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Engine-Codes – Generic – P112C

P112C Code - Oxygen Sensor Negative Current or Positive Current Control Circuit/Open Bank 1 Sensor 1

Quick Answer

The diagnostic trouble code P112C indicates an issue with the oxygen sensor negative current or positive current control circuit/open in Bank 1 Sensor 1. Common causes include Faulty oxygen sensor, Wiring issues in the oxygen sensor circuit, Corrosion or damage to the sensor connector. 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
P112C indicates Oxygen Sensor Negative Current or Positive Current Control Circuit/Open Bank 1 Sensor 1.
Common causes
Common causes include Faulty oxygen sensor, Wiring issues in the oxygen sensor circuit, Corrosion or damage to the sensor connector.
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 16, 2024
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Code P112C Description

The diagnostic trouble code P112C indicates an issue with the oxygen sensor negative current or positive current control circuit/open in Bank 1 Sensor 1. The oxygen sensor, also known as the O2 sensor, plays a crucial role in monitoring the oxygen levels in the exhaust gases of the vehicle. This information is essential for the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion efficiency.

OBDII Code P112C - Oxygen Sensor Negative Current or Positive Current Control Circuit/Open Bank 1 Sensor 1
P112C Code - Oxygen Sensor Negative Current or Positive Current Control Circuit/Open Bank 1 Sensor 1

Common Causes of P112C

  1. Faulty oxygen sensor.
  2. Wiring issues in the oxygen sensor circuit.
  3. Corrosion or damage to the sensor connector.
  4. ECM software issues.
  5. Exhaust leaks near the oxygen sensor.

Symptoms of P112C

  1. Check engine light illuminated on the dashboard.
  2. Decreased fuel efficiency.
  3. Rough idling or stalling.
  4. Engine misfires.
  5. Increased emissions.

How to Fix P112C

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to read the trouble codes and pinpoint the problem.
  2. Inspect the wiring and connectors of the oxygen sensor for any damage or corrosion. Repair or replace as necessary.
  3. Test the oxygen sensor using a multimeter to check for proper voltage and resistance readings.
  4. If the oxygen sensor is faulty, replace it with a new sensor compatible with your vehicle's make and model.
  5. Clear the trouble codes from the ECM memory and perform a test drive to ensure the issue has been resolved.

Cost to Fix P112C

The typical repair costs for addressing the P112C code can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor in your area. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable options.

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Code P112C Information for Specific Makes

  • P112C BMW — Upstream Oxygen Sensor Open Circuit Monitoring Virtual Ground Failure or Pumping Current Failure Bank 1
  • P112C Buick — Intake Air Temperature Sensor 3 Circuit Low Voltage
  • P112C Cadillac — Intake Air Temperature Sensor 3 Circuit Low Voltage
  • P112C Chevrolet — Intake Air Temperature Sensor 3 Circuit Low Voltage
  • P112C GMC — Intake Air Temperature Sensor 3 Circuit Low Voltage
  • P112C MINI — Upstream Oxygen Sensor Open Circuit Monitoring Virtual Ground Failure or Pumping Current Failure Bank 1
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.

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