Used Mercedes-Benz B-Class Glow Plugs

The B-Class has been sold with both petrol and diesel engines, and glow plugs only exist on the diesel variants – petrol engines use spark plugs instead. If your B-Class is a diesel (common examples include the B180 CDI, B200 CDI, and B220 CDI), it will have glow plugs. If yours is a petrol model, you need spark plugs, not glow plugs – check your V5 or a VIN check to confirm your fuel type before requesting quotes.

These are different generations with different engine families, so glow plugs from the W245 (2005–2011) will generally not cross directly to the W246 (2012–2018). The most reliable way to confirm is to match the engine code exactly – your engine code is stamped on the block and listed on your V5 or via a VIN check. Confirm compatibility with the breaker quoting you before purchasing.

The W246 B-Class ran from 2012 to 2018 and received a facelift in 2015, but whether the diesel engine codes and glow plug specifications changed across that boundary is something you should confirm against your specific registration with the breaker. Engine code is the key detail here – if the code is identical on both cars, the plugs are very likely to be the same, but mid-production ancillary changes can occur. Always give the breaker your full engine code to be certain.

No – trim level makes no difference to glow plug fitment on the B-Class; SE, Sport, and AMG Line are cosmetic and equipment packages, not mechanical differences. What matters is the engine code, which will be the same across trims sharing the same diesel engine. Just confirm your engine code with the breaker and the trim name can be ignored for this part.

Diesel engines typically have one glow plug per cylinder, so a four-cylinder B-Class diesel (the most common fitment, covering engines like the B180 CDI and B200 CDI) will need four glow plugs. It is generally recommended to replace the full set at once rather than individual plugs, so make sure you request a full set of four when contacting breakers. Confirm the cylinder count for your specific engine code if you are unsure.

A 2009 B200 CDI sits in the first-generation W245 (2005–2011), so glow plugs from another W245 diesel with the same engine code are your best starting point for a compatible used part. Cross-referencing by engine code rather than model year alone is the safest approach, as different diesel variants within the same generation can use different plugs. Give the breaker your engine code – found on the block or via a VIN check – and they can confirm a match before you commit.