AutoCodes – Ford – P1128 2001 Ford F150

P1128 2001 Ford F150 Code - Front O2 Sensor Connectors Swapped

Quick Answer

The Diagnostic Trouble Code (DTC) will set anytime the Powertrain Control Module (PCM) Detects Upstream Oxygen Sensors swapped from Bank to Bank. Common causes include Crossed HO2S Harness Connectors, Powertrain Control Module (PCM) Harness Connector. 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: P1128 2001 Ford F150 indicates Front O2 Sensor Connectors Swapped.
Common causes: Common causes include Crossed HO2S Harness Connectors, Powertrain Control Module (PCM) Harness Connector.
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 1,700

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 03, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1128 2001 Ford F150 Description

The Diagnostic Trouble Code (DTC) will set anytime the Powertrain Control Module (PCM) Detects Upstream Oxygen Sensors swapped from Bank to Bank. Heated Exhaust Gas Oxygen (HEGO) Sensor Monitor checks & determines if the HO2S signal response for fuel shift corresponds to the correct engine bank. The code sets when HO2S being tested is not indicated.

OBDII Code P1128 2001 Ford F150 - Front O2 Sensor Connectors Swapped - AutoCodes.com — P1128 2001 Ford F150 Code - Front O2 Sensor Connectors Swapped

What does this mean?

What are the Possible Causes of the DTC P1128 2001 Ford F150?

Crossed HO2S Harness Connectors
Powertrain Control Module (PCM) Harness Connector

How to Fix the DTC P1128 2001 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1128 2001 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 P1128 2001 Ford F150 Code

1. What are the common symptoms of OBDII code P1128 in a 2001 Ford F150?

The common symptoms of code P1128 include poor fuel economy, rough idle, and a noticeable decrease in engine performance.

2. What does the OBDII code P1128 "Front O2 Sensor Connectors Swapped" mean for a 2001 Ford F150?

This code indicates that the front oxygen sensor connectors have been swapped, causing incorrect readings and affecting the engine's fuel-air mixture.

3. What are the possible causes of the OBDII code P1128 in a 2001 Ford F150?

The main causes of code P1128 include a wiring issue, faulty front oxygen sensors, or incorrect installation of the oxygen sensor connectors.

4. How can I diagnose the OBDII code P1128 in a 2001 Ford F150?

Diagnosing code P1128 involves checking the wiring connections of the front oxygen sensors, inspecting the sensor connectors, and testing the sensors themselves for proper function.

5. What is the repair process for OBDII code P1128 in a 2001 Ford F150?

To repair code P1128, you may need to correct the swapped oxygen sensor connectors, replace any faulty oxygen sensors, or repair any wiring issues causing the problem.

6. Can I drive my 2001 Ford F150 with OBDII code P1128 "Front O2 Sensor Connectors Swapped"?

It is not recommended to drive your vehicle with code P1128 as it can lead to further engine damage and poor performance. It is best to address the issue promptly.

7. How can I prevent OBDII code P1128 from appearing in my 2001 Ford F150?

To prevent code P1128, ensure proper installation of oxygen sensor connectors, follow correct sensor replacement procedures, and regularly inspect and maintain your vehicle's oxygen sensors.

8. Will resetting the OBDII code P1128 in my 2001 Ford F150 make it go away permanently?

Resetting the code may temporarily clear the error, but if the underlying issue of swapped oxygen sensor connectors is not addressed, the code is likely to reappear.

9. Are there any safety concerns associated with OBDII code P1128 in a 2001 Ford F150?

While code P1128 itself does not pose immediate safety risks, driving with incorrect fuel-air mixture due to swapped oxygen sensor connectors can lead to engine problems and potential breakdowns.

10. Can a DIY enthusiast fix OBDII code P1128 in a 2001 Ford F150?

Depending on their skill level, a DIY enthusiast may be able to address code P1128 by checking and correcting the oxygen sensor connectors, replacing faulty sensors, or repairing wiring issues.