What Are The Egr Valve And Mass Sensor And What Do They Do ?

[paulandlouise]

As my car is running really poor an IS250 auto I have noticed a number of people refering to cleaning of the egr valve and mass sensor - can anyone explain what these are and what problems can they cause,

thanks

[shazy]

EGR valve is found on diesel engines,

[C4MYC]

Your MAF, mass air flow sensor regulates the mixture of fuel and oxygen basically.

The EGR, exhaust gas recycle basically does what it says on the tin. Carbon builds up and chokes the exhaust and needs cleaning sometime.

That`s how I understand them to be anyway

Basically

[dgman]

egr valve recycles exhaust gas through to the inlet manifold and then into the engine to be burnt a second time in order to reduce pollution.the petrol engine will i think have a egr valve.egr's are more trouble on the diesels because it is a dirty fuel in comparison to petrol.egr is not a new idea,it has been around for many years.

still got my 220d,five year old next week with 77k covered.