BMW M8 Ignition Switch Replacement Parts

The BMW M8 (F91/F92/F93, launched 2019) does not use a traditional ignition switch with a physical key barrel — it uses a fully electronic push-button start system operated via the BMW Display Key or key fob, so there is no conventional ignition switch to replace as a single mechanical part. If your M8 is not starting or the ignition system is misbehaving, the fault is more likely to lie with the ELV (electronic steering lock), the start/stop button module, the CAS (Car Access System) module, or the key itself. A BMW specialist or main dealer with diagnostic equipment is the right first step to pinpoint the faulty component before sourcing any used parts.

Because the M8 has no physical ignition switch, the component most likely to cause key-recognition or no-start faults is the CAS (Car Access System) module, which handles key authentication and start authorisation — this is the part you should be asking breakers for. The start/stop button itself can also fail and is a separate, sourceable part from a dismantler. Confirm the exact fault code with a BMW-capable diagnostic tool (such as ISTA) before ordering, as the CAS module is VIN-linked and will require coding to your car after fitting.

Trim level — whether your M8 is a standard M8, M8 Competition, or M8 50 Jahre Edition — does not affect the underlying CAS module or start/stop button specification, as these are shared across the M8 range on the same generation platform. The cosmetic appearance of the start/stop button surround may differ slightly between interior specifications, so check the physical look matches if appearance matters to you. Confirm the exact part number with the breaker against your registration to be certain of compatibility.

All BMW M8 models sold in the UK fall within the single F91 (convertible), F92 (coupé), and F93 (Gran Coupé) generation, which ran from 2019 onwards with no full generational change within that period, so there was no major platform break that would obviously prevent interchange across those years. However, BMW does revise electronic modules during a production run, and CAS units in particular are VIN-coded, so a unit from a 2019 car may not simply plug in to a 2022 car without specialist coding. Always confirm compatibility with the breaker against your exact registration, and factor in the cost of BMW coding when budgeting for a used CAS module.

Depending on your symptom, the parts to search for are: 'BMW M8 CAS module' or 'BMW M8 Car Access System' for key-recognition and immobiliser faults, 'BMW M8 start stop button' for a physically damaged or unresponsive button, or 'BMW M8 steering lock ELV' if you have a steering lock fault. Quoting your registration to the breaker will help them pull the right part from an M8 of the correct specification. A diagnostic read before you order will save time and money, as these parts can be expensive and may need coding to your vehicle after fitting.