BMW i3 Lambda Sensor Replacement Parts

No — the BMW i3 is a fully electric vehicle (BEV) in its standard form and has no internal combustion engine, no exhaust system, and therefore no lambda sensor whatsoever. The range-extender variant (i3 REx) does have a small two-cylinder petrol engine, but BMW's REx system runs that engine in a very narrow, controlled band and does not use a conventional lambda sensor in the way a traditional petrol car does. If you've been quoted for a lambda sensor for your i3, it's worth double-checking whether you've been given the correct part — you may be thinking of a different BMW model entirely. A breaker or BMW specialist will be able to confirm what emissions-related components, if any, are present on the REx variant your registration corresponds to.

The i3 REx's 647cc two-cylinder range-extender engine is a very unusual unit designed to maintain battery charge rather than drive the wheels in a conventional sense, and BMW did not fit a traditional upstream/downstream lambda sensor arrangement as you'd find on a standard petrol car. This means the conventional used lambda sensor market — where you search by engine code and emissions era — does not straightforwardly apply to the REx. If you believe your REx has an emissions-related fault, speak directly to a breaker who has dismantled an i3 REx, and confirm against your exact registration and engine code rather than assuming a standard sensor will apply.

Almost certainly not — the i3 REx engine is unique to that application and shares very little with BMW's mainstream petrol engine family, so sensors from other BMW models are extremely unlikely to be compatible. Any emissions components on the REx are specific to that drivetrain, and fitting a sensor from an unrelated BMW engine risks both non-fitment and potential MOT issues. This is firmly confirm-with-the-breaker territory: provide your full registration and ask the dismantler to confirm the exact part number from a like-for-like i3 REx donor car.

If your i3 is the standard all-electric version, there is no exhaust-related component to replace, so it's worth revisiting the fault diagnosis — the issue may relate to the high-voltage battery system, charging components, or another electrical sensor entirely. If you have the REx variant and have an emissions-related warning, a BMW specialist or main dealer is likely a better starting point than a used-parts search, given how unusual the REx engine is. For any other BMW model you may have confused with the i3, a breaker can quote accurately once you provide the correct registration.