chief Classic, Chief Dark Horse and Scout and to the Polaris General, Ranger and Sportsman from 2014 to 2026. It is plug-and-play and a direct fit, and every unit shipped is tested before it leaves the warehouse.
The oxygen sensor sits in the exhaust and reports back to the ECU how much unburnt oxygen is left in the gas stream. That reading is what lets the engine management system trim the fuel mixture continuously and hold it where it should be. Sensors age from heat cycling, soot and contamination, and a tired one reports lazily or stops switching altogether. The symptoms are familiar: poor fuel economy, rough or hunting idle, hesitation and surging at steady throttle, a smell of rich running, and a check-engine light with an oxygen sensor or fuel trim fault stored. This sensor measures 47 mm long, 14 mm wide and 14 mm high, with a single four-terminal plug that matches the original loom connector. Part number RMS140-106694, replacing 4013979 and 4016021.
Key Features
- Brand new aftermarket oxygen sensor
- Direct replacement to your original unit
- Plug-and-play, direct fit, easy installation
- Single plug with four terminals, matching the original connector
- Compact 47 mm x 14 mm x 14 mm body
- Every unit is tested before shipment
- Covers both the Indian and the Polaris applications
Technical Specs
| Specification |
Detail |
| Part Number |
RMS140-106694 |
| Width |
14 mm |
| Length |
47 mm |
| Height |
14 mm |
| Number of Plugs |
1 |
| Number of Terminals |
4 |
| Condition |
Brand new, tested before shipment |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model |
Years |
| Indian Chief Classic |
2014-2026 |
| Indian Chief Dark Horse |
2014-2026 |
| Indian Scout |
2014-2026 |
| Polaris General |
2014-2026 |
| Polaris Ranger |
2014-2026 |
| Polaris Sportsman |
2014-2026 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 4013979 |
Indian / Polaris |
| 4016021 |
Indian / Polaris |
Frequently Asked Questions
Will it fit without modification?
Yes. It is a plug-and-play, direct fit replacement for the original sensor. The single four-terminal plug matches the original loom connector, so nothing needs cutting, splicing or adapting.
What is included?
The oxygen sensor with its integral lead and plug. Re-use the original sealing washer if your application has one.
How do I know the old oxygen sensor has failed?
Fuel economy dropping away for no obvious reason is the classic sign, together with a rough or hunting idle, hesitation and surging at a steady throttle, a rich exhaust smell, and a check-engine light with an oxygen sensor or fuel trim fault stored. Check the plug and the lead for heat damage and corrosion first, because a damaged connector gives the same readings as a dead sensor.
Is the same sensor used on both the Indian motorcycles and the Polaris machines?
Yes. This sensor covers the listed Indian Chief Classic, Chief Dark Horse and Scout models as well as the Polaris General, Ranger and Sportsman. If you are unsure, match the number on your original unit against the cross reference table above.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
