AutoCodes – Generic – P2243

P2243 Code - O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1

Quick Answer

The Front Oxygen Sensor (O2 Sensor 1) is placed into the exhaust manifold. Common causes include Faulty Front Oxygen Sensor Bank 1, Front Oxygen Sensor Bank 1 harness is open or shorted, Front Oxygen Sensor Bank 1 circuit poor electrical connection. 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: P2243 indicates O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1.
Common causes: Common causes include Faulty Front Oxygen Sensor Bank 1, Front Oxygen Sensor Bank 1 harness is open or shorted, Front Oxygen Sensor Bank 1 circuit poor electrical connection.
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.

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Code Popularity 40,265

How popular is this code, among other codes? Medium

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2243 Description

The Front Oxygen Sensor (O2 Sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

OBDII Code P2243 - O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1 - AutoCodes.com — P2243 Code - O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P2243?

Faulty Front Oxygen Sensor Bank 1
Front Oxygen Sensor Bank 1 harness is open or shorted
Front Oxygen Sensor Bank 1 circuit poor electrical connection

How to Fix the DTC P2243?

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 P2243 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.

Need more information about the P2243 code?

Need more information on how to fix the P2243 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P2243 Acura — O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1
P2243 BMW — Upstream Oxygen Sensor Open Circuit Monitoring Reference Voltage Failure Bank 1
P2243 Dodge — O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1
P2243 Ford — O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1
P2243 Honda — O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1
P2243 Hyundai — O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1
P2243 KIA — O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1
P2243 Lincoln — O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1
P2243 Mazda — O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1
P2243 Mercury — O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1
P2243 MINI — Upstream Oxygen Sensor Open Circuit Monitoring Reference Voltage 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.

Frequently Asked Questions about P2243 Code

1. What are the common symptoms of OBDII code P2243?

- Common symptoms include rough idling, decreased fuel efficiency, engine misfires, and the illumination of the check engine light.

2. What does the O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1 mean?

- This code indicates that there is an open circuit in the reference voltage circuit of the upstream oxygen sensor in bank 1 of the engine.

3. What are the possible causes of OBDII code P2243?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or issues with the engine control module (ECM).

4. How can I diagnose the O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1 issue?

- Diagnosis typically involves checking the oxygen sensor, inspecting the wiring and connectors, testing the fuse, and using a scan tool to monitor sensor data.

5. Can I drive my vehicle with OBDII code P2243?

- It is generally not recommended to drive your vehicle with this code, as it can lead to further damage and decreased performance.

6. How can I repair OBDII code P2243?

- Repair options may include replacing the oxygen sensor, repairing or replacing damaged wiring, ensuring proper connections, and resetting the ECM.

7. Is it possible to reset the check engine light after fixing OBDII code P2243?

- Yes, once the underlying issue is resolved, the check engine light can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

8. Can a DIY enthusiast fix OBDII code P2243?

- Depending on your skill level and access to tools, it may be possible to address this code yourself by following repair guides and diagnostic steps carefully.

9. How urgent is it to address OBDII code P2243?

- While your vehicle may still be operable with this code, it is important to address it promptly to prevent potential damage to the engine and ensure optimal performance.

10. How can I prevent O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1 issues in the future?

- Regular maintenance, including checking and replacing oxygen sensors at recommended intervals, inspecting wiring for damage, and keeping the ECM updated, can help prevent this issue from occurring.