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DPFE with 2 rubber hoses. A sensor with only 1 hose is a PFE. Most '80-95 trucks had NEITHER; they use a sonic (EVP) EGR system.

For other TSBs, check here.
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TSB 88-26-06 PFE Moisture

Publication Date: DECEMBER 21, 1988

FORD: 1988-89 ESCORT, EXP, TEMPO, TAURUS, THUNDERBIRD
LINCOLN-MERCURY: 1988-89 TOPAZ, SABLE, COUGAR, CONTINENTAL
MERKUR: 1988-89 SCORPIO

ISSUE: The pressure feedback electronic (PFE) EGR transducer sensor changes an exhaust pressure signal into analog voltage. The EEC IV processor uses this to control EGR flow. Condensation (water) is a natural by-product of combustion and may collect in the PFE sensor port or the PFE sensor silicon hose. Water in the PFE sensor port or PFE hose does not indicate an abnormal operating condition or failed sensor. The water in the PFE sensor port or PFE hose will drain back into the EGR tube because of the downward slope of the hose. Refer to the application chart of this TSB article for the affected vehicles.

PFE SENSOR APPLICATION CHART
MODEL YEAR VEHICLE ENGINE REGION
1988-89 Escort-Exp 1.9L CFI 50 State
1988-89 Tempo/Topaz 2.3L HSC 50 State
1988-89 Thunderbird/Cougar 3.8L 50 State
1988-89 Taurus/Sable 3.0L California
1988-89 Taurus/Sable 3.8L 50 State
1988-89 Continental 3.8L 50 State
1988-89 Scorpio 2.9L 50 State

ACTION: Before replacing a PFE sensor for water in the sensor port or silicon tube, perform an EEC IV self test. If no service codes are found indicating a faulty PFE sensor, do not replace the sensor.

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: INFORMATION ONLY