2006 Honda Civic Suspect Digital Speedometer underestimated

2006 HONDA CIVIC
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JOSEPH SUIT
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Engine Performance problem
2006 Honda Civic 4 cyl Front Wheel Drive Automatic 67000K miles

Since last week, I can feel I was driving at a speed of around 60-70 km. but somehow the speedometer only moves between 40-50 km. This happened after I put a bottle of fuel injection cleaner along with a full tank of gas. Can u tell me if there is a defect on the speed sensor ? OR the fuel injection cleaner has caused the problem which will go away when I fill a next tank of gas?

ALSO, when I cold start each morning and back out from my garage, I press the brake and heard a light metal pressing noise (sometimes on the left front brake and sometimes at the rear brakes). the noise will go away after running for a distance. My mechanic checked all the brakes and found nothing wrong. He said most Honda Civic have these problem and quite normal.
Dec 6, 2008 at 10:26 AM
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F4I_GUY
  • ASE Certified Mechanic
  • 3,302 POSTS
  • ASE Certified Mechanic
Fuel injector cleaner or anything fuel related will affect your VSS reading. The fault is in the driveline (if there is a fault).

Do you have different sized wheels on by any chance? Check your door jam sticker, it will list a tire size then make sure you have that tire size on your vehicle. If you do not then your speedometer will be off.
Dec 6, 2008 at 12:38 PM
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