AutoCodes – Ford – P1158 2003 Ford F150

P1158 2003 Ford F150 Code - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Rich

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: P1158 2003 Ford F150 indicates Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Rich.
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 2,526

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
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Code P1158 2003 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 P1158 code will set when the PCM detects that the HO2S2 signal is above the voltage of range for an extended period.

OBDII Code P1158 2003 Ford F150 - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Rich - AutoCodes.com — P1158 2003 Ford F150 Code - Lack Of Heated Oxygen Sensor Switches Bank 2 Sensor 2 Indicates Rich

What does this mean?

What are the Possible Causes of the DTC P1158 2003 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 P1158 2003 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 P1158 2003 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 P1158 2003 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 P1158 2003 Ford F150 Code

What does OBDII code P1158 mean in a 2003 Ford F150?

Code P1158 indicates that the heated oxygen sensor (HO2S) for Bank 2, Sensor 2 is not switching as expected and is stuck indicating a rich condition.

What are the symptoms of code P1158 in a 2003 Ford F150?

Common symptoms include a check engine light, poor fuel economy, rough idling, and possibly a strong fuel smell from the exhaust.

What causes code P1158 in a 2003 Ford F150?

Common causes include a faulty oxygen sensor, exhaust leaks, wiring issues, a rich air-fuel mixture, or problems with the fuel injectors or fuel pressure regulator.

How do I diagnose the cause of a P1158 code?

Start by inspecting the oxygen sensor and its wiring for damage, test the sensorâ€™s operation, check for vacuum or exhaust leaks, and ensure the fuel system is functioning properly.

Can a dirty or faulty mass airflow sensor cause a P1158 code?

Yes, a malfunctioning mass airflow sensor can lead to a rich air-fuel mixture, which may trigger the P1158 code.

Is it safe to drive with a P1158 code?

Driving with a P1158 code can lead to poor fuel economy and potential damage to the catalytic converter if the rich condition persists. Address the issue promptly.

How do I fix code P1158 in a 2003 Ford F150?

Repair steps may include replacing the faulty oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or addressing fuel system issues causing a rich mixture.

How much does it cost to fix a P1158 code?

Repair costs vary but typically range from $100 to $300 if replacing an oxygen sensor. Additional repairs for wiring or fuel system issues may increase the cost.

Can a bad catalytic converter cause a P1158 code?

While uncommon, a damaged catalytic converter may affect downstream oxygen sensor readings and contribute to this code.

How do I prevent a P1158 code from recurring?

Regular maintenance, including monitoring oxygen sensor performance, ensuring fuel system health, and checking for exhaust or vacuum leaks, can help prevent this code.