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According to the manufacturer, the 2012 VW Jetta TDI is equipped with an EGR valve, which is located on the rear left cylinder head and connects to the intake manifold. The EGR valve helps control nitrous emissions by recirculating exhaust gas, reducing oxygen levels in the combustion chamber. These valves can be cleaned instead of replaced if they are just dirty. Replacing an EGR valve can cost between $30 and $60, depending on whether it is an OEM or aftermarket part.
Where is the EGR valve situated on a Volkswagen Jetta?
For the 2012 VW Jetta TDI, you can find the EGR valve positioned between the exhaust and intake manifolds.