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I have a 06 Honda civic and the speed miter is digital. My problem is that when I go 65 miles or more really reads 105 why is this happing ? Can I fix this
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More info needed. Is this a hatch back, sedan, or CRX? Is the odometer mechanical [old style] or digital [LCD numbers] The vehicle speed sensor [located behind the speedometer in the instrument cluster] drives both the speedometer and the odometer [mileage meter]. It sounds like an electric problem in the instrument cluster. Remove the instrument cluster and take it to your local speedometer repair shop. Look in the yellow pages for them. Or simply buy and install a used instrument cluster from a junk yard.
You can change it without a press if you absolutely have to, but I really strongly recommend that you take it to a machine shop and have it done right with a press. My local shop charges only $65 for the job.
Check the cables and connector for the speed sensor. It's located on the transmission towards the firewall. The connector has three pins on it. I just had to replace mine, went to the junkyard and paid $3 for the connector, because it was corroded. If the cables are clean and OK then replace the speed sensor. It ranges in price from $65 to $105.
First things I would look at is,did they put 10w30 oil in and not 5w20 or 0w20,it makes a difference in mileage (if they run out of the correct viscosity oil they WILL put in what they have).
Did the service include a spark plug change?Is the spark plug gap correct?
Did they do a brake service?Is a brake dragging,a little to tight?Did they clean the throttle body?Maybe the engine was running a little lean before and now is at the proper fuel mixture,with less MPGs but running clean at the exhaust.
Weather conditions?Head winds and colder temps reduce MPG.
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