1994 Geo Prizm

1994 GEO PRIZM
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Electrical problem
1994 Geo Prizm 4 cyl Two Wheel Drive Manual

Light on (MIL) and code is 12 (engine speed sensor circuit). what damage represent this code in the engine function? where to locate the sensor?
Jul 27, 2010 at 8:30 AM
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MMPRINCE4000
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Code would disable cruise control.

Sensor is on transmission.
Jul 31, 2010 at 10:46 AM
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Thanks for your response.

Code 42 is vehicle speed sensor (Speedometer).
And code 12 is engine speed sensor circuit (RPM) signal. The OBD scan screen said.

What symptom represents this code in the engine function?
Where to locate the sensor?
Aug 1, 2010 at 1:42 PM
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MMPRINCE4000
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Sensor is near output shafts on tranny.
Aug 2, 2010 at 8:56 AM
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