AutoCodes – Toyota – P2238 2017 Toyota RAV4

P2238 2017 Toyota RAV4 Code - A/F Sensor Bank 1 Short Circuit

Quick Answer

The Air Fuel Ratio (A/F) sensor generates a voltage that corresponds to the actual air-fuel ratio. Common causes include Faulty Air Fuel Ratio (A/F) Sensor Bank 1 Sensor 1, Air Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted, Air Fuel Ratio Sensor Bank 1 Sensor 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: P2238 2017 Toyota RAV4 indicates A/F Sensor Bank 1 Short Circuit.
Common causes: Common causes include Faulty Air Fuel Ratio (A/F) Sensor Bank 1 Sensor 1, Air Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted, Air Fuel Ratio Sensor Bank 1 Sensor 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 314

How popular is this code, among other codes? Low

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 Mar 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2238 2017 Toyota RAV4 Description

The Air Fuel Ratio (A/F) sensor generates a voltage that corresponds to the actual air-fuel ratio. This sensor voltage is used to provide the Engine Control Module (ECM) with feedback so that it can control the air-fuel ratio. The ECM determines the deviation from the stoichiometric air-fuel ratio level and regulates the fuel injection duration. If the air-fuel ratio sensor malfunctions, the ECM is unable to control the air-fuel ratio accurately.
The air-fuel ratio sensor is a planar type and is integrated with the heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), a current flows into the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are narrow types. The heat generated by the heater is conducted to the solid electrolyte through the alumina, and therefore sensor activation is accelerated.
In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric level.
The Diagnostic Trouble Code (DTC) is set when there is an open or short in the air-fuel ratio sensor circuit, or if the air-fuel ratio sensor output drops. To detect these problems, the voltage of the air-fuel ratio sensor is monitored when turning the ignition switch to ON, and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the air-fuel ratio sensor is between 0.6 V and 4.5 V, it is considered normal. If the voltage is out of the specified range, or the admittance is less than the standard value, the ECM determines that there is a malfunction in the air-fuel ratio sensor. If the same malfunction is detected in the next driving cycle, the MIL is illuminated, and a DTC is stored.

OBDII Code P2238 2017 Toyota RAV4 - A/F Sensor Bank 1 Short Circuit - AutoCodes.com — P2238 2017 Toyota RAV4 Code - A/F Sensor Bank 1 Short Circuit

What does this mean?

What are the Possible Causes of the DTC P2238 2017 Toyota RAV4?

Faulty Air Fuel Ratio (A/F) Sensor Bank 1 Sensor 1
Air Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted
Air Fuel Ratio Sensor Bank 1 Sensor 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2238 2017 Toyota RAV4?

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 P2238 2017 Toyota RAV4 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 P2238 2017 Toyota RAV4 code?

Need more information on how to fix the P2238 2017 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2238 2017 Toyota RAV4 code diagnosed by a professional: Find a repair shop in your area

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 P2238 2017 Toyota RAV4 Code

1. What are the common symptoms of OBDII code P2238 in a 2017 Toyota RAV4?

The common symptoms of code P2238 include poor engine performance, reduced fuel efficiency, rough idling, and the illumination of the check engine light.

2. What does the OBDII code P2238 "A/F Sensor Bank 1 Short Circuit" mean in a 2017 Toyota RAV4?

The code P2238 indicates a malfunction in the Air/Fuel (A/F) sensor on Bank 1 of the engine, specifically pointing to a short circuit in the sensor or its wiring.

3. What are the possible causes of OBDII code P2238 in a 2017 Toyota RAV4?

Common causes of code P2238 include a faulty A/F sensor, damaged sensor wiring or connectors, issues with the sensor heater circuit, or a problem in the engine control module.

4. How can I diagnose the OBDII code P2238 in my 2017 Toyota RAV4?

Diagnosing code P2238 involves using an OBDII scanner to retrieve the code, inspecting the A/F sensor and its wiring for damage, testing the sensor's resistance, and checking the sensor heater circuit.

5. Can I continue driving my 2017 Toyota RAV4 with OBDII code P2238 active?

While the vehicle may still be operable with code P2238, it is advisable to address the issue promptly to prevent potential damage to the engine and ensure optimal performance and fuel efficiency.

6. How can I repair OBDII code P2238 in a 2017 Toyota RAV4?

Repairing code P2238 may involve replacing the faulty A/F sensor, repairing or replacing damaged wiring or connectors, addressing issues with the sensor heater circuit, or reprogramming the engine control module.

7. How much does it cost to fix OBDII code P2238 in a 2017 Toyota RAV4?

The cost of fixing code P2238 can vary depending on the exact cause of the issue, the labor rates in your area, and whether you choose to repair the vehicle yourself or take it to a professional mechanic.

8. Is it possible to prevent OBDII code P2238 in a 2017 Toyota RAV4?

While some causes of code P2238 may be due to normal wear and tear, regular maintenance of the A/F sensor, wiring, and engine control module can help prevent this code from appearing in your vehicle.

9. Can a DIY enthusiast fix OBDII code P2238 in a 2017 Toyota RAV4?

Depending on your skills and experience with automotive repairs, it is possible for a DIY enthusiast to fix code P2238 by following repair guides, utilizing the right tools, and ensuring safety precautions are taken.

10. How long does it take to repair OBDII code P2238 in a 2017 Toyota RAV4?

The repair time for code P2238 can vary based on the exact cause of the issue, the availability of parts, and whether you perform the repair yourself or take the vehicle to a professional, but it typically takes a few hours to complete.