Cheap Mercedes-Benz EQB Engine Wiring Loom

No — the EQB is a fully electric vehicle with no internal combustion engine, so there is no engine wiring loom on any variant of this model. What the EQB does have is a high-voltage battery harness, a motor control wiring loom (connecting the inverter and electric drive unit), and a 12V auxiliary wiring harness, any of which could be what you actually need. If you're chasing an electrical fault or replacing damaged wiring, contact a breaker and describe exactly where the wiring runs and what system it serves, so they can identify the correct harness from a donor EQB.

It's likely a mislabelling, since the EQB has no combustion engine and therefore no engine wiring loom in the traditional sense. The part you probably need is either the high-voltage motor harness (which connects the electric drive unit and inverter) or the 12V auxiliary loom — both are sometimes loosely called an 'engine loom' by sellers unfamiliar with EVs. When contacting a breaker, give them your full registration or VIN so they can pull the correct harness for your exact EQB variant, as the 350 4MATIC (dual-motor, four-wheel drive) and 300 (single-motor, front-wheel drive) have different drive configurations and associated wiring.

Depending on your fault, you'd typically be looking for the HV (high-voltage) battery harness, the inverter or motor control harness, or the low-voltage 12V auxiliary harness — not an engine loom, which simply doesn't exist on an all-electric vehicle like the EQB. The EQB was produced from 2022 onwards in the UK as a single generation (X243 platform), so generation compatibility is straightforward, but always confirm the exact harness type and routing with the breaker against your registration, as minor build-date changes mid-production can affect connector configurations.

Because the EQB sits within a single X243-generation production run (UK market from 2022), there are no separate facelifted generations to contend with in the way you'd find on a combustion-engined model. However, mid-production running changes to ancillary wiring layouts and connector types do occur on EVs, so whether a 2022-sourced harness is a direct swap onto a 2024 car is something you should confirm with the breaker against both registrations before purchasing.

Yes, almost certainly — the 300 is a single-motor front-wheel-drive variant, while the 350 4MATIC has dual motors and four-wheel drive, meaning the motor control and inverter wiring will differ between the two. When sourcing any EQB harness, make sure the donor vehicle matches your drivetrain configuration, not just the body style or trim badge. Give your breaker your full VIN rather than just the model name, as this is the most reliable way to ensure the correct harness is supplied.

For the motor, inverter, or battery wiring, trim level makes no difference — AMG Line is a cosmetic and equipment package that does not alter the drivetrain or its associated wiring. What does matter is the drivetrain variant (300 vs 350 4MATIC) and the specific system the harness serves, so focus on matching those details rather than the trim name. Your breaker will need your registration or VIN to confirm the exact part, as that identifies your drivetrain and build specification more reliably than the trim badge alone.