AutoCodesFord – P1289 1998 Ford F150

P1289 1998 Ford F150 Code - Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range

Quick Answer

The Cylinder Head Temperature (CHT) Sensor is mounted into the wall of the cylinder head and is not connected to any coolant passages. Common causes include Wrong thermostat, Engine overheated, Low engine coolant level. 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
P1289 1998 Ford F150 indicates Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range.
Common causes
Common causes include Wrong thermostat, Engine overheated, Low engine coolant level.
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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 3,949
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Aug 07, 2019
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Code P1289 1998 Ford F150 Description

The Cylinder Head Temperature (CHT) Sensor is mounted into the wall of the cylinder head and is not connected to any coolant passages. The CHT sends a signal to the Powertrain Control Module (PCM) indicating the cylinder head temperature. If the temperature exceeds 126°C (-258°F), the PCM disables four fuel injectors at a time. The PCM will alternate which four injectors are disabled every 32 engine cycles. The four cylinders that are not being fuel injected act as air pumps to aid in cooling the engine. If the temperature exceeds 154 °C (310°F), the PCM disables all of the fuel injectors until the engine temperature drops below 154°C (310°F).
OBDII Code P1289 1998 Ford F150 - Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range - AutoCodes.com
P1289 1998 Ford F150 Code - Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range

What are the Possible Causes of the DTC P1289 1998 Ford F150?

  • Wrong thermostat
  • Engine overheated
  • Low engine coolant level
  • Faulty Cylinder Head Temperature (CHT) sensor
  • Cylinder Head Temperature (CHT) sensor harness is open or shorted
  • Cylinder Head Temperature (CHT) sensor circuit poor electrical connection

How to Fix the DTC P1289 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 P1289 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.

Need more information about the P1289 1998 Ford F150 code?

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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 P1289 1998 Ford F150 Code

1. What are the common symptoms of OBDII code P1289 in a 1998 Ford F150?

The common symptoms of OBDII code P1289 in a 1998 Ford F150 include engine overheating, rough idling, poor fuel efficiency, and potential stalling.

2. What could cause the OBDII code P1289 in a 1998 Ford F150?

The OBDII code P1289 in a 1998 Ford F150 is typically caused by a faulty cylinder head temperature sensor or issues with the sensor circuit, such as wiring problems or a poor connection.

3. How can I diagnose the OBDII code P1289 in my 1998 Ford F150?

To diagnose the OBDII code P1289 in a 1998 Ford F150, you can use an OBDII scanner to retrieve the fault code and then inspect the cylinder head temperature sensor and its wiring for any visible damage or issues.

4. Can I still drive my 1998 Ford F150 with the OBDII code P1289?

It is not recommended to drive your 1998 Ford F150 with the OBDII code P1289, as it can lead to engine overheating and potential damage. It's best to address the issue promptly to prevent further problems.

5. How do I repair the OBDII code P1289 in my 1998 Ford F150?

To repair the OBDII code P1289 in a 1998 Ford F150, you may need to replace the faulty cylinder head temperature sensor or repair any wiring issues. It's advisable to consult a professional mechanic for an accurate diagnosis and repair.

6. Is it safe to reset the OBDII code P1289 in my 1998 Ford F150 without fixing the issue?

Resetting the OBDII code P1289 in a 1998 Ford F150 without addressing the underlying problem is not recommended, as the issue will likely resurface. It's important to fix the root cause of the code to ensure proper vehicle operation.

7. Can a DIY enthusiast fix the OBDII code P1289 in a 1998 Ford F150?

While some DIY enthusiasts may have the skills to address the OBDII code P1289 in a 1998 Ford F150 by replacing the cylinder head temperature sensor or checking the wiring, it's always best to seek professional help for accurate diagnosis and repair.

8. How much does it cost to repair the OBDII code P1289 in a 1998 Ford F150?

The cost to repair the OBDII code P1289 in a 1998 Ford F150 can vary depending on the exact cause of the issue, the cost of parts, and the labor rates of the repair shop. It's advisable to get a few quotes from different mechanics to compare prices.

9. Will fixing the OBDII code P1289 improve the performance of my 1998 Ford F150?

Fixing the OBDII code P1289 in a 1998 Ford F150 can help improve the vehicle's performance by resolving issues related to engine temperature monitoring and combustion efficiency. It can also prevent potential engine damage in the long run.

10. How often does the OBDII code P1289 occur in a 1998 Ford F150?

The OBDII code P1289, indicating an out-of-range signal from the cylinder head temperature sensor, may occur sporadically in a 1998 Ford F150 due to sensor failures or wiring problems. Regular maintenance and inspections can help catch and address this issue early.

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