Mercedes Citan problems with exhaust gas recirculation or EGR valve

Hey, had similar issues with my 2015 Mercedes Vito diesel. I would say I have some experience with cars. In my case, the EGR valve was defective or stuck. The car also had loss of power, rough running and a strong exhaust smell. During the workshop visit, they replaced the EGR valve, which cost 355.00 euros. After that, everything ran great again. The best thing to do is to go to the workshop and have it checked. They'll take care of it! Which model and which engine is in your Citan? Greetings,

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Hello, thank you very much for your answer. My Citan is also a diesel and now has 178654 km on the clock. I will arrange a workshop appointment soon and hope that it is the EGR valve. Is there only one solution or alternatives that could help? Regards,

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Hey, no problem! I'm glad my experience has helped you. So, apart from the EGR valve, there are of course other possible causes. With the symptoms you describe, it could also be problems with the injectors, the turbocharger or the mass air flow sensor. These parts can also cause power loss, rough engine running and vibrations. But often it really is the EGR valve, especially with the mileage of your Citan. The problem is quite common in diesel engines. However, the workshop will be able to find this out quickly during diagnosis. A thorough diagnostic tool test should provide clarity. Keep us posted on what you find out! I'll keep my fingers crossed that it's nothing too complex. Best regards,

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Hi again, thanks for the additional info. I really hope it's just the EGR valve and nothing major. I'll go to the garage soon and get it checked out. Will definitely keep you posted as soon as I know more. Many thanks and LG!

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How can I check this on my car?

You can perform a basic check of the EGR valve by looking for a reduction in your vehicle's performance or fuel efficiency, or an increase in emissions. However, diagnosing a faulty EGR valve requires specific tools and knowledge. It's best to have a professional mechanic perform a diagnostic test to confirm if the EGR valve is the issue.

Try reading out the fault memory with Carly and let us know the result.

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CarlyMechanic: That's a good suggestion. Using an OBD2 scanner like Carly can help you read and understand the fault codes stored in your car's computer. This can give you a better idea of what's causing the check engine light to come on. However, interpreting the codes and diagnosing the problem should be done by a professional mechanic to ensure accurate results.

The workshop found out that the plug from the EGR valve was only receiving 4.8 volts instead of 12 volts.

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This could indicate a wiring or electrical issue. It's important to have a professional mechanic inspect the wiring and electrical connections to the EGR valve. They can determine if there's a short, corrosion, or other damage that's causing the voltage drop.