The glow plug control relay (OEM 6461532579) is a key engine electrical component designed to manage the operation of the glow plug system on Mercedes-Benz diesel engines. It functions as the control module that regulates electrical current to the glow plugs at start-up, ensuring precise timing and power delivery during the pre-heating phase. Without a properly working relay, pre-heating may be insufficient or inconsistent, leading to difficult engine starts, excessive exhaust smoke, and reduced combustion efficiency. This replacement unit is engineered to match original equipment specifications for fit and reliability on compatible Mercedes vehicles.

OEM Number: 6461532579, 2502195, A646153257980, 646153257980
 
Operating Voltage : 12V

Number of Cylinders : 4

Quantity : 1

Make	Model	Variant	Type	Engine	Chassis	Year
Mercedes-Benz	C-Class	Diesel Coupe	C 200 CDI	2148cc 90KW 122HP OM 646.962	RWD -- CL203	2003-2008
Mercedes-Benz	C-Class	Diesel Coupe	C 220 CDI	2148cc 110KW 150HP OM 646.963	RWD -- CL203	2004-2008
Mercedes-Benz	C-Class	Diesel Estate	C 200 CDI	2148cc 100KW 136HP OM 646.811	RWD -- S204	2007-2009
Mercedes-Benz	C-Class	Diesel Estate	C 200 CDI	2148cc 90KW 122HP OM 646.962;OM 646.963	RWD -- S203	2003-2007
Mercedes-Benz	C-Class	Diesel Estate	C 220 CDI	2148cc 110KW 150HP OM 646.963	RWD -- S203	2004-2007
Mercedes-Benz	C-Class	Diesel Estate	C 220 CDI	2148cc 120KW 163HP OM 646.811	RWD -- S204	2007-2008
Mercedes-Benz	C-Class	Diesel Estate	C 220 CDI	2148cc 125KW 170HP OM 646.811	RWD -- S204	2007-2008
Mercedes-Benz	C-Class	Diesel Saloon	C 200 CDI	2148cc 100KW 136HP OM 646.811;OM 646.812	RWD -- W204	2007-2009
Mercedes-Benz	C-Class	Diesel Saloon	C 200 CDI	2148cc 75KW 102HP OM 611.962	RWD -- W203	2001-2003
Mercedes-Benz	C-Class	Diesel Saloon	C 200 CDI	2148cc 90KW 122HP OM 646.962;OM 646.963	RWD -- W203	2003-2007
Mercedes-Benz	C-Class	Diesel Saloon	C 220 CDI	2148cc 105KW 143HP OM 611.962;OM 646.963	RWD -- W203	2000-2007
Mercedes-Benz	C-Class	Diesel Saloon	C 220 CDI	2148cc 110KW 150HP OM 646.963	RWD -- W203	2003-2007
Mercedes-Benz	C-Class	Diesel Saloon	C 220 CDI	2148cc 120KW 163HP OM 646.811	RWD -- W204	2007-2008
Mercedes-Benz	C-Class	Diesel Saloon	C 220 CDI	2148cc 125KW 170HP OM 646.811	RWD -- W204	2007-2008
Mercedes-Benz	CLC-Class	Diesel Coupe	CLC 200 CDI	2148cc 90KW 122HP OM 646.962	RWD -- CL203	2008-2011
Mercedes-Benz	CLC-Class	Diesel Coupe	CLC 220 CDI	2148cc 110KW 150HP OM 646.963	RWD -- CL203	2008-2011
Mercedes-Benz	CLK	Diesel Coupe	CLK 220 CDI	2148cc 100KW 136HP OM 646.966	RWD -- C209	2005-2009
Mercedes-Benz	CLK	Diesel Coupe	CLK 220 CDI	2148cc 110KW 150HP OM 646.966	RWD -- C209	2005-2009
Mercedes-Benz	E-Class	Diesel Estate	E 200 CDI	2148cc 100KW 136HP OM 646.821	RWD -- S211	2006-2009
Mercedes-Benz	E-Class	Diesel Estate	E 220 T CDI	2148cc 100KW 136HP OM 611.961	RWD -- S210	1999-2003
Mercedes-Benz	E-Class	Diesel Estate	E 220 T CDI	2148cc 120KW 163HP OM 646.821	RWD -- S211	2003-2009
Mercedes-Benz	E-Class	Diesel Estate	E 220 T CDI	2148cc 125KW 170HP OM 646.821	RWD -- S211	2006-2009
Mercedes-Benz	E-Class	Diesel Estate	E 250 T Turbo-D	2497cc 110KW 150HP OM 605.962	RWD -- S210	1997-1999
Mercedes-Benz	E-Class	Diesel Estate	E 270 T CDI	2685cc 120KW 163HP OM 612.961	RWD -- S210	2000-2003
Mercedes-Benz	E-Class	Diesel Estate	E 270 T CDI	2685cc 125KW 170HP OM 612.961	RWD -- S210	1999-2003
Mercedes-Benz	E-Class	Diesel Saloon	E 200 CDI	2148cc 100KW 136HP OM 646.820	RWD -- W211	2006-2008
Mercedes-Benz	E-Class	Diesel Saloon	E 200 CDI	2148cc 75KW 102HP OM 646.951	RWD -- W211	2002-2008
Mercedes-Benz	E-Class	Diesel Saloon	E 200 CDI	2148cc 90KW 122HP OM 646.951	RWD -- W211	2002-2008
Mercedes-Benz	E-Class	Diesel Saloon	E220 CDI	2148cc 100KW 136HP OM 646.961	RWD -- W211	2002-2008
Mercedes-Benz	E-Class	Diesel Saloon	E220 CDI	2148cc 110KW 150HP OM 646.961	RWD -- W211	2002-2008
Mercedes-Benz	E-Class	Diesel Saloon	E220 CDI	2148cc 125KW 170HP OM 646.821	RWD -- W211	2006-2008
Mercedes-Benz	E-Class	Diesel Saloon	E220 CDI	2149cc 120KW 163HP OM 646.821	RWD -- W211	2003-2008
Mercedes-Benz	Sprinter 3-T	Diesel Bus	211 CDI	2148cc 80KW 109HP OM 646.985	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3-T	Diesel Bus	215 CDI	2148cc 110KW 150HP OM 646.986;OM 646.989;OM 646.990	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3-T	Diesel Chassis Cab	209 CDI	2148cc 65KW 88HP OM 646.984	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3-T	Diesel Chassis Cab	211 CDI	2148cc 80KW 109HP OM 646.985	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3-T	Diesel Chassis Cab	213 CDI	2148cc 95KW 129HP OM 646.986	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3-T	Diesel Chassis Cab	215 CDI	2148cc 110KW 150HP OM 646.986;OM 646.989;OM 646.990	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3-T	Diesel Van	209 CDI	2148cc 65KW 88HP OM 646.984	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3-T	Diesel Van	211 CDI	2148cc 80KW 109HP OM 646.985	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3-T	Diesel Van	213 CDI	2148cc 95KW 129HP OM 646.986	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3-T	Diesel Van	215 CDI	2148cc 110KW 150HP OM 646.986;OM 646.989;OM 646.990	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3.5-T	Diesel Bus	311 CDI	2148cc 80KW 109HP OM 646.985	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3.5-T	Diesel Bus	315 CDI	2148cc 110KW 150HP OM 646.986;OM 646.989;OM 646.990	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3.5-T	Diesel Bus	315 CDI 4x4	2148cc 110KW 150HP OM 646.986;OM 646.989;OM 646.990	AWD -- B906	2008-2009
Mercedes-Benz	Sprinter 3.5-T	Diesel Chassis Cab	309 CDI (906.131, 906.133, 906.135, 906.231, 906.233,...	2148cc 65KW 88HP OM 646.984	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3.5-T	Diesel Chassis Cab	311 CDI (906.131, 906.133, 906.135, 906.231, 906.233,...	2148cc 80KW 109HP OM 646.985	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3.5-T	Diesel Chassis Cab	311 CDI 4x4 (906.131, 906.133, 906.135, 906.231, 906.233...	2148cc 80KW 109HP OM 646.985	AWD -- B906	2008-2009
Mercedes-Benz	Sprinter 3.5-T	Diesel Chassis Cab	313 CDI (906.131, 906.133, 906.135, 906.231, 906.233,...	2148cc 95KW 129HP OM 646.986	RWD -- B906	2006-2016
Mercedes-Benz	Sprinter 3.5-T	Diesel Chassis Cab	315 CDI (906.131, 906.133, 906.135, 906.231, 906.233,...	2148cc 110KW 150HP OM 646.986;OM 646.989;OM 646.990	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 3.5-T	Diesel Chassis Cab	315 CDI 4x4 (906.131, 906.133, 906.135, 906.231, 906.233...	2148cc 110KW 150HP OM 646.986;OM 646.989;OM 646.990	AWD -- B906	2008-2009
Mercedes-Benz	Sprinter 4.6-T	Diesel Chassis Cab	411 CDI	2148cc 80KW 109HP OM 646.985	RWD -- B906	2009-2018
Mercedes-Benz	Sprinter 4.6-T	Diesel Chassis Cab	415 CDI	2148cc 110KW 150HP OM 646.986;OM 646.989;OM 646.990	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 4.6-T	Diesel Van	411 CDI	2148cc 80KW 109HP OM 646.985	RWD -- B906	2009-2018
Mercedes-Benz	Sprinter 4.6-T	Diesel Van	415 CDI	2148cc 110KW 150HP OM 646.986;OM 646.989;OM 646.990	RWD -- B906	2009-2009
Mercedes-Benz	Sprinter 5-T	Diesel Van	509 CDI	2148cc 65KW 88HP OM 646.984	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 5-T	Diesel Van	511 CDI	2148cc 80KW 109HP OM 646.985	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 5-T	Diesel Van	511 CDI 4x4	2148cc 80KW 109HP OM 646.985	AWD -- B906	2006-2009
Mercedes-Benz	Sprinter 5-T	Diesel Van	513 CDI	2148cc 95KW 129HP OM 646.986	RWD -- B906	2009-2016
Mercedes-Benz	Sprinter 5-T	Diesel Van	515 CDI	2148cc 110KW 150HP OM 646.986;OM 646.989;OM 646.990	RWD -- B906	2006-2009
Mercedes-Benz	Sprinter 5-T	Diesel Van	515 CDI 4x4	2148cc 110KW 150HP OM 646.986;OM 646.989;OM 646.990	AWD -- B906	2006-2009
Mercedes-Benz	Sprinter Classic 3.5-T	Diesel Van	311 CDI	2148cc 80KW 109HP OM 646.701	RWD -- B909	2013-2024
Mercedes-Benz	Sprinter Classic 4.6-T	Diesel Bus	411 CDI	2148cc 80KW 109HP OM 646.701	RWD -- B909	2013-2024
Mercedes-Benz	Viano	Diesel Bus	CDI 2.0	2148cc 80KW 109HP OM 646.982	RWD -- W639	2003-2024
Mercedes-Benz	Viano	Diesel Bus	CDI 2.0	2148cc 85KW 116HP OM 646.982	RWD -- W639	2005-2024
Mercedes-Benz	Viano	Diesel Bus	CDI 2.0 4-matic	2148cc 80KW 109HP OM 646.982	AWD -- W639	2005-2024
Mercedes-Benz	Viano	Diesel Bus	CDI 2.0 4-matic (639.711, 639.713, 639.811, 639.813,...	2148cc 85KW 116HP OM 646.982	AWD -- W639	2006-2024
Mercedes-Benz	Viano	Diesel Bus	CDI 2.2	2148cc 110KW 150HP OM 646.980;OM 646.982	RWD -- W639	2003-2024
Mercedes-Benz	Viano	Diesel Bus	CDI 2.2 4-matic (639.711, 639.713, 639.811, 639.813,...	2148cc 110KW 150HP OM 646.982	AWD -- W639	2005-2024
Mercedes-Benz	Vito	Diesel Bus	109 CDI	2148cc 65KW 88HP OM 646.983	RWD -- W639	2003-2024
Mercedes-Benz	Vito	Diesel Bus	109 CDI	2148cc 70KW 95HP OM 646.980;OM 646.981	RWD -- W639	2006-2024
Mercedes-Benz	Vito	Diesel Bus	109 CDI 4x4	2148cc 70KW 95HP OM 646.981	AWD -- W639	2007-2014
Mercedes-Benz	Vito	Diesel Bus	111 CDI	2148cc 80KW 109HP OM 646.982	RWD -- W639	2003-2024
Mercedes-Benz	Vito	Diesel Bus	111 CDI	2148cc 85KW 116HP OM 646.980	RWD -- W639	2007-2024
Mercedes-Benz	Vito	Diesel Bus	111 CDI 4x4	2148cc 80KW 109HP OM 646.982	AWD -- W639	2007-2014
Mercedes-Benz	Vito	Diesel Bus	115 CDI	2148cc 110KW 150HP OM 646.980;OM 646.982	RWD -- W639	2003-2024
Mercedes-Benz	Vito	Diesel Bus	115 CDI 4x4	2148cc 110KW 150HP OM 646.982	AWD -- W639	2007-2014
Mercedes-Benz	Vito / Mixto	Diesel Van	109 CDI	2148cc 65KW 88HP OM 646.983	RWD -- W639	2003-2024
Mercedes-Benz	Vito / Mixto	Diesel Van	109 CDI	2148cc 70KW 95HP OM 646.980;OM 646.981	RWD -- W639	2006-2024
Mercedes-Benz	Vito / Mixto	Diesel Van	111 CDI	2148cc 80KW 109HP OM 646.982	RWD -- W639	2003-2024
Mercedes-Benz	Vito / Mixto	Diesel Van	111 CDI	2148cc 85KW 116HP OM 646.980;OM 646.982	RWD -- W639	2007-2024
Mercedes-Benz	Vito / Mixto	Diesel Van	111 CDI 4x4	2148cc 80KW 109HP OM 646.982	AWD -- W639	2007-2024
Mercedes-Benz	Vito / Mixto	Diesel Van	115 CDI	2148cc 110KW 150HP OM 646.980;OM 646.982	RWD -- W639	2003-2024
Mercedes-Benz	Vito / Mixto	Diesel Van	115 CDI 4x4	2148cc 110KW 150HP OM 646.982	AWD -- W639	2006-2024
Make	Model	Variant	Type	Engine	Chassis	Year

Our SKU: TM6461532579_94

All our Glow Plug Control Relay 6461532579 are OEM quality and reliable after market car parts. This Glow Plug Control Relay 6461532579 is specifically compatible with Mercedes-Benz: C-Class, CLC-Class, CLK, E-Class, Sprinter 3-T, Sprinter 3.5-T, Sprinter 4.6-T, Sprinter 5-T, Sprinter Classic 3.5-T, Sprinter Classic 4.6-T, Viano, Vito, Vito / Mixto, .

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part to your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

Key Benefits

Precise Glow Plug Control
The relay accurately governs the current supplied to each glow plug, ensuring the required power and timing for efficient cylinder pre-heating during cold starts. This controlled pre-heating promotes smoother ignitions and consistent diesel combustion.

Restores Reliable Cold Starts
A malfunctioning relay can cause extended crank times, hard starts, or failure to start, especially in colder weather conditions. Replacing the relay restores reliable engine starts when temperatures drop. 

OEM-Compatible Fit
This replacement relay is designed to match OEM reference number 6461532579 (also listed as A6461532579) and installs directly in place of the original without requiring modification.

Improves Engine Performance and Emissions
Accurate glow plug operation helps ensure complete combustion at start-up, which can reduce white smoke emissions, minimise check engine or glow plug warning lights, and improve overall fuel efficiency during warming phases.

Durable Construction
Manufactured from quality electrical components, this control relay is built to withstand typical under-hood conditions and provide dependable long-term performance when fitted correctly.

Frequently Asked Questions (FAQs)

Q: What does the glow plug control relay do?
A: The glow plug control relay regulates the electrical current delivered to the glow plugs based on input from the engine control unit, enabling correct pre-heating of the combustion chambers so the diesel engine starts smoothly and efficiently.

Q: What are common symptoms of a faulty glow plug control relay?
A: Symptoms of relay issues include hard starting, especially in cold weather, extended crank times, rough engine idle after start-up, excessive white smoke from the exhaust, and illumination of glow plug or engine warning lights.

Q: Which vehicles use part number 6461532579?
A: Part number 6461532579 is commonly used on a range of Mercedes-Benz diesel models including C-Class (W204), E-Class (W211, S211), and other related CDi applications. Always verify compatibility with your VIN or existing part number before ordering.

Q: Is this relay a direct replacement part?
A: Yes. This glow plug control relay is designed as a direct replacement for the original unit with OEM reference 6461532579/A6461532579 and installs without requiring additional modifications.

Q: Should I check glow plugs when replacing the relay?
A: Yes. Although the relay controls current to the glow plugs, it’s good practice to inspect the glow plugs and related wiring when experiencing start-up issues, as faults in multiple components can produce similar symptoms.