engine light on

[Dirty325ix]

my check engine light is on and the stomp test says the coolant sensor is bad

is it the coolant sensor being bad that is causeing the check engine light

[jlevie]

That will cause the CEL to light up. The sensor could be bad, the connector bad, the input channel of the DME bad, or the engine harness could be bad. If this is a late (from 9/87) model 325i/is/ic, C191 under the intake could be the cause of the fault code. The diagnostic would be to check the resistance of the sensor.