A-Premium Downstream O2 Oxygen Sensor for Mini Cooper 1.6L — 4‑Wire Heated OEM Fit

The A-Premium downstream heated O2 oxygen sensor is a direct-fit replacement for many Mini Cooper 1.6L models, delivering factory-style fitment and a 4-wire heated design for accurate exhaust monitoring.

This replacement oxygen sensor is built to match original equipment dimensions and connectors so you can swap it into the downstream (post-cat) location of compatible Mini vehicles without splicing or adapter harnesses. It uses a 4-wire heated sensor element to reach operating temperature faster and provide reliable voltage readings to the engine control module (ECM). The part references include 250-24546, 234-4488 and 11787548961 for easy cross-checking against service parts lists.

Which Mini models and years does this sensor fit?

This sensor covers a range of Mini Cooper 1.6L engines across several model years, including Cooper, Countryman and Paceman variants. Fitment spans naturally aspirated and turbocharged N12/N14/N16/N18 engine codes listed by the manufacturer. Always verify your vehicle’s part number or compare plug and threads before ordering to ensure compatibility.

• Compatible with 2007–2010 Cooper L4 1.6L (N14B16A/N12B16A)
• Fits 2009–2016 Cooper and Countryman variants with N14/N16/N18 engines
• Also listed for 2013–2015 Cooper Paceman L4 1.6L models
• Cross-references: 250-24546, 234-4488, 11787548961

How does the 4-wire heated design benefit performance?

The four-wire layout separates two heater leads from the signal and ground, allowing the sensor to warm up quickly and maintain correct operating temperature. Faster heating reduces the time the ECM runs in open-loop mode, helping fuel trims normalize sooner. The heated element also helps produce stable oxygen voltage under a wider range of exhaust temperatures.

• Two wires for heater power and ground for rapid warm-up
• Signal and reference ground wires for accurate voltage output
• Threaded mounting matches OEM spec for straightforward installation
• Heated design reduces cold-start inaccuracies

What are the physical and electrical specifications?

The sensor ships as a single unit in a protective box and uses a male connector compatible with factory wiring. Its threaded mounting and heated ceramic sensing element follow typical OEM construction to ensure a secure, leak-free fit in the exhaust flange or bung. The package includes one oxygen sensor and no additional accessories.

• Wire quantity: 4 (heated sensor)
• Sensor type: heated zirconia-style oxygen sensor
• Mounting type: threaded (OEM thread pitch and length expected)
• Connector gender: male; package quantity: 1 sensor in a box

Will replacing the downstream O2 sensor fix a check engine light?

Replacing a faulty downstream oxygen sensor can clear codes related to sensor circuit faults or poor catalyst performance readings, but it won’t address unrelated issues. Always scan for diagnostic trouble codes to confirm the sensor is the root cause before replacing parts. After installation, clear codes and monitor live data to verify correct operation.

• Useful for codes tied to downstream oxygen sensor circuits
• Not a substitute for repairs to wiring, connectors, or exhaust leaks
• Recommended to verify with a diagnostic scan tool before replacement
• Reset codes and check live fuel trim and O2 voltages after install

Who is this for: This A-Premium downstream oxygen sensor is intended for DIY mechanics and professional technicians working on compatible Mini Cooper 1.6L vehicles who need a direct-fit, heated 4-wire replacement. It’s suitable when the OEM sensor has failed, thrown related diagnostic codes, or when restoring proper downstream exhaust sensing after catalytic converter service. Confirm fitment against your vehicle’s engine code and part references prior to purchase.