P1117 1998 Ford F150 Code - Engine Coolant Temperature Sensor Intermittent
Quick Answer
The Engine Coolant Temperature (ECT) Sensor is a thermistor device in which resistance changes with temperature. Common causes include Low Engine Coolant Level, Faulty Engine Coolant Temperature (ECT) sensor, Engine Coolant Temperature (ECT) sensor harness is open or shorted. 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
- P1117 1998 Ford F150 indicates Engine Coolant Temperature Sensor Intermittent.
- Common causes
- Common causes include Low Engine Coolant Level, Faulty Engine Coolant Temperature (ECT) sensor, Engine Coolant Temperature (ECT) sensor harness is open or shorted.
- 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.
Code P1117 1998 Ford F150 Description
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so varying the resistance of the passive sensor causes a variation in total current flow. Voltage that is dropped across a fixed resistor (pull-up resister) in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The ECT measures the temperature of the engine coolant. The PCM uses the ECT input for fuel control and for cooling fan control. There are 3 types of ECT sensors; threaded, push-in, and twist-lock. The ECT sensor is located in an engine coolant passage.
What are the Possible Causes of the DTC P1117 1998 Ford F150?
- Low Engine Coolant Level
- Faulty Engine Coolant Temperature (ECT) sensor
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
- Faulty Engine Coolant Thermostat
- Damaged Powertrain Control Module (PCM)
How to Fix the DTC P1117 1998 Ford F150?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1117 1998 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1117 1998 Ford F150 Code
What does the OBDII code P1117 mean on a 1998 Ford F150?
P1117 indicates an intermittent issue with the Engine Coolant Temperature (ECT) sensor, which monitors the engine’s coolant temperature and sends data to the powertrain control module (PCM).
What are the common symptoms of the P1117 code?
Symptoms may include poor fuel efficiency, rough idling, difficulty starting the engine, erratic temperature gauge readings, or the Check Engine Light turning on.
What causes the P1117 code to appear?
Common causes include a faulty ECT sensor, damaged wiring or connectors, corrosion at the sensor connections, or a malfunctioning PCM.
Can I keep driving my Ford F150 with the P1117 code?
While the truck may still be driveable, the intermittent ECT sensor issue can cause poor performance and lead to potential overheating. It’s best to address the problem promptly.
How do I diagnose the P1117 code?
Check the ECT sensor and its wiring for damage, corrosion, or loose connections. Use a multimeter to test the sensor’s resistance and ensure it matches factory specifications.
How do I fix the P1117 code on my 1998 Ford F150?
Repairs may include replacing the ECT sensor, repairing or replacing damaged wiring or connectors, and clearing the code with an OBDII scanner after addressing the issue.
How much does it cost to fix the P1117 code?
Replacing the ECT sensor typically costs $50-$150, depending on the part and labor rates. Wiring repairs or diagnostics may add to the cost.
Can a dirty coolant system cause the P1117 code?
Yes, contaminated or low coolant can affect temperature readings and sensor performance, potentially triggering the P1117 code.
What tools are needed to troubleshoot the P1117 code?
You’ll need an OBDII scanner, a multimeter to test the sensor, and basic tools like pliers and screwdrivers to inspect and replace the ECT sensor or wiring.
Does clearing the P1117 code with a scanner fix the issue?
No, clearing the code only resets the Check Engine Light. The underlying issue with the ECT sensor or wiring must be resolved to prevent the code from returning.
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