P2238 Toyota 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 Toyota 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 Toyota 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 Toyota?
- 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 Toyota?
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.
Code Tech Notes
2004 Toyota Sienna
2004 Toyota Sienna Factory Service Bulletin OBDII Code P2238
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2238 Toyota 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 Toyota code?
Need more information on how to fix the P2238 Toyota code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P2238 Toyota code diagnosed by a professional: Find a repair shop in your area
Information for Specific Toyota Models
- P2238 2006 Toyota Camry — Oxygen A/F Sensor Pumping Current Circuit Low Bank 1 Sensor 1
- P2238 2007 Toyota Camry — Oxygen A/F Sensor Pumping Current Circuit Low Bank 1 Sensor 1
- P2238 2008 Toyota Camry — Oxygen A/F Sensor Pumping Current Circuit Low Bank 1 Sensor 1
- P2238 2009 Toyota Camry — Oxygen A/F Sensor Pumping Current Circuit Low Bank 1 Sensor 1
- P2238 2010 Toyota Camry — Oxygen A/F Sensor Pumping Current Circuit Low Bank 1 Sensor 1
- P2238 2011 Toyota Camry — Oxygen A/F Sensor Pumping Current Circuit Low Bank 1 Sensor 1
- P2238 2001 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2238 2002 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2238 2003 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2238 2004 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2238 2005 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2238 2006 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2238 2007 Toyota Highlander — A/F Sensor Bank 1 Short Circuit
- P2238 2004 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2238 2005 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2238 2006 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2238 2007 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2238 2008 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2238 2009 Toyota Prius — Oxygen A/F Sensor Reference Ground Circuit High Bank 1 Sensor 1
- P2238 2013 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
- P2238 2014 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
- P2238 2015 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
- P2238 2016 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
- P2238 2017 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
- P2238 2018 Toyota RAV4 — A/F Sensor Bank 1 Short Circuit
Frequently Asked Questions about P2238 Toyota Code
1. What are the common symptoms of OBDII code P2238 (A/F Sensor Bank 1 Short Circuit) in a Toyota vehicle?
- Common symptoms of P2238 may include poor engine performance, decreased fuel efficiency, rough idling, and illuminated Check Engine Light.
2. What are the possible causes of OBDII code P2238 in a Toyota, indicating an A/F Sensor Bank 1 Short Circuit?
- The code P2238 can be triggered by issues such as a faulty air/fuel ratio sensor, damaged wiring or connectors, or a malfunctioning Engine Control Module (ECM).
3. How can I diagnose the A/F Sensor Bank 1 Short Circuit issue related to code P2238 in my Toyota?
- To diagnose P2238, you can use an OBDII scanner to retrieve the code, visually inspect the sensor and its wiring for any visible damage, and perform circuit tests to identify the short circuit.
4. Can a dirty air filter cause OBDII code P2238 in a Toyota vehicle?
- While a dirty air filter itself may not directly cause P2238, it can lead to poor engine performance and potentially trigger the code due to incorrect air-to-fuel ratio readings.
5. Is it safe to continue driving with OBDII code P2238 (A/F Sensor Bank 1 Short Circuit) in my Toyota?
- It is not recommended to drive with an unresolved P2238 code, as it can lead to further engine damage and potential safety hazards. It's best to address the issue promptly.
6. Are there any DIY repair tips for fixing OBDII code P2238 in a Toyota related to the A/F Sensor Bank 1 Short Circuit?
- DIY repair tips for P2238 may include checking and cleaning sensor connectors, inspecting and repairing damaged wiring, and replacing the air/fuel ratio sensor if necessary.
7. How much does it typically cost to repair OBDII code P2238 (A/F Sensor Bank 1 Short Circuit) in a Toyota at a professional auto repair shop?
- The cost of repairing P2238 can vary depending on the cause of the issue, but it generally ranges from $200 to $500 at a professional auto repair shop, including parts and labor.
8. Can a failing oxygen sensor trigger OBDII code P2238 in a Toyota vehicle?
- Yes, a failing oxygen sensor can cause incorrect air/fuel ratio readings and potentially trigger code P2238, indicating an A/F Sensor Bank 1 Short Circuit.
9. Will resetting the Check Engine Light resolve OBDII code P2238 (A/F Sensor Bank 1 Short Circuit) in my Toyota?
- Resetting the Check Engine Light may temporarily clear the code, but if the underlying issue causing P2238 is not addressed, the code is likely to reappear after driving cycles.
10. How long does it take to repair OBDII code P2238 (A/F Sensor Bank 1 Short Circuit) in a Toyota?
- The repair time for P2238 can vary based on the specific cause of the issue and the extent of the repair needed, but it typically takes 1 to 2 hours at a professional auto repair shop.
Discuss the causes and fixes for P2238 Toyota OBDII Code
-
My name is azeez im having issues with my car toyota camry 2004 fuel consumption.it was scanned code P2238.pls help me hw to fix it.
-
Hi. I have a problem with my Camry 2007 le 2.4l engine, the scan shows the code p2238,I replaced the a/f sensor part#89467-06030 with a new one with the number 234-9041 and the problem didn't fixed! The new scan shows the codes p0031, p2239, p2252 and I don't know what to do next! I searched throat the net and all my problems related to the a/f sensor.
Should I try a new sensor with the exact part number?!
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
