1995 Sonoma P/U 2WD EGR Valve Technical Service Bulletins - Page 4241
EGR Valve: Application and ID
EGR Valve ID
Linear EGR Valve Markings
Linear EGR Label Location
EGR VALVE IDENTIFICATION
1. Positive backpressure EGR valves will have a "P" stamped on the top side of the valve after the part number should not be used.
2. Negative backpressure EGR valves will have a "N" stamped on the top side of the valve after the part number.
3. Port EGR valves have no identification stamped after the part number.
4. Linear EGR valves look like a small motor.