AutoCodes – BMW – P0136 BMW

P0136 BMW Code - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

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 1, Heated Oxygen Sensor 2 Bank 1 harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0136 BMW indicates Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2.
Common causes: Common causes include Exhaust gas leaks, Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 1, Heated Oxygen Sensor 2 Bank 1 harness is open or shorted.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 4,324

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 31, 2021

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0136 BMW 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 P0136 code will set when the PCM detects that the HO2S2 signal voltage is out of range for an extended period.

OBDII Code P0136 BMW - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com — P0136 BMW Code - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0136 BMW?

Exhaust gas leaks
Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 1
Heated Oxygen Sensor 2 Bank 1 harness is open or shorted
Heated Oxygen Sensor 2 Bank 1 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors

How to Fix the DTC P0136 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 P0136 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 P0136 BMW Code

1. What does OBDII code P0136 on a BMW mean?

This code indicates a Heated Oxygen Sensor Circuit Malfunction for Bank 1 Sensor 2.

2. What are the common symptoms of a P0136 code in a BMW?

Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.

3. What causes a Heated Oxygen Sensor Circuit Malfunction in Bank 1 Sensor 2 on a BMW?

Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a vacuum leak, or issues with the engine's fuel system.

4. How can I diagnose a P0136 code on my BMW?

Diagnosing this code typically involves using an OBDII scanner to read the code, inspecting the oxygen sensor and its connections, checking for vacuum leaks, and testing the sensor's heating element.

5. Can I drive my BMW with a P0136 error code?

It is not recommended to drive your BMW with a P0136 code as it can lead to poor engine performance and potential damage if left unresolved.

6. How do I repair a Heated Oxygen Sensor Circuit Malfunction in Bank 1 Sensor 2 on my BMW?

Repairing this issue often involves replacing the oxygen sensor, repairing any damaged wiring or connectors, fixing vacuum leaks, or addressing fuel system problems.

7. How much does it cost to fix a P0136 code on a BMW?

The cost of fixing a P0136 code on a BMW can vary depending on the root cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

8. Can I reset the Check Engine Light after fixing a P0136 code on my BMW?

Yes, you can reset the Check Engine Light using an OBDII scanner after fixing the underlying issue causing the P0136 code.

9. How often should I replace the oxygen sensor in my BMW to prevent P0136 codes?

It is recommended to replace the oxygen sensor in your BMW every 60,000 to 90,000 miles to prevent issues like the P0136 code from occurring.

10. Are there any DIY tips for addressing a P0136 code in a BMW?

While some minor repairs can be done by DIY enthusiasts, it is best to consult a professional mechanic for accurate diagnosis and repair of a P0136 code in a BMW.