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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

2000 Mercury Grand Marquis intermittent p0720 p0722 p0503

  • Joseperez
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5 years 3 weeks ago #43652 by Joseperez
2000 Mercury Grand Marquis intermittent p0720 p0722 p0503 was created by Joseperez
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

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5 years 3 weeks ago #43653 by Joseperez
Replied by Joseperez on topic 2000 Mercury Grand Marquis intermittent p0720 p0722 p0503
Have some good video footage I will post once I figure out how to

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  • Noah
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5 years 3 weeks ago #43665 by Noah
Replied by Noah on topic 2000 Mercury Grand Marquis intermittent p0720 p0722 p0503
You're going to have to post them to you tube or something and post the links here
"Ground cannot be checked with a 10mm socket"

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