S4337 12V 1.7kW Starter Motor Fits BMW 540i, BMW 630i, BMW 640i

Description

S4337 Replacement Starter Motor

Choose a replacement by comparing the S4337 starter motor and its Lucas reference, LRS04337, with your existing unit. The listed electrical rating is 12V 1.7kW. A starter motor turns the engine during starting; the electrical rating and mechanical engagement must suit the application. Applications include selected BMW 540i 3.0 Mild Hybrid/petrol variants.

Key Features and Benefits

• 12V electrical system: match the vehicle voltage before selecting a unit.
• 1.7kW power: compare the listed rating with the original starter motor.
• 14-tooth pinion: compare gear engagement and pinion position.
• Clockwise rotation: check the specified direction before fitting.
• M8 B+ connector / terminal: check the connection against the original unit.

Compatible Vehicles and Applications

• BMW 540i 3.0 Mild Hybrid/petrol – selected applications 2020 – (engine code B58B30C).
• BMW 630i 3.0 Petrol – selected applications 2019 – (engine code B58B30C).
• BMW 640i 3.0 Mild Hybrid/petrol – selected applications 2020 – (engine code B58B30C).
• BMW 740i 3.0 Petrol – selected applications 2019–2022 (engine code B58B30C).
• BMW 840i 3.0 Petrol – selected applications 2019–2020 (engine code B58B30C).
• BMW 840i Coupe 3.0 Petrol – selected applications 2019–2020 (engine code B58B30C).

These are selected applications, not the complete fitment list. Check the detailed vehicle compatibility table, engine code and production year, then compare the original unit before ordering.

OE Numbers and Cross-Reference Information

The following cross-reference numbers are associated with S4337. Compare them with the original unit and technical specifications; a number match alone does not establish vehicle compatibility.

438000-4550, 438000-4551, 438000-4552, LRS04337, LRS4337

The full manufacturer cross-reference and OE listings are available elsewhere on this page. Confirm whether a number is an OE or aftermarket reference when comparing the original unit.

When Should You Replace Your Starter Motor?

Failure to crank, clicking during a start request or intermittent cranking can indicate a starting-system problem. A weak battery, poor connections or control-circuit faults can produce similar symptoms; test the system before replacing the starter motor.

Why Buy from Sahibs Auto Electrics?

Sahibs Auto Electrics is a UK automotive electrical parts specialist supplying alternators and starter motors. Ask for help identifying S4337 using the existing part number and vehicle details. Check the current condition options and availability before purchase. Buy online for UK delivery or Click & Collect, checking the current order arrangements.

Frequently Asked Questions

Will S4337 fit my BMW 540i?

BMW 540i 3.0 Mild Hybrid/petrol (2020 -) is a listed application. Confirm the engine code and original unit configuration in the detailed fitment table.

Does S4337 replace Lucas LRS04337?

Lucas LRS04337 is a listed identification reference. Compare it with the original unit and specifications; a cross-reference does not guarantee compatibility by itself.

What specifications are listed for S4337?

The listed details include 12V, 1.7kW power, 14 pinion teeth, clockwise rotation. Compare the complete specifications on this page with the unit being replaced.

Is S4337 new or remanufactured?

Check the current product condition selection for S4337. Confirm the supplier and availability of the option you want before completing the order.

What should I compare before ordering S4337?

Compare 12V compatibility, 1.7kW power, 14 pinion teeth, rotation, mounting and electrical connections with the original starter.

Does clicking prove the starter motor has failed?

No. Battery voltage, wiring and control-circuit faults can also cause clicking or no cranking. Have the starting system tested before choosing a replacement.