Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 120 (ENGINE CONTROLS - THEORY & OPERATION - EEC-IV 2.3L)COMPUTERIZED ENGINE CONTROLSINPUT DEVICESPRESSURE FEEDBACK EGR (PFE) SENSOR
1991 Mercury Tracer Base, 4D Sedan, Automatic
Pressure Feedback EGR (PFE) Sensor
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Pressure Feedback EGR (PFE) Sensor
WARNING: This page is about a different car, the 1994 Mercury Topaz and 1994 Ford Tempo. However, it is still accessible from the selected car via links, so may be relevant.
PFE sensor monitors exhaust system and generates a varying electrical signal proportionate to exhaust pressure. This signal is sent to the PCM where it is translated and used to compute correct EGR flow.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.