P2238 2015 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 2015 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.
Code P2238 2015 Toyota RAV4 Description
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.
What are the Possible Causes of the DTC P2238 2015 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 2015 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 2015 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 2015 Toyota RAV4 code?
Need more information on how to fix the P2238 2015 Toyota RAV4 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P2238 2015 Toyota RAV4 code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P2238 2015 Toyota RAV4 Code
What does the OBDII code P2238 mean on a 2015 Toyota RAV4?
The P2238 code indicates an issue with the Air-Fuel (A/F) Sensor Bank 1, specifically a short circuit in its signal circuit.
What are the common symptoms of P2238 in a 2015 Toyota RAV4?
Symptoms may include a check engine light, poor fuel efficiency, rough idling, reduced engine performance, or difficulty starting the vehicle.
What causes the P2238 code to appear on a 2015 Toyota RAV4?
Typical causes include a faulty A/F sensor, damaged or corroded wiring, a blown fuse, or issues with the engine control module (ECM).
Can a bad A/F sensor cause the P2238 code in a 2015 Toyota RAV4?
Yes, a malfunctioning A/F sensor is one of the primary causes of this code.
How do I diagnose the P2238 code on a Toyota RAV4?
Start by inspecting the A/F sensor wiring for damage or corrosion, check the sensor itself, and test the circuit for continuity or shorts using a multimeter.
Can I drive my 2015 Toyota RAV4 with the P2238 code?
It’s not recommended, as driving with this code can lead to poor performance, increased emissions, and potential damage to other components like the catalytic converter.
How do I fix the P2238 code on a 2015 Toyota RAV4?
Repairs might include replacing the A/F sensor, repairing or replacing damaged wiring, or addressing any issues with the ECM.
How much does it cost to fix the P2238 code in a 2015 Toyota RAV4?
The repair cost will vary, but replacing an A/F sensor typically costs between $200-$400, including parts and labor.
Can a dirty air filter trigger the P2238 code on my RAV4?
A dirty air filter is unlikely to directly cause this code but can contribute to poor air-fuel ratio readings, which may exacerbate related issues.
Do I need to reset the ECM after fixing the P2238 code on my 2015 Toyota RAV4?
Yes, after repairs, the ECM should be reset using an OBDII scanner to clear the code and verify the issue is resolved.
Discuss the causes and fixes for P2238 2015 Toyota RAV4 OBDII Code
Code P2238 2015 Toyota RAV4 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
