Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2004FOCUS ZX5, 2.3 Z, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS - CNG, FLEX-FUEL & GASOLINEDIAGNOSTIC TROUBLE CODE (DTC) CHARTSP1290 - CYLINDER HEAD TEMPERATURE (CHT) SENSOR CIRCUIT LOW INPUT
2004 Ford Focus ZX5, 2.3 Z, Standard
P1290 - Cylinder Head Temperature (CHT) Sensor Circuit Low Input
2004 Ford Focus ZX5, 2.3 Z, StandardSECTION P1290 - Cylinder Head Temperature (CHT) Sensor Circuit Low Input
P1290 - CYLINDER HEAD TEMPERATURE (CHT) SENSOR CIRCUIT LOW INPUT
| Description: | Indicates a CHT sensor circuit malfunction (shorted). | ||
| Possible Causes: |
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| Diagnostic Aids: | A CHT V PID reading less than 0.2 volt with key ON and engine OFF or during any engine operating mode indicates a hard fault.
NOTE:
DTC P0117 may also be reported when this DTC is set. Either of these DTCs activate the MIL light.
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to DL: Cylinder Head Temperature (CHT) Sensor STEP 7 | GO to DL: Cylinder Head Temperature (CHT) Sensor STEP 7 | GO to DL: Cylinder Head Temperature (CHT) Sensor STEP 15 |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.