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| Feature | Specification |
| Primary Part Number | MOTORCRAFT DY-579 |
| OEM Part Number | E8GY-9F472-A (Ford/Motorcraft) |
| Function | HEGO Sensor (Measures oxygen in exhaust for Electronic Fuel Injection feedback) |
| Voltage | 12 Volts (Heater Circuit) |
| Wire Count | 3 or 4-Wire (Typically 3-wire for this era) |
| Thread Size | M18 x 1.5 (Standard O2 Sensor Thread) |
| System Compatibility | Ford EEC-IV Electronic Engine Control |
| Construction | Ceramic/Zirconia Element with Stainless Steel Housing |
| Typical Use | Original Equipment (OE) Sensor for Upstream (Pre-catalytic converter) or Downstream position. |
| Vehicle/Truck | Years | Engine Type | Notes |
| Ford Mustang | 1988 - 1993 | V8 5.0L (302 CID) | Used on the popular 5.0L High Output (HO) engine. |
| Ford Mustang | 1988 - 1993 | I4 2.3L | Used on the base 4-cylinder engine models. |
| Ford LTD/Crown Victoria | 1988 - 1991 | V8 5.0L (302 CID) | Used on the full-size platform. |
| Ford Trucks (F-Series) | 1988 - 1991 | V8 5.0L, V8 5.8L, I6 4.9L | Used on various F-150, F-250, and F-350 EFI truck engines. |
| Ford Bronco (Full Size) | 1988 - 1991 | V8 5.0L, V8 5.8L, I6 4.9L | Used on the full-size Bronco models. |
| Mercury Cougar | 1988 - 1990 | V8 5.0L, V6 3.8L | Used on the mid-size coupe models. |
