Used Mercedes-Benz ML EGR Valve

EGR valves exist on the diesel variants of the Mercedes ML, which made up the vast majority of UK sales — engines such as the 320 CDI, 280 CDI, 350 CDI, and later BlueTEC units all use EGR systems. The petrol-engined ML models (such as the ML350 petrol and ML500) are naturally aspirated or lightly boosted petrols that in most cases did not use EGR in the same way, so if you have a petrol ML you are unlikely to need this part. If you are unsure which engine you have, check your V5C or confirm with the breaker quoting your registration.

The W163 (1998–2005) and the W164 (2005–2011) are entirely different generations with different engine families, so their EGR valves are not interchangeable. The W164 introduced updated CDI engines with revised emissions equipment aligned to Euro 4 and later Euro 5 standards, making the parts dimensionally and electronically different. Always quote your generation and engine code to the breaker rather than assuming any diesel ML EGR valve will swap across.

Both the 2008 and 2011 ML fall within the W164 generation (2005–2011), but you need to match the engine code carefully because Mercedes updated CDI engine variants across this period to meet tightening emissions standards. A part from the same engine code within the W164 range is far more likely to interchange than one from a different engine variant, even within the same generation. Give the breaker your engine code — found on the V5C or stamped in the engine bay — alongside your registration to confirm.

The 2012 ML350 CDI sits in the W166 generation (2011–2015), which replaced the W164, and it uses a different BlueTEC engine family meeting Euro 5 requirements. An EGR valve from a W164 ML is from the previous generation and a different emissions era, so it is very unlikely to be compatible. Stick to W166-sourced parts matched to your specific engine code, and confirm with the breaker against your registration before buying.

Trim level has no effect on the EGR valve fitted — whether your ML is an SE, Sport, or AMG Line, the EGR valve is determined entirely by the engine code and model year. You may find minor cosmetic differences around the engine bay between build dates, but the EGR valve itself is the same across trims sharing the same engine. Focus on matching engine code and generation rather than trim when speaking to a breaker.

The presence of a DPF indicates your ML is running a later emissions-spec engine, typically Euro 4 or Euro 5, and the EGR system on these units is calibrated to work alongside the DPF regeneration cycle. Fitting an EGR valve from an earlier, non-DPF era engine could affect how the system manages exhaust gas recirculation and may cause running issues or MOT failure. This is strong confirm-with-breaker territory — give them your registration and engine code so they can match the correct emissions-era part.