EGR System, California - Description and Operation: Overview
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Bulletin No. 133
Date: January, 1984
Subject: 1984 CALIFORNIA EGR SYSTEM
In order to comply with the 1984 California emission standards, the Peugeot 505 Turbo Diesels are equipped with an electronically controlled EGR system.
The Federal (49 State) models (505 and 604) retain the pneumatically controlled EGR system as in 1983 model year.