AutoCodes – Generic – P119F

P119F Code - NOx Sensor 2 Signal Circuit High Voltage

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: P119F indicates NOx Sensor 2 Signal Circuit High Voltage.
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 5,200

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 Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P119F 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 P119F - NOx Sensor 2 Signal Circuit High Voltage - AutoCodes.com — P119F Code - NOx Sensor 2 Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P119F?

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 P119F?

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 P119F 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 P119F code?

Need more information on how to fix the P119F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P119F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P119F Buick — NOx Sensor 2 Signal Circuit High Voltage
P119F Cadillac — NOx Sensor 2 Signal Circuit High Voltage
P119F Chevrolet — NOx Sensor 2 Signal Circuit High Voltage
P119F GMC — NOx Sensor 2 Signal Circuit High Voltage

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 P119F Code

1. What are the common symptoms of OBDII code P119F (NOx Sensor 2 Signal Circuit High Voltage)?

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

2. What are the possible causes of OBDII code P119F?

- The code P119F can be triggered by issues such as a faulty NOx sensor, damaged wiring or connectors, or problems with the engine control module.

3. How can I diagnose the cause of OBDII code P119F?

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

4. Can I continue driving with OBDII code P119F active?

- It is not recommended to continue driving with the code active, as it can lead to further damage to the vehicle and potentially affect emissions.

5. How can I fix OBDII code P119F?

- Repair options may include replacing the NOx sensor, repairing damaged wiring or connectors, or reprogramming the engine control module. It is advisable to consult a professional mechanic for accurate diagnosis and repair.

6. Are there any DIY tips for troubleshooting OBDII code P119F?

- DIY tips may include visually inspecting the sensor and its connections, checking for loose or damaged wiring, and ensuring proper voltage supply to the sensor.

7. Is OBDII code P119F specific to a certain vehicle make or model?

- OBDII code P119F can be found in various vehicle makes and models equipped with NOx sensors and is not specific to a particular manufacturer.

8. Can weather conditions affect the triggering of OBDII code P119F?

- Extreme weather conditions, such as high temperatures, can potentially impact the operation of the NOx sensor and lead to the triggering of code P119F.

9. How soon should I address OBDII code P119F once detected?

- It is recommended to address code P119F promptly to prevent further damage to the vehicle and ensure optimal engine performance and emissions compliance.

10. Is resetting the check engine light enough to resolve OBDII code P119F?

- Simply resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing code P119F. Professional diagnosis and repair are recommended.