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P2237 Acura Code - Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage

Quick Answer

The P2237 diagnostic trouble code (DTC) for Acura vehicles indicates an issue with the Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage. Common causes include Faulty rear air/fuel ratio sensor, Wiring or electrical issues, ECM malfunction. 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
P2237 Acura indicates Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage.
Common causes
Common causes include Faulty rear air/fuel ratio sensor, Wiring or electrical issues, ECM malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P2237 Acura Description

The P2237 diagnostic trouble code (DTC) for Acura vehicles indicates an issue with the Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage. This sensor plays a crucial role in monitoring the air-to-fuel ratio in the exhaust system of the vehicle. The sensor is located before the catalytic converter and is responsible for sending signals to the engine control module (ECM) to adjust the fuel mixture for optimal combustion efficiency.

OBDII Code P2237 Acura - Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage
P2237 Acura Code - Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage

Common Causes of P2237 Acura

  1. Faulty rear air/fuel ratio sensor
  2. Wiring or electrical issues
  3. ECM malfunction
  4. Exhaust system leaks
  5. Contaminated fuel

Symptoms of P2237 Acura

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Check Engine Light illuminated
  4. Increased emissions
  5. Engine misfires

How to Fix P2237 Acura

  1. Use an OBD-II scanner to confirm the P2237 code.
  2. Inspect the rear air/fuel ratio sensor for any visible damage or contamination.
  3. Check the wiring harness for any signs of wear, fraying, or damage.
  4. Test the ECM to ensure it is functioning correctly.
  5. Replace the rear air/fuel ratio sensor if it is found to be faulty, and repair any wiring issues if necessary.

Cost to Fix P2237 Acura

The typical repair costs for addressing the P2237 code on an Acura vehicle can range from $200 to $500, depending on the specific components that need to be replaced and the labor charges. It is important to note that prices may vary based on the location of the repair shop, the vehicle's make and model, and the engine type. Additionally, diagnostic time and labor rates at auto repair shops can fluctuate, so it is advisable to inquire about local rates for a more accurate estimate.

What does this mean?

Tech Notes for P2237 Acura

For the following Acura models to fix this problem, check the sensor wiring and connections for damage. If the sensor circuit is OK, and the DTC(s) come back after clearing them and doing a short test-drive, replace the A/F sensor. The replacement A/F sensors in Honda parts stock are an improved version over the original sensor.

When is the Code Detected?

If the IPB 1 terminal voltage is out of a specified range, the PCM detects a malfunction and stores a DTC.

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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 P2237 Acura Code

1. What does the OBDII code P2237 mean on an Acura?

P2237 indicates a problem with the Rear Air/Fuel Ratio Sensor (Bank 1, Sensor 1), specifically a high voltage issue in the IP (current pump) circuit.

2. What are common symptoms of code P2237 in an Acura?

Symptoms may include a check engine light, poor fuel economy, rough idling, hesitation during acceleration, or failure to pass emissions tests.

3. What causes the P2237 code on an Acura?

Common causes include a faulty air/fuel ratio sensor, damaged wiring or connections, a malfunctioning ECM, or issues with the exhaust system that affect sensor readings.

4. How can I diagnose the P2237 code on my Acura?

Inspect the air/fuel ratio sensor and its wiring for damage, check for exhaust leaks, use a multimeter to test the sensor, and scan live data with an OBDII scanner to confirm sensor performance.

5. Can I drive my Acura with the P2237 code?

It is possible to drive for a short time, but doing so may lead to reduced performance, increased fuel consumption, and potential damage to other components, such as the catalytic converter.

6. How do I fix the P2237 code on my Acura?

Repairs might involve replacing the air/fuel ratio sensor, repairing damaged wiring or connectors, inspecting and fixing exhaust leaks, or reprogramming or replacing the ECM if necessary.

7. How much does it cost to repair the P2237 code on an Acura?

The cost varies depending on the repair, with air/fuel ratio sensor replacements typically costing $200–$400, including parts and labor.

8. Is the air/fuel ratio sensor the same as an oxygen sensor?

No, the air/fuel ratio sensor is more advanced and provides more precise measurements, though it performs a similar function to monitor and adjust the air-fuel mixture.

9. What is Bank 1, Sensor 1 in my Acura?

Bank 1 refers to the side of the engine with cylinder 1, and Sensor 1 is the upstream sensor located before the catalytic converter.

10. Can a dirty air filter cause the P2237 code?

While unlikely, a severely clogged air filter can disrupt the air-fuel mixture, potentially affecting sensor readings. Regular maintenance can help prevent related issues.

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