Used BMW i4 Oxygen Sensor

No — the BMW i4 is a fully electric vehicle and has never been fitted with an oxygen sensor on any variant. Oxygen sensors (lambda sensors) are part of a combustion exhaust system, which the i4 simply does not have. If you are searching for this part, it is possible you have the wrong vehicle listed, or you may be thinking of a different BMW model such as the 4 Series Gran Coupé (G26), which shares the i4's body but is available with petrol and diesel engines that do use oxygen sensors.

This is almost certainly an error. The BMW i4 (G26) is a battery-electric vehicle with no internal combustion engine, so it has no exhaust system and therefore no oxygen sensors. If a breaker or seller is quoting you an oxygen sensor for an i4, it is worth double-checking that the registration number has been entered correctly and has not been confused with the equivalent petrol or diesel G26 4 Series Gran Coupé.

The BMW G26 4 Series Gran Coupé shares its bodyshell with the i4 and is available with combustion engines — including petrol and diesel variants — that are fitted with oxygen sensors. If you need an oxygen sensor for a car that looks like an i4, confirm with the breaker that they are supplying a part from the correct G26 combustion-engine variant matched to your specific engine code, as oxygen sensor fitment varies between engine families and emissions standards.

If your i4 is displaying a fault that has been described as an oxygen sensor issue, it is worth having the diagnosis re-checked by a BMW specialist, as the i4 has no oxygen sensors to fail. Electric vehicles have their own sensor and monitoring systems for battery, thermal management, and drivetrain that can sometimes be misidentified by generic diagnostic tools not fully calibrated for EVs.