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P116B Buick Code - O2 Signal Circuit Low Voltage (NOx Sensor 1)

Quick Answer

The P116B Buick code refers to an issue with the O2 signal circuit having low voltage, specifically related to the NOx Sensor 1. Common causes include Faulty NOx sensor, Wiring issues in the O2 signal circuit, ECM software malfunction. 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
P116B Buick indicates O2 Signal Circuit Low Voltage (NOx Sensor 1).
Common causes
Common causes include Faulty NOx sensor, Wiring issues in the O2 signal circuit, ECM software malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P116B Buick Description

The P116B Buick code refers to an issue with the O2 signal circuit having low voltage, specifically related to the NOx Sensor 1. The NOx sensor, or Nitrogen Oxide sensor, is responsible for monitoring the levels of nitrogen oxide in the exhaust gases of the vehicle. When the O2 signal circuit detects low voltage, it indicates that there may be a problem with the sensor's ability to accurately measure the nitrogen oxide levels. This can lead to a variety of performance issues and potentially affect the vehicle's emissions output.

OBDII Code P116B Buick - O2 Signal Circuit Low Voltage (NOx Sensor 1)
P116B Buick Code - O2 Signal Circuit Low Voltage (NOx Sensor 1)

Common Causes of P116B Buick

  1. Faulty NOx sensor
  2. Wiring issues in the O2 signal circuit
  3. ECM software malfunction
  4. Exhaust leaks near the sensor
  5. Contaminated sensor with carbon buildup

Symptoms of P116B Buick

  1. Decreased fuel efficiency
  2. Engine misfires
  3. Rough idling
  4. Check engine light illuminated
  5. Reduced engine performance

How to Fix P116B Buick

  1. Diagnose the issue using a scan tool to confirm the P116B code and pinpoint the exact cause of the low voltage in the O2 signal circuit.
  2. Inspect the NOx sensor and wiring for any visible damage or corrosion. Replace the sensor if necessary.
  3. Check and repair any wiring or connections in the O2 signal circuit to ensure proper voltage is reaching the sensor.
  4. Clear the code using the scan tool after completing the repairs and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P116B Buick

The cost of repairing a P116B Buick code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $150 to $400 for parts and labor. Keep in mind that diagnostic time and labor rates can impact the final cost, so it's advisable to consult with a trusted mechanic or auto repair shop for a more accurate estimate.

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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 P116B Buick Code

1. What does the OBDII code P116B mean on a Buick?

P116B indicates a problem with the O2 signal circuit for NOx Sensor 1, specifically that it's reading a low voltage.

2. What are the common symptoms of a P116B code in a Buick?

Symptoms may include the check engine light turning on, reduced fuel efficiency, rough idling, and potential engine performance issues.

3. What causes the P116B code to appear?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the O2 signal circuit, or a malfunctioning engine control module (ECM).

4. Can I continue driving with a P116B code on my Buick?

While the vehicle may still run, it’s not advisable to ignore the issue as it can lead to reduced performance, higher emissions, and potential damage to other components.

5. How do you diagnose the P116B code on a Buick?

Diagnosis involves using a scan tool to confirm the code, inspecting the wiring and connectors for damage, and testing the NOx sensor for proper functionality.

6. How do you fix a P116B code on a Buick?

Repairs may include replacing a faulty NOx sensor, repairing or replacing damaged wiring or connectors, or reprogramming/updating the ECM if required.

7. How much does it cost to fix a P116B code on a Buick?

The cost varies depending on the specific repair, ranging from $200 to $600, with NOx sensor replacement being the most common expense.

8. Can a bad NOx sensor cause the P116B code?

Yes, a faulty NOx sensor is one of the most common causes of the P116B code.

9. Can a dirty air filter cause a P116B code on a Buick?

While unlikely, a severely clogged air filter could indirectly contribute to issues affecting the air-fuel mixture and sensor readings.

10. Will clearing the P116B code with a scan tool fix the issue?

Clearing the code may turn off the check engine light temporarily, but the underlying problem must be addressed to prevent the code from returning.

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