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P2238 2008 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 2008 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 2,683
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P2238 2008 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 2008 Honda Accord - Air/Fuel Ratio Sensor 1 Bank 1 Circuit Low Voltage - AutoCodes.com
P2238 2008 Honda Accord Code - Air/Fuel Ratio Sensor 1 Bank 1 Circuit Low Voltage
What does this mean?

What are the Possible Causes of the DTC P2238 2008 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 2008 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 2008 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 2008 Honda Accord code?

Need more information on how to fix the P2238 2008 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 2008 Honda Accord Code

1. What does the OBDII code P2238 mean on a 2008 Honda Accord?

P2238 indicates an issue with the Air/Fuel Ratio Sensor 1 Bank 1 circuit, specifically low voltage being detected.

2. What are the symptoms of code P2238 in a 2008 Honda Accord?

Common symptoms include the check engine light turning on, reduced fuel efficiency, poor engine performance, and rough idling.

3. What causes the P2238 code in a 2008 Honda Accord?

Potential causes include a faulty air/fuel ratio sensor, damaged wiring or connectors, or issues with the powertrain control module (PCM).

4. Can I drive my 2008 Honda Accord with a P2238 code?

While the car may still be drivable, prolonged driving with this code can lead to decreased performance and possible damage to the catalytic converter.

5. How do I diagnose the P2238 code on a 2008 Honda Accord?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the air/fuel ratio sensor and its wiring, and testing the sensor's voltage output with a multimeter.

6. How do I fix the P2238 code on a 2008 Honda Accord?

Repairs may include replacing the air/fuel ratio sensor, repairing or replacing damaged wiring, or reprogramming/updating the PCM if needed.

7. How much does it cost to fix the P2238 code?

Repair costs can range from $150 to $400, depending on whether the air/fuel ratio sensor needs replacement or if wiring repairs are necessary.

8. What is the air/fuel ratio sensor, and why is it important?

The air/fuel ratio sensor monitors the oxygen content in the exhaust to ensure optimal fuel mixture for efficient combustion and reduced emissions.

9. Can a bad battery cause the P2238 code in a 2008 Honda Accord?

While unlikely, a weak or failing battery can sometimes cause voltage-related sensor issues. Testing the battery and alternator is recommended.

10. Will clearing the P2238 code fix the problem?

Clearing the code may temporarily turn off the check engine light, but if the underlying issue isn’t resolved, the code will return.

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