New BMW 5 Series 520d Turbo – Ref. 11658519476

Diagnosing a loss of power on your BMW 5 Series 520d

Before replacing the turbocharger on your BMW 5 Series 520d, it is essential to confirm that the fault lies with this component. Reading the engine fault codes, visually inspecting the impeller wheel (axial play, oil traces in the intake), checking the boost pressure and carrying out a road test will help rule out other causes such as an intake leak, a seized wastegate or a faulty pressure sensor. On engines fitted with engine codes N47D20C and N47D20O1, blue smoke from the exhaust, an unusual whistling noise under acceleration or a noticeable loss of power are characteristic signs of a turbo nearing the end of its life.

A new turbo compatible with reference 11658519476

This new turbo is compatible with reference 11658519476, intended for BMW 5 Series models fitted with the 2.0-litre Diesel engine (1995 cm³) producing 163 or 184 hp depending on the version. It is therefore particularly suited to 520d engines fitted to saloon and Touring body styles of this model. Before placing an order, it is recommended that you check the number on the old turbo or on the vehicle's manufacturer plate to ensure an exact match with the equivalent references listed in the technical sheet on this page.

A straightforward purchase – no unit to return

This new turbo is sold as a straightforward purchase: you receive a single delivery and there is no unit to return, no collection to arrange and no deposit to pay. The part comes with a 12-month parts warranty, subject to fitting by a qualified professional. Payment for your order can be spread over several instalments – pay in up to 10 instalments – to help manage your budget.

Tips for extending the life of your 520d turbo

On N47D20 engines, the longevity of the turbocharger depends heavily on the quality and regularity of oil changes, as degraded oil or an insufficient oil level accelerates bearing wear. A clogged air filter or a leaking intercooler can also disrupt the air supply and cause premature overheating. Avoiding immediate high-rev driving after a cold start, and allowing the engine to idle for a short time before switching off after a hard run, will help preserve the turbo.

Points to check before fitting on your 5 Series

Before fitting this new turbo to your BMW 5 Series 520d, inspect the oil circuit (feed and return hoses), replace the seals and check that the oil passages are free from any build-up. The air intake and induction system must be clean and free from debris that could damage the new turbine wheel. When starting up for the first time, pre-lubricating the turbo with oil before the initial start is essential to ensure immediate bearing lubrication.

• Check the reference number on the old turbo before ordering
• Inspect the oil circuit and hoses before fitting
• Pre-lubricate with oil before the first start-up
• Monitor oil quality and change frequency on the N47D20 engine