Chassis Context
The 2015 Mercedes-Benz Sprinter NCV3 runs the NCV3 chassis, which launched in the UK in 2006 — a year ahead of North America. Most UK NCV3s carry the 2.1L four-cylinder diesel (OM646 until mid-2009, OM651 after) rather than the OM642 V6 that dominated the US market; badges read 209–519 CDI, with the first digit indicating tonnage and the last two roughly horsepower divided by ten. Euro 6 BlueTEC with AdBlue was optional from 2013 and standard on new registrations from September 2016 — earlier UK NCV3s have no AdBlue system at all. Check recalls at the DVSA vehicle recall service on gov.uk, not NHTSA. The SAM-module and ground-strap guidance familiar from Sprinter forums applies to UK vans exactly as it does elsewhere.
What's Specific to the 2015 Mercedes-Benz Sprinter NCV3
The 2015 UK Sprinter sits in the Euro 5/Euro 6 split years: Euro 6 BlueTEC (with the 18L AdBlue tank) was optional from 2013 and became effectively standard for new registrations in September 2016 — so a 2015 may or may not have AdBlue; check for the filler next to the diesel cap. Crucially for this build window: vans built October 2013 to June 2018 fall inside the May 2019 DVSA glow-plug-relay recall (114,800 RHD UK Sprinters — moisture ingress can short the relay, with a fire risk; the fix is a free ~30-minute relay and cover replacement). Verify yours at the gov.uk recall checker. MOT note: the visual DPF check has applied since February 2014.
Common Symptoms
EGR Valve Problems on the 2015 Mercedes-Benz Sprinter NCV3 typically presents with one or more of these symptoms. The severity, frequency, and diagnostic steps vary significantly by chassis generation, which is why the causes below are written specifically for the NCV3 of the 2015 production year rather than generic "Sprinter" advice.
Likely Causes for the 2015 Mercedes-Benz Sprinter NCV3
For the 2015 model year, the most common root causes involve age-related wear, the specific engineering tolerances of the 2015 production run, and documented chassis issues noted in the chassis context above.
On the 2015's OM651, two distinct EGR failures present similarly: the valve itself soots and sticks (P0400/P0401/P0402), and the EGR cooler can crack internally — the giveaway there is unexplained coolant loss with sweet-smelling white exhaust smoke. A useful field check when the valve comes off: dry soot points at a clogged valve; wet, slimy soot points at a failed cooler pushing coolant through. Access is tight on the OM651, so quote labour accordingly.
What to Do
Start by checking the most common causes listed above. For a step-by-step diagnosis specific to your symptoms, use our free AI Expert chat or the interactive diagnostic tool — both are trained specifically on Sprinter NCV3-based RVs and know the 2015 Mercedes-Benz Sprinter NCV3 inside and out.
Other 2015 Mercedes-Benz Sprinter NCV3 Issues
Owners of the 2015 Mercedes-Benz Sprinter NCV3 also commonly report these problems:
- Battery Drain
- DEF / AdBlue Warning
- DPF Regeneration Problems
- Glow Plug Failure
- Injector Seal Leak
- Limp Mode
Mercedes-Benz Sprinter NCV3 EGR Valve Problems by Year
This issue across other model years: 2012 · 2013 · 2014 · 2016 · 2017 · 2018