AutoCodes – Ford – P0109 1998 Ford F150

P0109 1998 Ford F150 Code - BARO Sensor Circuit Intermittent

Quick Answer

The Manifold Absolute Pressure (MAP) sensor measures the pressure inside the intake manifold. Common causes include Faulty Manifold Absolute Pressure (MAP) Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure Sensor circuit poor electrical connection. 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: P0109 1998 Ford F150 indicates BARO Sensor Circuit Intermittent .
Common causes: Common causes include Faulty Manifold Absolute Pressure (MAP) Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure Sensor circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,717

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 May 20, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0109 1998 Ford F150 Description

The Manifold Absolute Pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by engine speed, throttle opening, air temperature, Barometric Pressure (BARO) and if equipped, turbocharger output. A diaphragm within the MAP sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance.
The MAP sensor wiring includes 3 circuits. The Engine Control Module (ECM) supplies a regulated 5 volts to the sensor on a 5 V reference circuit. The ECM supplies ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.
Under normal operation the greatest pressure that can exist in the intake manifold is at ignition ON, engine OFF, which is equal to the BARO. The lowest manifold pressure occurs when the vehicle is idling or decelerating. The ECM monitors the MAP sensor signal for pressure outside of the normal range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the MAP Sensor voltage is failing intermittently.

OBDII Code P0109 1998 Ford F150 - BARO Sensor Circuit Intermittent - AutoCodes.com — P0109 1998 Ford F150 Code - BARO Sensor Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0109 1998 Ford F150?

Faulty Manifold Absolute Pressure (MAP) Sensor
Manifold Absolute Pressure Sensor harness is open or shorted
Manifold Absolute Pressure Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0109 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

The sensor signal to the PCM is failing intermittently.
Check harness and connection.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0109 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 P0109 1998 Ford F150 code?

Need more information on how to fix the P0109 1998 Ford F150 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0109 1998 Ford F150 code diagnosed by a professional: Find a repair shop in your area

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 P0109 1998 Ford F150 Code

1. What are common symptoms of OBDII code P0109 in a 1998 Ford F150 related to the BARO Sensor Circuit Intermittent?

The common symptoms include poor engine performance, rough idling, stalling, and decreased fuel efficiency.

2. What could be the possible causes of OBDII code P0109 in a 1998 Ford F150 indicating an intermittent BARO Sensor Circuit issue?

Possible causes include a faulty BARO sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).

3. How can I diagnose the BARO Sensor Circuit Intermittent issue causing OBDII code P0109 in my 1998 Ford F150?

You can diagnose the issue by checking the BARO sensor for proper operation, inspecting the wiring and connectors for any damage, and using a scan tool to monitor sensor readings.

4. Is it safe to continue driving my 1998 Ford F150 with OBDII code P0109 due to a BARO Sensor Circuit Intermittent problem?

It is not recommended to continue driving the vehicle with this code as it can lead to further engine damage and potential safety hazards.

5. How can I repair the BARO Sensor Circuit Intermittent problem triggering OBDII code P0109 in my 1998 Ford F150?

Repair options may include replacing the BARO sensor, repairing or replacing damaged wiring or connectors, and resetting the ECM to clear the code.

6. Can a DIY enthusiast fix the OBDII code P0109 related to the BARO Sensor Circuit Intermittent issue in a 1998 Ford F150?

While some DIY enthusiasts may be able to address the problem by replacing the BARO sensor or checking wiring connections, it is recommended to consult a professional mechanic for an accurate diagnosis and repair.

7. How much does it typically cost to repair the BARO Sensor Circuit Intermittent issue causing OBDII code P0109 in a 1998 Ford F150?

The cost of repair can vary depending on the root cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can a faulty BARO sensor cause other OBDII codes to appear in addition to P0109 on a 1998 Ford F150?

Yes, a faulty BARO sensor can cause other related OBDII codes to appear, such as P0107 (BARO Sensor Low) or P0108 (BARO Sensor High), indicating different sensor malfunctions.

9. How important is the BARO sensor in the overall performance of a 1998 Ford F150 affected by OBDII code P0109?

The BARO sensor plays a crucial role in providing accurate air pressure data to the ECM, which in turn affects fuel delivery and engine performance, making it essential for proper vehicle operation.

10. Are there any preventive maintenance measures I can take to avoid encountering OBDII code P0109 due to a BARO Sensor Circuit Intermittent issue in my 1998 Ford F150?

Regularly inspecting and cleaning the BARO sensor, checking for damaged wiring, and addressing any issues promptly can help prevent the occurrence of this code.