AutoCodes – Buick – P119D Buick

P119D Buick Code - NOx Sensor 2 Signal Circuit

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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: P119D Buick indicates NOx Sensor 2 Signal Circuit.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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 357

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P119D Buick Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within the sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.

OBDII Code P119D Buick - NOx Sensor 2 Signal Circuit - AutoCodes.com — P119D Buick Code - NOx Sensor 2 Signal Circuit

What does this mean?

What are the Possible Causes of the DTC P119D Buick?

Faulty Nitrogen Oxides (NOx) Sensor 2
Nitrogen Oxides Sensor 2 harness is open or shorted
Nitrogen Oxides Sensor 2 circuit poor electrical connection

How to Fix the DTC P119D Buick?

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 P119D Buick 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 P119D Buick Code

1. What are the common symptoms of OBDII code P119D related to the NOx Sensor 2 Signal Circuit in a Buick?

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

2. What are the possible causes of OBDII code P119D in a Buick, specifically related to the NOx Sensor 2 Signal Circuit?

- Possible causes may include a faulty NOx sensor, wiring issues, sensor circuit problems, or issues with the powertrain control module (PCM).

3. How can I diagnose the NOx Sensor 2 Signal Circuit issue causing OBDII code P119D in my Buick?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the NOx sensor and its wiring for damage, and testing the sensor's functionality.

4. Can driving with OBDII code P119D related to the NOx Sensor 2 Signal Circuit in a Buick cause further damage?

- Continued driving with this issue may lead to increased emissions, potential damage to other engine components, and a decrease in overall vehicle performance.

5. What are some repair tips for addressing OBDII code P119D in a Buick due to the NOx Sensor 2 Signal Circuit problem?

- Repair tips may include replacing the faulty NOx sensor, repairing damaged wiring, resetting the fault code with an OBDII scanner, and verifying proper sensor operation.

6. Is it possible to reset OBDII code P119D triggered by the NOx Sensor 2 Signal Circuit issue in a Buick without fixing the underlying problem?

- While you can clear the fault code temporarily, it is crucial to address the root cause of the issue to prevent further complications and ensure proper vehicle operation.

7. How much does it typically cost to repair OBDII code P119D associated with the NOx Sensor 2 Signal Circuit in a Buick?

- Repair costs can vary depending on the specific issue, but they may range from $200 to $600, including parts and labor.

8. Are there any recalls or technical service bulletins related to OBDII code P119D linked to the NOx Sensor 2 Signal Circuit in Buick vehicles?

- It's recommended to check with Buick dealership or the National Highway Traffic Safety Administration (NHTSA) website for any recalls or technical service bulletins related to this specific OBDII code.

9. Can a DIY enthusiast with basic mechanical skills fix OBDII code P119D related to the NOx Sensor 2 Signal Circuit in a Buick?

- Depending on the specific issue, some DIY repairs may be possible, such as sensor replacement or basic wiring checks. However, complex diagnostics and repairs may require professional assistance.

10. How often should the NOx sensor be inspected and maintained to avoid triggering OBDII code P119D in a Buick?

- It is recommended to follow the manufacturer's maintenance schedule, which typically includes periodic inspection and potential replacement of the NOx sensor as part of routine vehicle maintenance.