| On our cars, it's called the check engine light. It's really the O2 sensor change light. The light, coupled with the duty cycle on the X11 connector, will tell if the ECU is bad.
I've been through this with my 420SEL. I'm getting a replacement ECU soon.
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Near Manassas Va. '89 300SE, 2002 Ford Crown Victoria Police Interceptor, 89 420SEL
Had '65 220SE, 67 230S, 72 280SE 4.5 Dad had '65 300SE LWB, '65 220SE
"Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive." C.S. Lewis
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