Change Car Glow Plugs Mercedes-Benz CLS
Change Car Glow Plugs
| Estimated time | 1h30–2h00 |
|---|---|
| Estimated labour cost | ~150–200£ |
| Difficulty | Intermediate |
| Vehicles |
CLS 2005-2011 2
CLS 2010-2017 9
CLS 2018-2023 3
|
What is the role of Mercedes-Benz CLS glow plugs?
Glow plugs are used in diesel engines to preheat the combustion chamber before starting, particularly in cold weather. Unlike petrol engines that use spark plugs to ignite the fuel, diesel engines rely on compression ignition. Modern glow plugs also remain active after starting to reduce emissions and noise during the warm-up phase.
When should you change your Mercedes-Benz CLS glow plugs?
Generally, glow plugs last between 80,000 and 160,000 km. Symptoms of failing glow plugs include: difficulty starting in cold weather, white or grey exhaust smoke on start-up, rough idle during warm-up, the glow plug warning light remaining illuminated, and increased fuel consumption.
How do I know if the Mercedes-Benz CLS glow plugs need changing?
Via the EOBD diagnostic system, faulty glow plugs will trigger fault codes (typically P0380–P0384 for glow plug circuit faults). Individual glow plug resistance can be measured with a multimeter (typically 0.5–2 ohms for a good plug).
Is it difficult to change Mercedes-Benz CLS glow plugs?
Difficulty level 3/5: intermediate. Glow plugs can seize in the cylinder head over time due to heat and corrosion, making removal difficult and risking breakage. Key steps: warm the engine first, apply penetrating oil, use the correct glow plug socket, unscrew carefully (do not force — a broken glow plug requires specialist extraction).
3 models covered
| Model | Year Range | Engines covered | Fuel |
|---|---|---|---|
| CLS 2005-2011 | 2005-2011 | 280 Petrol (272.943), 320 CDI Diesel (642.920), 350 CDI Diesel (642.920), 350 CGi Petrol (272.985), 350, -LPG LPG,Petrol (272.964), 500, -LPG LPG,Petrol (113.967), 500/550 Petrol (273.960), 55 AMG V8 Kompressor Petrol (113.990), 63 AMG Petrol (156.983) | Diesel, LPG, Petrol |
| CLS 2010-2017 | 2010-2017 | 220 BlueTEC, -T Diesel (651.924), 250 BlueTEC, -4MATIC Diesel (651.924), 250 CDI BlueEFF Diesel (651.924), 350 BlueEFF Petrol (276.952), 350 BlueTEC 4MATIC Diesel (642.858), 350 BlueTEC 4MATIC Diesel (642.858), 350 BlueTEC Diesel (642.852), 350 CDI 4MATIC Diesel (642.858), 350 C… | Diesel, Petrol |
| CLS 2018-2023 | 2018-2023 | 300 d Diesel (654.920), 350 EQ Boost, -4MATIC 48V (MHEV),Petrol (264.920), 350d, -4MATIC Diesel (656.929), 400d 4MATIC Diesel (656.929), 450 EQ Boost, -4MATIC 48V (MHEV),Petrol (256.930), 53 AMG 4MATIC 48V (MHEV),Petrol (256.930) | 48V (MHEV), Diesel, Petrol |
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