AutoCodes – Acura – P2237 Acura

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

Quick Answer

The rear air/fuel ratio (A/F) sensor (bank 1, sensor 1) is installed in the exhaust manifold and detects oxygen content in the exhaust gas. Common causes include Air/Fuel Ratio Sensor Bank 1 harness is open or shorted, Air/Fuel Ratio Sensor Bank 1 circuit poor electrical connection, Faulty Air/Fuel Ratio Sensor Bank 1. 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 Air/Fuel Ratio Sensor Bank 1 harness is open or shorted, Air/Fuel Ratio Sensor Bank 1 circuit poor electrical connection, Faulty Air/Fuel Ratio Sensor Bank 1.
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 15,084

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2237 Acura Description

The rear air/fuel ratio (A/F) sensor (bank 1, sensor 1) is installed in the exhaust manifold and detects oxygen content in the exhaust gas. The rear A/F sensor transmits output voltage to the Powertrain Control Module (PCM). The PCM controls fuel injection duration by comparing the target air/fuel ratio with the rear A/F sensor signal. The sensor includes the VS cell, the pump cell, the atmospheric reference cavity, the diffusion layer, and the heater, and it enables overall feedback control.

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

What does this mean?

What are the Possible Causes of the DTC P2237 Acura?

Air/Fuel Ratio Sensor Bank 1 harness is open or shorted
Air/Fuel Ratio Sensor Bank 1 circuit poor electrical connection
Faulty Air/Fuel Ratio Sensor Bank 1
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

How to Fix the DTC P2237 Acura?

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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2237 Acura 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.

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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 $200â€“$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.