AutoCodes – Honda – P2238 2010 Honda Accord

P2238 2010 Honda Accord Code - Air/Fuel Ratio Sensor 1 Bank 1 Circuit Low Voltage

Quick Answer

The Air/Fuel ratio (A/F) sensor (sensor 1) is installed in the exhaust system and detects oxygen content in the exhaust gas. Common causes include Faulty Air/Fuel Ratio Sensor 1 Bank 1, Air/Fuel Ratio Sensor 1 Bank 1 harness is open or shorted, Air/Fuel Ratio Sensor 1 Bank 1 electrical circuit poor 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 2010 Honda Accord indicates Air/Fuel Ratio Sensor 1 Bank 1 Circuit Low Voltage.
Common causes
Common causes include Faulty Air/Fuel Ratio Sensor 1 Bank 1, Air/Fuel Ratio Sensor 1 Bank 1 harness is open or shorted, Air/Fuel Ratio Sensor 1 Bank 1 electrical circuit poor 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 2,730
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P2238 2010 Honda Accord Description

The Air/Fuel ratio (A/F) sensor (sensor 1) is installed in the exhaust system and detects oxygen content in the exhaust gas. The A/F sensor transmits output voltage to the Powertrain Control Module (PCM). A heater for the sensor element is embedded in the A/F sensor (sensor 1). It heats the sensor to stabilize and speed the detection of oxygen content. The increase in current through the heater levels off as the voltage applied to the electrode reaches a certain range because the amount of oxygen that goes through the diffusion layer is limited. The current is proportional to oxygen content in the exhaust gas, so the air/fuel ratio is detected by the measurement of the current. The PCM compares a set target air/fuel ratio with the detected air/fuel ratio and controls the fuel injection duration. If the A/F sensor (sensor 1) voltage is low, the air/fuel ratio is lean, and the PCM uses A/F feedback control to issue a rich command. If the A/F sensor (sensor 1) voltage is high, the air/fuel ratio is rich, and the PCM uses A/F feedback control to issue a lean command. If the element is not activated or the PCM terminal voltage is a set value or less for a set time when power is drawn to the A/F sensor (sensor 1) heater, a malfunction is detected and a DTC is stored.
OBDII Code P2238 2010 Honda Accord - Air/Fuel Ratio Sensor 1 Bank 1 Circuit Low Voltage - AutoCodes.com
P2238 2010 Honda Accord Code - Air/Fuel Ratio Sensor 1 Bank 1 Circuit Low Voltage

What are the Possible Causes of the DTC P2238 2010 Honda Accord?

  • Faulty Air/Fuel Ratio Sensor 1 Bank 1
  • Air/Fuel Ratio Sensor 1 Bank 1 harness is open or shorted
  • Air/Fuel Ratio Sensor 1 Bank 1 electrical circuit poor connection
  • Vacuum leak
  • Low fuel pressure

How to Fix the DTC P2238 2010 Honda Accord?

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 2010 Honda Accord 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 2010 Honda Accord code?

Need more information on how to fix the P2238 2010 Honda Accord code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2010 Honda Accord Code

1. What are the common symptoms of OBDII code P2238 in a 2010 Honda Accord?

- Common symptoms include poor fuel economy, rough idling, and potential engine stalling.

2. What does the OBDII code P2238 indicate in a 2010 Honda Accord?

- The code P2238 indicates a low voltage condition in the Air/Fuel Ratio Sensor 1 Bank 1 circuit.

3. What are the possible causes of OBDII code P2238 in a 2010 Honda Accord?

- Possible causes include a faulty Air/Fuel Ratio Sensor, damaged wiring or connectors, or an issue with the engine control module.

4. How can I diagnose the OBDII code P2238 in my 2010 Honda Accord?

- Diagnosis typically involves checking the sensor's wiring, connectors, and resistance, as well as performing tests to determine the sensor's functionality.

5. Can I continue driving my 2010 Honda Accord with OBDII code P2238?

- It is not recommended to continue driving with this code as it can lead to poor engine performance and potential damage over time.

6. How do I repair OBDII code P2238 in a 2010 Honda Accord?

- Repair involves replacing the Air/Fuel Ratio Sensor 1 Bank 1 if it is faulty, repairing any damaged wiring or connectors, and clearing the code with a diagnostic tool.

7. Is it possible to reset the OBDII code P2238 in a 2010 Honda Accord without fixing the underlying issue?

- While you can clear the code temporarily, it will likely return if the root cause of the low voltage condition is not addressed.

8. Can a DIY enthusiast fix OBDII code P2238 in a 2010 Honda Accord?

- Depending on your skill level and access to tools, DIY repair is possible for this code by following the manufacturer's service manual and using proper diagnostic equipment.

9. Will OBDII code P2238 cause my 2010 Honda Accord to fail an emissions test?

- Yes, this code can cause your vehicle to fail an emissions test due to the impact on fuel-air mixture control and emissions output.

10. How much does it cost to repair OBDII code P2238 in a 2010 Honda Accord at a professional auto repair shop?

- The repair cost can vary depending on the exact cause of the issue, but it typically ranges from $200 to $500 including parts and labor.

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