P128A Ford Code - Cylinder Head Temperature Sensor Circuit Intermittent/Erratic
Quick Answer
The P128A Ford diagnostic trouble code (DTC) refers to an issue with the Cylinder Head Temperature (CHT) sensor circuit, specifically indicating an intermittent or erratic signal. Common causes include Faulty Cylinder Head Temperature (CHT) sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning Engine Control Unit (ECU). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P128A Ford indicates Cylinder Head Temperature Sensor Circuit Intermittent/Erratic.
- Common causes
- Common causes include Faulty Cylinder Head Temperature (CHT) sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning Engine Control Unit (ECU).
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P128A Ford Description
The P128A Ford diagnostic trouble code (DTC) refers to an issue with the Cylinder Head Temperature (CHT) sensor circuit, specifically indicating an intermittent or erratic signal. The CHT sensor is a crucial component in the engine management system, responsible for monitoring the temperature of the cylinder head. This information is vital for the engine control unit (ECU) to adjust fuel delivery, ignition timing, and other parameters to ensure optimal performance and efficiency.
Common Causes of P128A Ford
- Faulty Cylinder Head Temperature (CHT) sensor
- Damaged wiring or connectors in the sensor circuit
- Malfunctioning Engine Control Unit (ECU)
- Environmental factors such as moisture or corrosion
- Excessive heat exposure causing sensor malfunction
Symptoms of P128A Ford
- Rough idling or engine stalling
- Decreased fuel efficiency
- Engine misfires
- Illumination of the check engine light
- Inconsistent temperature readings on the dashboard gauge
How to Fix P128A Ford
- Begin by diagnosing the issue using a scan tool to confirm the P128A code and check for any related codes.
- Inspect the CHT sensor, wiring, and connectors for any visible damage or corrosion.
- Test the CHT sensor using a multimeter to verify its functionality and resistance values.
- Replace the faulty CHT sensor if necessary and ensure all wiring and connectors are in good condition.
- Clear the DTC and perform a test drive to confirm that the issue has been resolved.
Cost to Fix P128A Ford
The typical repair costs for addressing a P128A Ford code can vary depending on the specific cause of the issue. Generally, the cost of a new CHT sensor ranges from $50 to $100, while labor costs for diagnosis and replacement can add another $100 to $200. Overall, the total repair cost for this issue may range from $150 to $300. However, it's essential to note that labor rates at auto repair shops can vary significantly, so it's advisable to check with local shops for a more accurate estimate.
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