AutoCodes – Cadillac – P1193 Cadillac

P1193 Cadillac Code - O2 Low Reference Circuit Low Voltage (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: P1193 Cadillac indicates O2 Low Reference Circuit Low Voltage (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 536

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 P1193 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 P1193 Cadillac - O2 Low Reference Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P1193 Cadillac Code - O2 Low Reference Circuit Low Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P1193 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 P1193 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 P1193 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 P1193 Cadillac Code

1. What are the common symptoms of OBDII code P1193 in a Cadillac related to the O2 Low Reference Circuit Low Voltage (NOx Sensor 1)?

- Common symptoms include poor engine performance, reduced fuel efficiency, rough idling, and potentially increased emissions.

2. What are some possible causes of the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) error code P1193 in a Cadillac?

- Possible causes include a faulty NOx sensor, wiring issues in the O2 sensor circuit, exhaust system leaks, or a failing catalytic converter.

3. How can I diagnose the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) error code P1193 in my Cadillac?

- Use an OBDII scanner to retrieve the specific error code, visually inspect the NOx sensor and related wiring, and perform voltage and resistance tests to pinpoint the issue.

4. Can I continue driving my Cadillac with the OBDII code P1193 related to the O2 Low Reference Circuit Low Voltage (NOx Sensor 1)?

- It is not recommended to continue driving with this error code as it can lead to further damage to the engine or emissions system.

5. Will resetting the error code P1193 related to the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) in my Cadillac make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear.

6. How much does it typically cost to repair the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) error code P1193 in a Cadillac?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $200 to $500 for parts and labor.

7. Are there any DIY repair tips for fixing the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) error code P1193 in my Cadillac?

- DIY tips include checking and cleaning the sensor connectors, inspecting the wiring for damage, and ensuring proper installation of a new NOx sensor if needed.

8. Can a faulty O2 sensor cause the OBDII code P1193 related to the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) in a Cadillac?

- Yes, a faulty O2 sensor can contribute to triggering the P1193 code, so it's essential to inspect both the NOx sensor and the O2 sensor for issues.

9. How long does it typically take to repair the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) error code P1193 in a Cadillac?

- The repair time can vary based on the exact cause and complexity of the issue but may take anywhere from 1 to 3 hours at a professional repair shop.

10. Is it safe to drive my Cadillac with the OBDII code P1193 related to the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) if the vehicle seems to be running fine?

- It is not recommended to drive the vehicle with this error code present, as it can lead to potential long-term damage and may cause the vehicle to fail emissions tests.