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Gaseous exchange
Recently the emissions warning light came on in my 2005/55 Audi A4 TDI which has done 55,000 miles and always been serviced at my local Audi dealer. Upon inspection they said there is a leaking EGR valve and quoted £425 to repair.
The warning light was reset and apparently the car is safe to drive although the repair should be carried out asap. Can you please explain what this valve does and whether you think the cost is reasonable?
The warning light was reset and apparently the car is safe to drive although the repair should be carried out asap. Can you please explain what this valve does and whether you think the cost is reasonable?
Asked on 22 April 2011 by MK, Norwich
Answered by
Honest John
Exhaust Gas Recirculation is recirculation of combustion gases from the exhaust manifold so they are burned by the engine rather than emitted. The trouble is EGR valves get clogged with hydrocarbon tars. They can sometimes be cleaned up with solvents after removing them.
But a dealer regards this as too much trouble and simply replaces them. Renault’s answer in its new 1.6 DCI 130 engine is an EGR system that takes the gases from after the diesel particulate filter, cools them, then recirculates them through the intercooler making sure they are recombusted at the right temperature.
But a dealer regards this as too much trouble and simply replaces them. Renault’s answer in its new 1.6 DCI 130 engine is an EGR system that takes the gases from after the diesel particulate filter, cools them, then recirculates them through the intercooler making sure they are recombusted at the right temperature.
Tags:
technical issues
egr valves
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