Hi guys,

My lancer's speedometer and odometer has been malfunctioning for a long time. I called up a Mits dealer and one of their technicians told me that it could be due to the wrong spark plugs. A common problem was the replacement of spark plugs using spark plugs without resistors (without the "R").

I don't see the logic behind this. What are the spark plug resistors for? Can they really affect my speedometer/odometer? How do we determine if the sparkplugs we are using has resistors or not?

Thank you.