Mazda CX-8 2023 Problems

The sluggish performance and the erratic tachometer needle may not be related at all. That said, they could very well both be symptoms of the same problem. A lot of mechanics, when shown an erratic dashboard gauge, will start by checking for a bad earth point. A poor earth can lead to all sorts of problems, as a healthy flow of electricity is vital to the basic functions of any modern car.

But before you rush out to find an auto electrician, bear in mind that this sounds very much like a problem that would be covered by Mazda’s factory warranty. Provided you have had the car serviced correctly and it hasn’t been submerged in a flood or something equally drastic, the first step is to take it back to Mazda and allow the dealer to tackle the problem.