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S9 - Check EGR Valve
- Check Exhaust Gas Recirculation (EGR) valve for housing leaks or EGR gasket blow-by. Service as necessary.
- Remove EGR valve and check for proper seating.
- Does EGR valve seat properly (fully closed)?
Yes -- Reconnect original EGR valve. Go to pinpoint test step H2. H2 - Check Fuel Pressure
No -- Reconnect original EGR valve. Refer to Emission Control Systems for EGR valve diagnosis.