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aRacer AF2 Wideband AFR Module 2

SKU: 300010506


aRacer's upgrade AF2 Wideband O2 AFR Module packs a lot of upgrades over their previous version, including a Bosch LSU 4.9 wideband O2 Sensor for more stable, accurate, and faster readings. They also improved the connection to their ECUs by providing a harness that plugs directly into their ECU without the need for extra converters or adapters, so the install is faster and easier and you can get back to riding


  • Reliable, precise, and high-speed AFR readings
  • No calibration needed - simply plug and play
  • BOSCH LSU 4.9 wideband oxygen sensor
  • Installs on 18mm O2 sensor bung
  • Enables "Closed Loop Fuel Compensation" with RC / RCMINI Plus ECU
  • Minimum operating voltage lowered to 8.5V


aRacer improved upon every aspect of their outgoing AFR module with the introduction of the AF2. This smaller module provides more accurate and precise AFR readings with a much faster response and warm up time. The included Bosch LSU 4.9 wideband oxygen sensor improves upon the performance while the upgraded wiring improves installation with a simple plug and play connection to aRacer ECUs.

When comparing the AF2 to the AF1, the difference is clear:

  • 38% reduction in volume
  • 53% reduction in weight
  • 37.5% improved response
  • 80% improved measurement accuracy
  • 25% reduction in heading power consumption
  • 5% increase in maximum operation voltage
  • 50% faster warm up time
  • 56% increase in lifecycle span

Please Note: A 18mm o2 sensor bung is required on the exhaust header. If your exhaust header pipe does not have an available o2 bung, then you would need to add one.

DISCLAIMER: By purchasing products from this store it is recommended you engage a qualified mechanic to ensure safe and correct installation of all parts & accessories. The customer agrees and accepts it is their responsibility for all installations and modifications which can result in damage, engine failure if installed incorrectly of which Monkey Bike World Pty Ltd can not be held responsible.

Warranty of the products are given by the original manufacturer.  Warranty is void if the product is modified in any particular way and used in a process that is not for its intended purpose.  All items are inspected prior to dispatch and are deemed to be fit for purpose.

We are unable to offer warranty on any engine parts or kits due to the uncontrollable stresses that can be placed on these parts of which we have no control over.  It is recommended to follow the manufactures guidelines who have already pushed and tested their products fully.


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