AutoCodes – Chevrolet – P1133 2015 Chevrolet Silverado

P1133 2015 Chevrolet Silverado Code - HO2S Insufficient Switching Bank 1 Sensor 1

Quick Answer

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection. 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: P1133 2015 Chevrolet Silverado indicates HO2S Insufficient Switching Bank 1 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection.
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 394

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 28, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1133 2015 Chevrolet Silverado Description

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Engine Control Module (ECM) operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0 - 1, 000 mV. Once sufficient HO2S voltage fluctuation is observed by the ECM, Closed Loop is entered. The ECM uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the heated oxygen sensor rich-to-lean counts or the lean-to-rich counts are less than a calibrated value greater than 100s.

OBDII Code P1133 2015 Chevrolet Silverado - HO2S Insufficient Switching Bank 1 Sensor 1 - AutoCodes.com — P1133 2015 Chevrolet Silverado Code - HO2S Insufficient Switching Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P1133 2015 Chevrolet Silverado?

Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted
Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection
Low or high fuel system pressure
Fuel contamination
Faulty fuel injectors
Exhaust gas leaks
Engine vacuum leaks

How to Fix the DTC P1133 2015 Chevrolet Silverado?

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

Replacing the Front Heated Oxygen Sensors (HO2S) usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1133 2015 Chevrolet Silverado 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 P1133 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P1133 on a 2015 Chevrolet Silverado?

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

2. What does "HO2S Insufficient Switching Bank 1 Sensor 1" mean in relation to the P1133 code?

- This indicates that the oxygen sensor (O2 sensor) in Bank 1 Sensor 1 is not switching between rich and lean air/fuel mixtures as expected.

3. What are the possible causes of the P1133 code on a 2015 Chevrolet Silverado?

- Causes may include a faulty oxygen sensor, damaged wiring or connectors, vacuum leaks, exhaust system leaks, or issues with the fuel system.

4. How can I diagnose the P1133 code on my 2015 Chevrolet Silverado?

- Diagnosing involves inspecting the oxygen sensor, checking for wiring damage, scanning for other related codes, and performing a thorough visual inspection of the exhaust system.

5. Can driving with the P1133 trouble code on a 2015 Chevrolet Silverado cause further damage?

- Continuing to drive with the P1133 code may lead to reduced fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.

6. How should I repair the HO2S Insufficient Switching Bank 1 Sensor 1 issue on my 2015 Chevrolet Silverado?

- Repair typically involves replacing the Bank 1 Sensor 1 oxygen sensor, repairing any damaged wiring or connectors, and addressing any underlying issues causing the code.

7. Is it safe to reset the OBDII code P1133 on a 2015 Chevrolet Silverado using a diagnostic tool?

- While you can clear the code using a diagnostic tool, it's essential to address the root cause first to prevent the issue from recurring.

8. Can a DIY enthusiast fix the P1133 code on a 2015 Chevrolet Silverado?

- Depending on your skill level and access to tools, you may be able to replace the oxygen sensor or address wiring issues yourself. However, complex diagnostics may require professional assistance.

9. How long does it typically take to repair the P1133 code on a 2015 Chevrolet Silverado?

- The repair time can vary based on the exact cause of the code and your experience level. Replacing the oxygen sensor usually takes around 1-2 hours.

10. Are there any preventive measures to avoid the P1133 trouble code on a 2015 Chevrolet Silverado?

- Regular maintenance, such as checking and replacing oxygen sensors as recommended, inspecting exhaust system components, and addressing any engine performance issues promptly, can help prevent the P1133 code from appearing.