Mercedes-Benz S-Class EGR Valve Replacement Parts

EGR valves are fitted to diesel-engined S-Class models, which use exhaust gas recirculation as part of their emissions control systems — common across the OM642 3.0-litre V6 diesel and OM651 diesel units found in variants like the S350 BlueTEC and S300 BlueTEC. Petrol S-Class engines (such as those in the S500 or S63 AMG) do not use EGR in the conventional sense and are very unlikely to have a serviceable EGR valve of this type. If you are unsure whether your specific engine has one, check your engine code — found on the V5C or by quoting your registration to the breaker — before ordering.

The W221 and W222 are distinct generations with different engine management systems, so an EGR valve from a W221 is very unlikely to be a direct fit for a W222 even if both are diesel models — the W222 introduced updated versions of the diesel engines with revised emissions architecture. The key thing to match is the engine code, not just the displacement or body generation. Always confirm with the breaker using your registration and engine code before purchasing across this generation boundary.

Yes, this matters significantly — the EGR system was revised as part of the move to Euro 6 compliance, and a valve from a Euro 5 car may not be compatible with a Euro 6 engine even if the engine code looks similar. Euro 6 broadly came into force for new registrations from September 2015, so S-Class models registered before and after that point may have meaningfully different EGR components. Quote your registration and engine code to the breaker so they can identify the correct emissions-era part.

Trim level makes no difference to EGR valve fitment on the S-Class — SE, AMG Line, Executive, and other trim designations affect interior specification, wheels, and cosmetic features, none of which influence the exhaust gas recirculation system. What matters is the engine code and emissions era, not how the car is dressed. A used EGR valve from an SE-spec car will fit an AMG Line car of the same engine and year without any issue.

It is possible that engines sharing a code across Mercedes model lines use the same EGR valve, as Mercedes has used engines like the OM642 and OM651 across multiple platforms — but this is strong confirm-with-the-breaker territory, as mounting configurations, pipe connections, and software calibration can vary by application. Do not assume compatibility based on engine code alone when crossing model lines. Give the breaker both registrations and let them verify the part numbers match before you commit.

Both fall within the W221 generation (produced 2005–2013, with a facelift in 2009), so there is a reasonable chance of compatibility if the engine code is the same, but the 2009 facelift did bring some engineering updates and you should not assume all components carried over unchanged. Matching the engine code exactly is the most reliable starting point. Confirm with the breaker using both registration numbers to be sure you are getting the right part for your specific build.