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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
never heard of code 98, but if the TPS code is being tripped, more than likely the TPS needs replacing... thats whats tripping my CEL, i just dont have the extra cash to drop on a new sensor at the moment[]