I had the same problem with my 91GT. I put up with it for over a year and finally was sick of it, so I bought a new sensor through ford. Hasn't come on since.
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1991 Mustang GT Conv: 58,000 original miles, 2nd owner.
Engine: FMS 65mm tb/spacer, C&L 73mm maf, MAC cai.
Drivetrain: Built AOD w/ Edge 2800rpm lockup converter, hardened 3-4 inner shaft, Trans-Go shift kit, B&M supercooler, FMS 3.73 gears & aluminum d/s, rebuilt traction lock.
Exhaust: BBK unequal length shorty headers, BBK o/r h-pipe, Flowmaster 2 chamber mufflers.
Chassis/suspension/brakes: Kenny Brown supersubs.
The rest is stock.
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