Used Mercedes-Benz GLA Glow Plugs

Yes, but only on diesel variants — glow plugs are a diesel-engine component used to pre-heat the combustion chamber for cold starts, and petrol GLA models never had them. If your GLA is a diesel (typically badged 200d, 220d, or 250d), it will have glow plugs; if it's a petrol (200, 250, or AMG 45), it does not. Check your V5 or fuel filler cap if you're unsure which engine you have.

Almost certainly not — the X156 and H247 generations use different engine families, and glow plug specifications are tied closely to the engine code rather than the model name. Name the generation boundary confidently: X156 ran from 2013 to 2019 (facelift 2017), and H247 began in 2020, so these are distinct architectures. Confirm compatibility with the breaker by supplying your full engine code from the V5 or a VIN check, as that is the single most reliable way to match the correct plug.

Yes, it can matter — the 200d and 220d may share a similar engine family but can differ in tune, and the glow plug specification follows the engine code precisely rather than the power output badge. Always quote your engine code (found on the V5 or via a VIN check) to the breaker rather than just the badge, as this removes ambiguity. Never assume the 200d and 220d plugs are interchangeable without the breaker confirming against your specific engine code.

No — trim level has no bearing on glow plug fitment whatsoever, as glow plugs are an engine component and SE, AMG Line, and AMG Line Premium trims all use the same engine variants. The differences between these trims are cosmetic and equipment-related (alloys, interior spec, driver aids), none of which touch the engine internals. What matters is your engine code and fuel type, so a 220d in AMG Line trim needs the same plugs as a 220d in SE trim.

The X156 facelift in 2017 was primarily cosmetic and equipment-focused, so the diesel engine codes were largely carried over — meaning glow plugs may well interchange within the X156 generation. However, whether a specific plug from a pre-facelift car fits a post-facelift car is something you should confirm with the breaker against your registration and engine code, as ancillary specification changes mid-production cannot be ruled out. Supplying your exact engine code gives the breaker the best chance of confirming a safe match.

A diesel GLA has one glow plug per cylinder — four-cylinder diesel engines (which cover all standard GLA diesel variants) have four glow plugs in total. When buying from a breaker, you can often source a full set of four from a donor engine, which is worth doing if yours are aged, as plugs tend to wear together. Confirm the engine code with the breaker so they can pull plugs from an engine that matches yours exactly.