AutoCodes – Honda – P2238 2009 Honda Accord

P2238 2009 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 2009 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 3,279

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2238 2009 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 2009 Honda Accord - Air/Fuel Ratio Sensor 1 Bank 1 Circuit Low Voltage - AutoCodes.com — P2238 2009 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 2009 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 2009 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 2009 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 2009 Honda Accord code?

Need more information on how to fix the P2238 2009 Honda Accord code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2238 2009 Honda Accord 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 2009 Honda Accord Code

1. What are the common symptoms of OBDII code P2238 on a 2009 Honda Accord?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and a noticeable decrease in engine performance.

2. What can cause the OBDII code P2238 on a 2009 Honda Accord?

- The code P2238 is typically triggered by a faulty Air/Fuel Ratio Sensor 1 Bank 1, damaged wiring or connectors, or an exhaust system leak.

3. How should I diagnose the cause of OBDII code P2238 on my 2009 Honda Accord?

- To diagnose the issue, you can perform a visual inspection of the sensor and its connections, test the sensor's voltage output, and check for any exhaust leaks or damage.

4. Is it safe to continue driving my 2009 Honda Accord with OBDII code P2238?

- It is not recommended to continue driving with the code P2238 as it can lead to further engine damage and decreased fuel efficiency.

5. Can I repair OBDII code P2238 on my 2009 Honda Accord myself?

- The repair for code P2238 usually involves replacing the Air/Fuel Ratio Sensor 1 Bank 1. While it can be done at home, it is recommended to seek professional help for proper installation and calibration.

6. How much does it cost to repair OBDII code P2238 on a 2009 Honda Accord?

- The cost of repairing code P2238 can vary depending on the labor rates in your area, the cost of the sensor, and any additional parts or repairs needed. It is best to get a quote from a trusted mechanic.

7. Can a faulty Air/Fuel Ratio Sensor 1 Bank 1 cause other issues in a 2009 Honda Accord?

- Yes, a faulty sensor can cause other issues such as poor engine performance, increased emissions, and potential damage to other engine components over time.

8. How long does it take to repair OBDII code P2238 on a 2009 Honda Accord?

- The repair for code P2238 typically takes about 1-2 hours to complete, but this can vary based on the mechanic's experience and workload.

9. Will resetting the OBDII code P2238 on my 2009 Honda Accord make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not fixed, the code is likely to reappear.

10. Are there any preventive measures to avoid OBDII code P2238 on a 2009 Honda Accord?

- Regular maintenance, such as checking and replacing the Air/Fuel Ratio Sensor 1 Bank 1 as recommended by the manufacturer, can help prevent the occurrence of code P2238.