AutoCodes – BMW – P1133 BMW

P1133 BMW Code - HO2S Insufficient Switching Sensor 1

Quick Answer

The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after closed loop operation has begun. Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Vacuum leak, Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 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: P1133 BMW indicates HO2S Insufficient Switching Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Vacuum leak, Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 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 1,141

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 17, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1133 BMW Description

The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after closed loop operation has begun. The PCM determines if the front HO2S is functioning properly by counting the number of HO2S-1 Lean/Rich (L/R) and Rich/Lean (R/L) switches.

OBDII Code P1133 BMW - HO2S Insufficient Switching Sensor 1 - AutoCodes.com — P1133 BMW Code - HO2S Insufficient Switching Sensor 1

What does this mean?

What are the Possible Causes of the DTC P1133 BMW?

Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
Vacuum leak
Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted
Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 circuit poor electrical connection

How to Fix the DTC P1133 BMW?

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 P1133 BMW 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 BMW Code

1. What are the common symptoms of OBDII code P1133 in a BMW?

The common symptoms of code P1133 include poor fuel economy, rough idling, and hesitation during acceleration.

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

HO2S stands for Heated Oxygen Sensor, and the code P1133 indicates that the oxygen sensor located before the catalytic converter is not switching between rich and lean air/fuel mixtures properly.

3. What are the potential causes of OBDII code P1133 in a BMW?

Potential causes of code P1133 include a faulty oxygen sensor, vacuum leaks, exhaust leaks, fuel pressure issues, or a problem with the engine's air intake system.

4. How can I diagnose the OBDII code P1133 in my BMW?

Diagnosing code P1133 typically involves checking the oxygen sensor's wiring and connections, testing the sensor's performance, inspecting for any vacuum or exhaust leaks, and verifying proper fuel pressure.

5. Can driving with the OBDII code P1133 cause further damage to my BMW?

Continued driving with code P1133 may lead to decreased fuel efficiency, increased emissions, and potential damage to the catalytic converter over time.

6. How can I repair OBDII code P1133 in my BMW?

Repairing code P1133 often involves replacing the faulty oxygen sensor, fixing any leaks in the exhaust system, addressing vacuum leaks, or resolving fuel pressure issues.

7. Is it safe to continue driving my BMW with the OBDII code P1133?

While it may be safe to drive your BMW with code P1133 in the short term, it is recommended to address the issue promptly to prevent further complications and ensure optimal performance.

8. Can I reset the OBDII code P1133 in my BMW by disconnecting the battery?

Disconnecting the battery may clear the code temporarily, but it is not a permanent solution. It is best to diagnose and repair the underlying issue causing code P1133.

9. How much does it typically cost to repair OBDII code P1133 in a BMW?

The cost of repairing code P1133 can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. How often does OBDII code P1133 occur in BMW vehicles?

Code P1133 can occur in BMW vehicles with varying frequency, depending on factors such as vehicle age, maintenance history, and driving conditions. Regular maintenance and timely repairs can help prevent this code from appearing.