AutoCodes – Ford – P0117 1998 Ford F150

P0117 1998 Ford F150 Code - Engine Coolant Temperature Sensor Circuit Low

Quick Answer

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. Common causes include Low engine coolant level, Faulty engine coolant thermostat, Faulty Engine Coolant Temperature (ECT) Sensor or Cylinder Head Temperature (CHT) Sensor. 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: P0117 1998 Ford F150 indicates Engine Coolant Temperature Sensor Circuit Low.
Common causes: Common causes include Low engine coolant level, Faulty engine coolant thermostat, Faulty Engine Coolant Temperature (ECT) Sensor or Cylinder Head Temperature (CHT) Sensor.
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 Popularity 5,088

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 02, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0117 1998 Ford F150 Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Powertrain Control Module (PCM). The modified signal returns to the PCM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. The Diagnostic Trouble Code (DTC) indicates the sensor signal is greater than the self-test maximum. The ECT sensor minimum is 0.2 volts or 121°C (250°F).

OBDII Code P0117 1998 Ford F150 - Engine Coolant Temperature Sensor Circuit Low - AutoCodes.com — P0117 1998 Ford F150 Code - Engine Coolant Temperature Sensor Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0117 1998 Ford F150?

Low engine coolant level
Faulty engine coolant thermostat
Faulty Engine Coolant Temperature (ECT) Sensor or Cylinder Head Temperature (CHT) Sensor
Engine Coolant Temperature Sensor or Cylinder Head Temperature Sensor harness is open or shorted
Engine Coolant Temperature Sensor or Cylinder Head Temperature Sensor circuit poor electrical connection

How to Fix the DTC P0117 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.

What does this mean?

Code Tech Notes

Start by checking for coolant leaks, and if there are no leaks, the thermostat might be stuck closed and needs replacement. If the problem persists, change the Engine Coolant Temperature (ECT) sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0117 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0117 1998 Ford F150 Code

1. What are the common symptoms of OBDII code P0117 in a 1998 Ford F150?

- Common symptoms include issues with the engine temperature gauge, poor fuel economy, rough idling, and potentially engine overheating.

2. What causes the OBDII code P0117 in a 1998 Ford F150?

- The code is typically triggered when the Engine Coolant Temperature (ECT) sensor circuit reports a low voltage signal, which can be caused by a faulty ECT sensor, wiring issues, or a bad connection.

3. How can I diagnose the cause of OBDII code P0117 in my 1998 Ford F150?

- To diagnose the issue, you can use a multimeter to test the ECT sensor's resistance, check the wiring for any damage, and verify the sensor's connection to the vehicle's computer.

4. Can I still drive my 1998 Ford F150 with OBDII code P0117 active?

- It is not recommended to drive your vehicle with the code active, as it can lead to poor engine performance, potential overheating, and other issues. It's best to address the problem promptly.

5. How can I repair OBDII code P0117 in my 1998 Ford F150?

- The most common repair involves replacing the Engine Coolant Temperature sensor. Ensure you use a compatible sensor and follow proper installation procedures.

6. Are there any DIY tips for fixing OBDII code P0117 in a 1998 Ford F150?

- If you have some experience working on vehicles, you can attempt to replace the ECT sensor yourself using basic tools. However, if you're unsure, it's best to consult a professional mechanic.

7. Will resetting the OBDII codes make OBDII code P0117 go away in my 1998 Ford F150?

- Resetting the codes may clear the warning temporarily, but if the underlying issue causing P0117 is not addressed, the code is likely to return once the vehicle is driven again.

8. How much does it cost to fix OBDII code P0117 in a 1998 Ford F150 at a repair shop?

- The cost can vary depending on your location and the shop's rates, but expect to pay for the ECT sensor itself and labor costs for diagnosis and replacement, which can range from $100 to $300 or more.

9. Can a bad thermostat cause OBDII code P0117 in a 1998 Ford F150?

- While a faulty thermostat can impact engine temperature, it is not typically the direct cause of P0117. Focus on checking and potentially replacing the Engine Coolant Temperature sensor.

10. Will OBDII code P0117 cause my 1998 Ford F150 to fail an emissions test?

- Yes, having active OBDII codes, including P0117, can result in a failed emissions test. It's essential to address and resolve the issue before attempting to pass an emissions inspection.