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2000 Mercury Grand Marquis intermittent p0720 p0722 p0503
2000 Mercury Grand Marquis intermittently looses both vehicle speed sensor and output speed sensor codes come up as p0722 p0720 p0503 both sensors are reluctor type hooked up oscilloscope to each sensor at the ecu and it’s ground no drop out but looses scan data on the scanner after that test got the ecu refurbished still same thing sent it back was tested good got another ecu from a salvage yard program it and same thing have tested alternator many time on different testers and still test good (was thinking possible open diode) I’m running out of direction please help
