Mercedes-Benz W639 EGR valve stuck
Viano 2.2 CDIVito 111 CDIViano
The engine service light is on in my W639 and it won't rev above 3000 rpm - could the EGR valve be the cause?
It could. Fault code 2511-011 indicates that the EGR actuator (Y27) is not working properly. One cause is a stuck EGR valve. Read the fault codes first and do not guess the fault from the symptom.
How do I know if the EGR valve on my W639 is stuck?
The valve stem should move freely and return under spring force. If the stem is sticky or stays stuck, the valve is stuck and it can cause a fault code and power limitation.
Does cleaning a stuck EGR valve help, or must it be replaced?
Dissolving the deposits, cleaning and lubricating the stem has fixed the fault in some cars. Sometimes the symptom has returned later, and in the end some valves have had to be replaced. If cleaning does not help for long, replace the valve.
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