AutoCodes – Cadillac – P1192 Cadillac

P1192 Cadillac Code - O2 Low Reference Circuit (NOx Sensor 1)

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, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides 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: P1192 Cadillac indicates O2 Low Reference Circuit (NOx Sensor 1).
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides 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 542

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1192 Cadillac 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 P1192 Cadillac - O2 Low Reference Circuit (NOx Sensor 1) - AutoCodes.com — P1192 Cadillac Code - O2 Low Reference Circuit (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P1192 Cadillac?

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

How to Fix the DTC P1192 Cadillac?

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 P1192 Cadillac 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 P1192 Cadillac Code

1. What are the common symptoms of OBDII code P1192 in a Cadillac related to the O2 Low Reference Circuit (NOx Sensor 1)?

- Common symptoms may include poor engine performance, reduced fuel efficiency, and an illuminated check engine light.

2. What are the possible causes of OBDII code P1192 in a Cadillac?

- The code P1192 in a Cadillac may be triggered by issues such as a faulty NOx sensor, damaged wiring or connectors, or a malfunctioning engine control module (ECM).

3. How can I diagnose OBDII code P1192 related to the O2 Low Reference Circuit in my Cadillac?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code, inspecting the NOx sensor and its connections, and checking for any damaged wiring or components in the circuit.

4. Can driving with an unresolved P1192 code in a Cadillac cause further damage?

- Continuing to drive with an unresolved P1192 code can potentially lead to decreased engine performance, increased emissions, and may cause damage to other components over time.

5. How can I repair OBDII code P1192 in my Cadillac associated with the O2 Low Reference Circuit?

- Repairing the P1192 code may involve replacing the NOx sensor, repairing or replacing damaged wiring or connectors, or reprogramming the ECM to address any underlying issues.

6. Is it possible to reset the check engine light after resolving the O2 Low Reference Circuit issue in a Cadillac?

- Yes, once the underlying problem causing the P1192 code is fixed, the check engine light can be reset using an OBDII scanner to clear the stored trouble code.

7. Are there any maintenance tips to prevent OBDII code P1192 in a Cadillac related to the NOx Sensor 1?

- Regularly inspecting and maintaining the NOx sensor, wiring, and connectors, as well as following the manufacturer's recommended service schedule, can help prevent issues leading to code P1192.

8. Can a faulty NOx sensor be cleaned or repaired, or does it need to be replaced?

- In most cases, a faulty NOx sensor causing code P1192 will need to be replaced, as cleaning or repairing the sensor is not typically effective in resolving the underlying issue.

9. How crucial is it to address OBDII code P1192 promptly in a Cadillac?

- It is important to address code P1192 promptly to ensure optimal engine performance, fuel efficiency, and emissions compliance, as well as to prevent potential damage to other components.

10. Can a DIY enthusiast with automotive knowledge fix OBDII code P1192 related to the O2 Low Reference Circuit in a Cadillac?

- While some DIY enthusiasts may be able to diagnose and repair code P1192, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair to ensure the issue is resolved correctly.