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Engine-Codes – Generic – P2240

P2240 Code - O2 Sensor Positive Current Control Circuit Open Bank 2 Sensor 1

Quick Answer

The P2240 code indicates a problem with the O2 sensor positive current control circuit in Bank 2 Sensor 1 of the vehicle's exhaust system. Common causes include Faulty O2 sensor, Wiring or connector issues in the O2 sensor circuit, ECM malfunction. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P2240 indicates O2 Sensor Positive Current Control Circuit Open Bank 2 Sensor 1.
Common causes
Common causes include Faulty O2 sensor, Wiring or connector issues in the O2 sensor circuit, ECM malfunction.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P2240 Description

The P2240 code indicates a problem with the O2 sensor positive current control circuit in Bank 2 Sensor 1 of the vehicle's exhaust system. This sensor plays a crucial role in monitoring the oxygen levels in the exhaust gases, helping the engine control module (ECM) adjust the air-fuel mixture for optimal combustion. An open circuit in this sensor can lead to inaccurate readings and affect the engine's performance and emissions.

OBDII Code P2240 - O2 Sensor Positive Current Control Circuit Open Bank 2 Sensor 1
P2240 Code - O2 Sensor Positive Current Control Circuit Open Bank 2 Sensor 1

Common Causes of P2240

  1. Faulty O2 sensor
  2. Wiring or connector issues in the O2 sensor circuit
  3. ECM malfunction
  4. Exhaust system leaks
  5. Engine running too rich or lean

Symptoms of P2240

  1. Decreased fuel efficiency
  2. Rough idling
  3. Engine hesitation or stalling
  4. Increased emissions
  5. Engine misfires

How to Fix P2240

  1. Diagnose the O2 sensor circuit using a multimeter to check for continuity and proper voltage.
  2. Inspect the wiring and connectors for any damage or corrosion and repair or replace as needed.
  3. Test the O2 sensor itself to determine if it's functioning properly and replace if necessary.
  4. Clear the fault codes and reset the ECM to see if the issue is resolved.
  5. Perform a test drive to confirm that the repairs have addressed the problem.

Cost to Fix P2240

The cost of repairing a P2240 code can vary depending on the specific cause of the issue. In general, replacing an O2 sensor can cost between $100 to $200, while addressing wiring or connector issues may range from $50 to $150. Labor costs at auto repair shops typically range from $80 to $150 per hour, so the total repair cost can be estimated based on the time required to diagnose and fix the problem. It's recommended to consult with a trusted mechanic for a more accurate cost estimate based on the vehicle's make and model.

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Code P2240 Information for Specific Makes

  • P2240 Acura — Front Air/Fuel Ratio Sensor Bank 2 Sensor 1 IP Line High Voltage
  • P2240 Dodge — O2 Sensor Positive Current Control Circuit Open Bank 2 Sensor 1
  • P2240 Ford — Oxygen Sensor Positive Current Control Circuit Open Bank 2 Sensor 1
  • P2240 Honda — Front Air/Fuel Ratio Sensor Bank 2 Sensor 1 IP Line High Voltage
  • P2240 Lexus — A/F Sensor Bank 2 Open Circuit
  • P2240 Lincoln — Oxygen Sensor Positive Current Control Circuit Open - Bank 2 Sensor 1
  • P2240 Mercury — Oxygen Sensor Positive Current Control Circuit Open Bank 2 Sensor 1
  • P2240 Scion — A/F Sensor Bank 2 Open Circuit
  • P2240 Toyota — A/F Sensor Bank 2 Open Circuit
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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