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2004 kia optima. Tachometer not working. Engine check light on

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There are 2 sensors on the engine that sent a signal to the computer and speedometer and tachometer. When one of these goes bad it can make the speedometer and tachometer go all over the place and also just stop working. This can also cause all types of engine running problems because the information is sent to the PCM will be incorrect all so. The units are easy to replace once you find them, it seems that they are located in different areas of the engine with each year the vehicle was put out. Your local dealer should be able to tell you the location of each sending unit.

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Posted on Sep 29, 2010


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