P0118high severityPowertrain
ECT Sensor 1 Circuit High Input
on 2008 Mazda MX-5 Miata 2.0L I4 · RWD
What this code means
The ECT sensor voltage is higher than expected, indicating very low temperature or open circuit.
Symptoms
- Check Engine Light
- Rich running at operating temp
- Poor fuel economy
- Fans not coming on
Common causes
- Open circuit
- Disconnected sensor
- Faulty sensor
- Corroded connector
Diagnostic steps
- Test sensor resistance
- Check for open circuits
- Inspect connector
Repair notes
Repair open circuit or replace sensor. CAUTION: Engine may overheat if fans do not activate.
Other Powertrain codes on this vehicle
P0001
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P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1