The engine service light has come on saying check emissions and I have been told it could be the egr valve or the lambda sensor, thought I might remove and clean the egr valve first, problem is I'm not sure where it is. Anyone got a clue?
Exhaust Gas Recirculation
EGR is a NOx (nitrogen oxide and nitrogen dioxide) reduction technique used in most gasoline and diesel engines.
EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. Intermixing the incoming air with recirculated exhaust gas dilutes the mix with inert gas, lowering the adiabatic flame temperature and (in diesel engines) reducing the amount of excess oxygen. The exhaust gas also increases the specific heat capacity of the mix lowering the peak combustion temperature. Because NOx formation progresses much faster at high temperatures, EGR serves to limit the generation of NOx. NOx is primarily formed when a mix of nitrogen and oxygen is subjected to high temperatures.
Currently in malc-b's garage: 2005 renault scenic II (privilege) 1.9 DCI
Your engine should look more like the photos once you take off the grey plastic cover over the top of it, I hope! Three bolts which may be under round plastic covers (unless they've been lost): the covers just pop out to reveal the bolt heads.
Currently in Rex4's garage: 2005/05 Laguna II (facelift) 1.9dCi 120; 2002/52 Scenic RX4 1.9dCi
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