A friend's 2010 Civic's speedometer is massively inaccurate, showing too high, by anywhere from 20 to 55 mph. I'm failing to find info because every search result is about typical small inaccuracy. I thought maybe a wheel sensor or related braking/traction component and had her have a parts store pull codes - there are none. Any ideas?
Does she have it set to kph instead of mph?
In reply to Run_Away :
Hmm. After I posted, she gave me different speed comparisons - I think you're right! Thank you!
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