Put Ford wheels on and had to use 1/4 in. spacers, now ABS , traction and other dash lights come on and off . Did this customizing cause this problem ?
What is your question?
problem occurs sometime while driving
What makes this problem better or worse?
intermittent hard to tell
How long has your 2003 Mercury Grand Marquis had this problem?
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Yes, if you change the geometry like this, you will get faults and failures.
Stick with original tire and wheel sizes - exactly - for proper operation of your vehicle.