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Halsten says to replace the EGR valve when it throws a P0401 (EGR Flow Insufficient) code, which usually doesn’t happen until after 100,000 miles. EGR COOLER ...
It’s tough to say which of several possible EGR fault codes was seen by your tech. Perhaps it was a P0401, insufficient EGR flow.
It’s tough to say which of several possible EGR fault codes was seen by your tech. Perhaps it was a P0401, insufficient EGR flow.