P1117 1999 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 1999 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 1999 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 1999 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 1999 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 1999 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 1999 Ford F150 Code
What does the OBDII code P1117 mean for a 1999 Ford F150?
The P1117 code indicates an intermittent issue with the Engine Coolant Temperature (ECT) sensor, meaning the sensor is not providing consistent readings to the engine control module (ECM).
What are the common symptoms of the P1117 code?
Symptoms may include erratic temperature gauge readings, poor engine performance, reduced fuel efficiency, and potential overheating.
What causes the P1117 code to appear?
The code can be triggered by a faulty ECT sensor, damaged wiring or connectors, corrosion at the sensor connection, or issues with the ECM.
How can I diagnose the P1117 code on my 1999 Ford F150?
Start by visually inspecting the ECT sensor, its wiring, and connectors for damage or corrosion. Use a multimeter to check the sensor's resistance and verify proper voltage supply.
Can I drive my 1999 Ford F150 with the P1117 code?
Driving with this code is not recommended as it can lead to inaccurate temperature readings, overheating, and potential engine damage.
How do I fix the P1117 code?
Repairs may include replacing the ECT sensor, repairing or replacing damaged wiring or connectors, cleaning corroded connections, or reprogramming the ECM if necessary.
Where is the Engine Coolant Temperature (ECT) sensor located on a 1999 Ford F150?
The ECT sensor is typically located near the thermostat housing, where the upper radiator hose connects to the engine.
How much does it cost to fix the P1117 code?
The repair cost depends on the issue. Replacing the ECT sensor typically costs $50-$150, while wiring repairs or ECM reprogramming may cost more.
What tools do I need to replace the ECT sensor?
You’ll need a socket wrench, a replacement ECT sensor, and possibly a multimeter to check connections and resistance.
Can a failing ECT sensor damage my engine?
Yes, a failing ECT sensor can cause incorrect temperature readings, leading to overheating or improper air-fuel mixture, which can damage the engine over time.
Discuss the causes and fixes for P1117 1999 Ford F150 OBDII Code
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