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Your 1994 dodge spirit check engine light - using on off method indicates codes 12 and 37 what could be wrong with it?

DTC 12 Coolant Temperature Sensor Input Circuit

Possible causes

* Coolant temperature sensor malfunction.

* Bad wiring harness to the coolant temperature sensor.

* Problem with the ECU.

DTC 37 Throttle Position Sensor Voltage Too Low

Possible causes:

* Throttle position sensor malfunction.

* Bad wiring harness to the throttle position sensor.

* Problem with the ECU.

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