AutoCodes – Ford – P1157 2000 Ford F150

P1157 2000 Ford F150 Code - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Lean

Quick Answer

The Heated Oxygen Sensor 2 (HO2S2) (Downstream), after the three-way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Exhaust gas leaks, Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 2, Heated Oxygen Sensor 2 Bank 2 harness is open or shorted. 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: P1157 2000 Ford F150 indicates Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Lean.
Common causes: Common causes include Exhaust gas leaks, Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 2, Heated Oxygen Sensor 2 Bank 2 harness is open or shorted.
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 2,390

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 Jul 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1157 2000 Ford F150 Description

The Heated Oxygen Sensor 2 (HO2S2) (Downstream), after the three-way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air-fuel mixture (air-fuel ratio) must maintain near the ideal stoichiometric ratio. The HO2S2 output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Powertrain Control Module (PCM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S2 generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The PCM interprets Lean when the HO2S2 voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The PCM interprets Rich when the HO2S2 voltage is above 0.45 V. The P1157 code will set when the PCM detects that the HO2S2 signal is below the voltage of range for an extended period.

OBDII Code P1157 2000 Ford F150 - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Lean - AutoCodes.com — P1157 2000 Ford F150 Code - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Lean

What does this mean?

What are the Possible Causes of the DTC P1157 2000 Ford F150?

Exhaust gas leaks
Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 2
Heated Oxygen Sensor 2 Bank 2 harness is open or shorted
Heated Oxygen Sensor 2 Bank 2 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors

How to Fix the DTC P1157 2000 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 P1157 2000 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 P1157 2000 Ford F150 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 P1157 2000 Ford F150 Code

1. What are the common symptoms of OBDII code P1157 in a 2000 Ford F150?

- Common symptoms include decreased fuel efficiency, rough idling, and potential misfires.

2. What does the OBDII code P1157 in a 2000 Ford F150 mean?

- The code indicates that the heated oxygen sensor on bank 2 sensor 2 is detecting a lean air/fuel mixture.

3. What are the possible causes of OBDII code P1157 in a 2000 Ford F150?

- Possible causes include a faulty oxygen sensor, vacuum leaks, exhaust leaks, or issues with the fuel system.

4. How can I diagnose the cause of OBDII code P1157 in my 2000 Ford F150?

- Diagnosing the issue may involve checking the oxygen sensor's wiring, inspecting for vacuum or exhaust leaks, and examining the fuel system components.

5. Can a dirty or contaminated oxygen sensor trigger code P1157 in a 2000 Ford F150?

- Yes, a dirty or contaminated oxygen sensor can lead to incorrect readings and trigger the P1157 code.

6. What are some repair tips for addressing OBDII code P1157 in a 2000 Ford F150?

- Repair tips may include cleaning or replacing the oxygen sensor, fixing any leaks, and ensuring proper fuel system operation.

7. Is it safe to continue driving with OBDII code P1157 present in a 2000 Ford F150?

- It is not recommended to drive for an extended period with the P1157 code, as it can lead to further engine damage and decreased performance.

8. How much does it typically cost to repair OBDII code P1157 in a 2000 Ford F150?

- The cost of repairs can vary depending on the specific issue, but it may involve replacing the oxygen sensor, fixing leaks, or addressing fuel system problems.

9. Can a DIY enthusiast fix OBDII code P1157 in a 2000 Ford F150?

- Depending on the skill level, DIY enthusiasts may be able to address simpler causes like cleaning or replacing the oxygen sensor, but more complex issues may require professional help.

10. How often does OBDII code P1157 occur in a 2000 Ford F150?

- The occurrence of the P1157 code can vary, but it is not an uncommon issue in vehicles with older oxygen sensors or potential leaks in the exhaust or vacuum systems.