Bentley Continental GT & Flying Spur Webasto Auxiliary Heater

Part Number: 3W0815005J (and related 3W0815005E/F) System: Stationary/Auxiliary Heating System (Webasto)

The part number 3W0815005J refers to the Webasto auxiliary heater unit (Standheizung) used in the first and second generations of the Bentley Continental GT and Flying Spur. This system is designed to pre-warm the engine coolant and the vehicle interior before the engine is even started, which is a common factory option for vehicles sold in colder climates.

1. Function & Operation

• Engine Pre-heating: It burns fuel from the vehicle’s main tank to heat the engine coolant, reducing wear during cold starts.

• Cabin Comfort: It operates the vehicle’s HVAC blowers to defrost windows and warm the cabin without the engine running.

• Control: Can be operated via the infotainment system (MMI) timers or, more commonly, via a dedicated Webasto remote key fob.

2. Compatibility

This specific unit and its revisions are designed for the 6.0L W12 and 4.0L V8 engines in the following models:

• Bentley Continental GT: 2003–2010 (MK1) and 2011–2018 (MK2).

• Bentley Continental Flying Spur: 2006–2012 (MK1) and 2013–2019 (MK2).

Superseded Part Numbers: The system has seen several revisions. If you cannot find a J suffix, the following are often interchangeable (though software versions may vary):

• 3W0815005E

• 3W0815005F

• 3W0815005G

3. Common Components & Issues

The Webasto system is complex and often fails due to lack of use during summer months.

• “Lockout” Mode: If the heater fails to start 3 times (due to low fuel or air in the lines), the ECU will enter a “Lockout” state. This can only be cleared using VCDS/VAG-COM or Bentley ODIS diagnostics.

• Remote Pairing: If the remote doesn’t work after a battery change, it usually requires a “re-learn” procedure involving pulling the fuse for the Webasto unit (located in the trunk/boot fuse box) and holding the ‘OFF’ button on the remote within 5 seconds of re-inserting the fuse.