Acronym for the Exhaust Gas Recirculation valve. It is a smog device which diverts spent exhaust gases back into the intake tract to help limit temperatures in the combustion chamber. The main purpose was to help reduce NOx emissions.

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VW Golf 2001 Mk4 Diesel ASR Engine Problem

I've spent a crazy amount of money on my car lately and I still have the same problem. I've replaced the: Catalyst Converter Radiator Starter Motor EGR Valve Track Rod ends & Wheel Bearings ...