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You have a 91 Chevy lumina as it has on the manifold something that look like a spark plug but it is not as what is this and what does it do when the car is running or driving it?
Wiki User
∙ 18y ago
I believe you are seeing your Oxygen or 'O2' sensor. It measures the ratio of oxygen in the exhaust and sends the info to your car's computer while you are driving. If the O2 sensor is bad your car can run poorly. It is one of the more important sensors on you car.
Wiki User
∙ 18y ago
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