AutoCodes – BMW – P126C BMW

P126C BMW Code - Nitrogen Oxide Sensor Adjustment Fault At Start Of Charging Phase

Quick Answer

The Engine Control Module (ECM) monitors the Nitrogen Oxide (NOx) Sensor. Common causes include Faulty Nitrogen Oxide (NOx) Sensor, Nitrogen Oxide (NOx) Sensor harness is open or shorted, Nitrogen Oxide (NOx) Sensor 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: P126C BMW indicates Nitrogen Oxide Sensor Adjustment Fault At Start Of Charging Phase.
Common causes: Common causes include Faulty Nitrogen Oxide (NOx) Sensor, Nitrogen Oxide (NOx) Sensor harness is open or shorted, Nitrogen Oxide (NOx) Sensor 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 2,000

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P126C BMW Description

The Engine Control Module (ECM) monitors the Nitrogen Oxide (NOx) Sensor. The ECM sets the OBDII code when the Nitrogen Oxide (NOx) Sensor is not to factory specifications.

OBDII Code P126C BMW - Nitrogen Oxide Sensor Adjustment Fault At Start Of Charging Phase - AutoCodes.com — P126C BMW Code - Nitrogen Oxide Sensor Adjustment Fault At Start Of Charging Phase

What does this mean?

What are the Possible Causes of the DTC P126C BMW?

Faulty Nitrogen Oxide (NOx) Sensor
Nitrogen Oxide (NOx) Sensor harness is open or shorted
Nitrogen Oxide (NOx) Sensor circuit poor electrical connection

How to Fix the DTC P126C 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 P126C 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.

Need more information about the P126C BMW code?

Need more information on how to fix the P126C BMW code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P126C BMW code diagnosed by a professional: Find a repair shop in your area

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 P126C BMW Code

1. What are the common symptoms of OBDII code P126C in a BMW?

- Common symptoms include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What causes the Nitrogen Oxide Sensor Adjustment Fault at the start of the charging phase in a BMW?

- This fault is typically caused by a malfunction in the nitrogen oxide sensor or issues with the sensor's adjustment during the charging phase.

3. How can I diagnose the P126C code in my BMW?

- Diagnosing the P126C code involves using an OBDII scanner to read the fault codes stored in the vehicle's computer system. Additionally, a thorough inspection of the nitrogen oxide sensor and its wiring may be necessary.

4. Can I continue driving my BMW with the P126C fault code?

- It is not recommended to continue driving your BMW with the P126C fault code present, as it can lead to further damage to the vehicle's emission control system and potentially cause more serious issues over time.

5. How can I repair the Nitrogen Oxide Sensor Adjustment Fault in my BMW?

- Repairing the P126C fault may involve replacing the nitrogen oxide sensor, adjusting the sensor during the charging phase, or repairing any damaged wiring or connections related to the sensor.

6. Is the P126C fault code common in BMW vehicles?

- The P126C fault code related to the nitrogen oxide sensor adjustment fault at the start of the charging phase is more commonly found in BMW vehicles equipped with advanced emission control systems.

7. Can a DIY enthusiast fix the P126C fault in a BMW?

- While some DIY enthusiasts may be able to diagnose and repair the P126C fault themselves, it is recommended to seek assistance from a qualified mechanic or BMW specialist due to the complexity of the emission control system.

8. How much does it cost to repair the P126C fault in a BMW?

- The cost of repairing the P126C fault can vary depending on the specific underlying issue, the model of the BMW, and labor costs. It is advisable to obtain a quote from a reputable repair shop for an accurate estimate.

9. Will resetting the fault codes make the P126C code go away?

- Resetting the fault codes may temporarily clear the check engine light, but the underlying issue causing the P126C code will persist. It is important to diagnose and repair the fault to prevent further problems.

10. Can a faulty nitrogen oxide sensor affect the performance of my BMW?

- Yes, a faulty nitrogen oxide sensor can impact the performance of your BMW by causing decreased fuel efficiency, emissions issues, and potential drivability problems.