I just bought a 1998 CL 2.3 Automatic. I was just driving it on a road I am familiar with and was in the right lane and noticed the Speedometer was saying I was doing almost 55, being familiar with this road I know there was no way I would be going that fast with people blowing by me on the left. I decided to check the speed using my GPS and at 50-52 mph I was going about 40. I found speedometer sensors on the internet for $85, but could the car have had its transmission replaced with one from a 3.0? I know most cars tend to be up to 4% off but this is about 25%. Has anyone else had this problem? Will the odometer read 25% off too or is it independent of the speedo? Thanks alot in advance for any info.

 

It is absolutely impossible and unnecessary to hook a 3.0 transmission to a 2.3 engine. Most likely it is your vehicle speed sensor (VSS) located on top of the transmission. Could also be a faulty gauge cluster. What size tires do you have on the car? That can drastically change your spedo accuracy too.

 

Great to hear there is no way a 3.0 trans could be put in to 2.3 car. The wheels and tires are stock. If it is the speed sensor it may not always trigger the check engine light?

 

It should trigger the CEL, but might not. Could be a faulty cluster then.