AutoCodes – Ford – P0068 1999 Ford F150

P0068 1999 Ford F150 Code - Manifold Absolute Pressure/Mass Air Flow Sensor - Throttle Position Correlation

Quick Answer

The Powertrain Control Module (PCM) monitors a vehicle operation rationality check by comparing Throttle Position (TP) to Mass Air Flow (MAF) readings. Common causes include Faulty Mass Air Flow (MAF) sensor, Large vacuum leak, Leaking air duct system. 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: P0068 1999 Ford F150 indicates Manifold Absolute Pressure/Mass Air Flow Sensor - Throttle Position Correlation.
Common causes: Common causes include Faulty Mass Air Flow (MAF) sensor, Large vacuum leak, Leaking air duct system.
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 4,729

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0068 1999 Ford F150 Description

The Powertrain Control Module (PCM) monitors a vehicle operation rationality check by comparing Throttle Position (TP) to Mass Air Flow (MAF) readings. If, during a self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.

OBDII Code P0068 1999 Ford F150 - Manifold Absolute Pressure/Mass Air Flow Sensor - Throttle Position Correlation - AutoCodes.com — P0068 1999 Ford F150 Code - Manifold Absolute Pressure/Mass Air Flow Sensor - Throttle Position Correlation

What does this mean?

What are the Possible Causes of the DTC P0068 1999 Ford F150?

Faulty Mass Air Flow (MAF) sensor
Large vacuum leak
Leaking air duct system
Mass Air Flow (MAF) poor electrical connection
Manifold Absolute Pressure (MAP) poor electrical connection
Faulty Manifold Absolute Pressure (MAP) sensor
TP sensor not seated properly
Faulty Throttle Position (TP) sensor

How to Fix the DTC P0068 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.

What does this mean?

Code Tech Notes

Drive vehicle and exercise throttle and TP sensor in all gears. A TPNS PID less than 4.82% (0.24 volt) with a LOAD PID greater than 55% or a TPB V PID greater than 49.06% (2.44 volts) with a LOAD PID less than 30% indicates a hard fault

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0068 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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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 P0068 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P0068 in a 1999 Ford F150?

- Common symptoms include rough idling, poor acceleration, stalling, and reduced fuel efficiency.

2. What does the OBDII code P0068 on a 1999 Ford F150 indicate?

- The code indicates an issue with the correlation between the Manifold Absolute Pressure (MAP) sensor, Mass Air Flow (MAF) sensor, and Throttle Position Sensor (TPS).

3. What are the possible causes of OBDII code P0068 in a 1999 Ford F150?

- Possible causes include a faulty MAP sensor, MAF sensor, TPS, wiring issues, vacuum leaks, or a problem with the engine control module (ECM).

4. How can I diagnose the cause of OBDII code P0068 on my 1999 Ford F150?

- Diagnosis typically involves checking the MAP, MAF, and TPS sensors for proper operation, inspecting for any damaged wiring, and testing the ECM for faults.

5. Can I continue driving my 1999 Ford F150 with OBDII code P0068?

- It is not recommended to continue driving with this code as it can lead to further engine performance issues and potential damage if left unresolved.

6. How can I repair OBDII code P0068 on my 1999 Ford F150?

- Repair options include replacing the faulty MAP, MAF, or TPS sensor, repairing damaged wiring, fixing vacuum leaks, or reprogramming the ECM if necessary.

7. Is it possible to reset the OBDII code P0068 on a 1999 Ford F150 without fixing the underlying issue?

- Resetting the code without addressing the underlying problem may temporarily clear the warning, but the issue will likely reoccur, leading to continued engine performance issues.

8. Are there any maintenance tips to prevent OBDII code P0068 in a 1999 Ford F150?

- Regularly inspecting and maintaining the MAP, MAF, and TPS sensors, as well as checking for vacuum leaks and ensuring proper wiring connections, can help prevent this code from appearing.

9. How long does it typically take to repair OBDII code P0068 in a 1999 Ford F150?

- The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a full day to diagnose and fix the problem correctly.

10. Can a DIY enthusiast fix OBDII code P0068 on a 1999 Ford F150, or should it be handled by a professional mechanic?

- While some experienced DIY enthusiasts may be able to diagnose and repair this code, it is generally recommended to consult a professional mechanic for proper diagnosis and repair to ensure the issue is addressed correctly.