AutoCodes – Ford – P0109 1997 Ford F150

P0109 1997 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 1997 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.

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Code Popularity 3,006

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
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Code P0109 1997 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 1997 Ford F150 - BARO Sensor Circuit Intermittent - AutoCodes.com — P0109 1997 Ford F150 Code - BARO Sensor Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0109 1997 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 1997 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 1997 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 P0109 1997 Ford F150 Code

1. What are the common symptoms of OBDII code P0109 (BARO Sensor Circuit Intermittent) in a 1997 Ford F150?

- Common symptoms include rough idling, poor acceleration, decreased fuel efficiency, and potential stalling of the vehicle.

2. What causes the OBDII code P0109 to trigger in a 1997 Ford F150?

- The code P0109 is triggered when the BARO (barometric pressure) sensor circuit intermittently malfunctions, leading to inaccurate readings of the atmospheric pressure.

3. How can I diagnose the BARO sensor circuit issue in my 1997 Ford F150?

- You can diagnose the BARO sensor circuit issue by using an OBDII scanner to read the code, visually inspecting the sensor and its wiring for any damage, and performing a continuity test on the sensor circuit.

4. What are some repair tips for fixing the BARO sensor circuit intermittent issue in a 1997 Ford F150?

- Repair tips include checking and cleaning the sensor connections, replacing a faulty BARO sensor, inspecting and repairing any damaged wiring, and resetting the trouble code after the repairs are completed.

5. Can a dirty air filter cause the OBDII code P0109 to appear in a 1997 Ford F150?

- Yes, a dirty air filter can cause the BARO sensor to receive incorrect air pressure readings, which may trigger the code P0109. It is recommended to check and replace the air filter if necessary.

6. Will driving with the OBDII code P0109 illuminated harm my 1997 Ford F150?

- While driving with the code P0109 may not immediately harm your vehicle, it is recommended to address the issue promptly to prevent potential long-term damage to the engine and emissions system.

7. Are there any safety concerns associated with the OBDII code P0109 in a 1997 Ford F150?

- The main safety concern related to the code P0109 is the potential for the vehicle to stall unexpectedly, especially at low speeds or while idling, which can pose a safety risk in certain driving conditions.

8. Can I reset the OBDII code P0109 in my 1997 Ford F150 without making any repairs?

- While you can reset the trouble code using an OBDII scanner, it is recommended to diagnose and address the underlying issue causing the code to appear to prevent it from reoccurring in the future.

9. How much does it typically cost to repair the BARO sensor circuit issue triggering the OBDII code P0109 in a 1997 Ford F150?

- The cost of repairing the BARO sensor circuit issue can vary depending on the exact cause of the problem, but it typically ranges from $100 to $300 for parts and labor.

10. Is it possible to prevent the OBDII code P0109 from appearing in my 1997 Ford F150?

- Regular maintenance, such as replacing the air filter at recommended intervals, can help prevent issues with the BARO sensor circuit and reduce the likelihood of the code P0109 appearing.