AutoCodes – Ford – P1152 2002 Ford F150

P1152 2002 Ford F150 Code - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2

Quick Answer

The Heated Oxygen Sensor (HO2S) Monitor is an on-board strategy designed to monitor the HO2S sensors for a malfunction or deterioration that can affect emissions. Common causes include Faulty Upstream Oxygen Sensor Bank 2, Fuel pressure high or low, MAF sensor dirty/defective. 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: P1152 2002 Ford F150 indicates Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2.
Common causes: Common causes include Faulty Upstream Oxygen Sensor Bank 2, Fuel pressure high or low, MAF sensor dirty/defective.
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 5,577

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 03, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1152 2002 Ford F150 Description

The Heated Oxygen Sensor (HO2S) Monitor is an on-board strategy designed to monitor the HO2S sensors for a malfunction or deterioration that can affect emissions. Under specific conditions, the fuel control or upstream HO2S sensors are checked for proper output voltage and response rate (the time it takes to switch from lean to rich or rich to lean). Downstream HO2S sensors used for Catalyst Monitor are also monitored for proper output voltage. Input is required from the Engine Coolant Temperature (ECT) or Cylinder Head Temperature (CHT), Inlet Air Temperature (IAT), Mass Air Flow (MAF), Throttle Position (TP) and Crankshaft Position (CKP) sensors to activate the HO2S Monitor. The Fuel System Monitor and Misfire Detection Monitor must also have completed successfully before the HO2S Monitor is enabled.
• The HO2S sensor senses the oxygen content in the exhaust flow and outputs a voltage between zero and 1.0 volt. Lean of stoichiometric (air/fuel ratio of approximately 14.7:1 for gasoline engines), the HO2S will generate a voltage between zero and 0.45 volt. Rich of stoichiometric, the HO2S will generate a voltage between 0.45 and 1.0 volt.
• The HO2S Monitor evaluates both the upstream (Fuel Control) and downstream (Catalyst Monitor) HO2S for proper function.
• Once the HO2S Monitor is enabled, the upstream HO2S signal voltage amplitude and response frequency are checked. Excessive voltage is determined by comparing the HO2S signal voltage to a maximum calibratable threshold voltage.
• A fixed frequency closed loop fuel control routine is executed and the upstream HO2S voltage amplitude and output response frequency are observed. A sample of the upstream HO2S signal is evaluated to determine if the sensor is capable of switching or has a slow response rate.
• An HO2S heater circuit fault is determined by turning the heater on and off and looking for a corresponding change in the OSM and by
measuring the current going through the heater circuit.
• The MIL is activated after a fault is detected on two consecutive OBD II drive cycles.

OBDII Code P1152 2002 Ford F150 - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2 - AutoCodes.com — P1152 2002 Ford F150 Code - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2

What does this mean?

What are the Possible Causes of the DTC P1152 2002 Ford F150?

Faulty Upstream Oxygen Sensor Bank 2
Fuel pressure high or low
MAF sensor dirty/defective
Vacuum leak on engine
Leaking fuel injector or fuel pressure regulator
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1152 2002 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 P1152 2002 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 P1152 2002 Ford F150 code?

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Need Help with the 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 P1152 2002 Ford F150 Code

1. What are the common symptoms of OBDII code P1152 in a 2002 Ford F150?

- Common symptoms include decreased fuel efficiency, rough idling, engine misfires, and the illumination of the Check Engine light.

2. What does the OBDII code P1152 for a 2002 Ford F150 mean?

- This code indicates that the upstream heated oxygen sensor on Bank 2 is detecting a consistently rich air-fuel mixture.

3. What are the possible causes of OBDII code P1152 in a 2002 Ford F150?

- Possible causes include a faulty oxygen sensor, a vacuum leak, a malfunctioning fuel injector, a dirty air filter, or a problem with the fuel pressure regulator.

4. How can I diagnose the issue causing OBDII code P1152 in my 2002 Ford F150?

- You can diagnose the problem by visually inspecting the oxygen sensor, checking for vacuum leaks, testing the fuel injectors, and using a scan tool to monitor sensor readings.

5. Can I continue driving my 2002 Ford F150 with OBDII code P1152?

- It is not recommended to continue driving with this code present, as it can lead to poor engine performance and potential damage to other components.

6. How do I repair OBDII code P1152 on a 2002 Ford F150?

- Repair options may include replacing the upstream heated oxygen sensor, fixing vacuum leaks, cleaning or replacing the air filter, checking and cleaning the fuel injectors, or addressing fuel pressure issues.

7. Is it possible to reset OBDII code P1152 in a 2002 Ford F150 without fixing the underlying issue?

- While you can clear the code with a scan tool, it will likely return if the root cause of the rich air-fuel mixture is not addressed.

8. How much does it typically cost to repair OBDII code P1152 in a 2002 Ford F150?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

9. What are the long-term effects of ignoring OBDII code P1152 in a 2002 Ford F150?

- Ignoring this code can lead to decreased fuel economy, engine damage, and potential failure of the catalytic converter over time.

10. Can a DIY enthusiast fix OBDII code P1152 in a 2002 Ford F150?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to address this code by replacing the oxygen sensor or checking for common issues like vacuum leaks.