AutoCodes – Acura – P1157 Acura

P1157 Acura Code - Air/Fuel Ratio Sensor 1 Range/Performance Problem

Quick Answer

The Air/Fuel Ratio (A/F) 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, Air/Fuel Ratio Sensor 1 harness is open or shorted, Air/Fuel Ratio Sensor 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1157 Acura indicates Air/Fuel Ratio Sensor 1 Range/Performance Problem.
Common causes: Common causes include Faulty Air/Fuel Ratio Sensor 1, Air/Fuel Ratio Sensor 1 harness is open or shorted, Air/Fuel Ratio Sensor 1 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 16,291

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 24, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1157 Acura Description

The Air/Fuel Ratio (A/F) 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 Engine Control Module (ECM). A heater for the sensor element is embedded in the A/F sensor (sensor 1). It is activated and heats the sensor to stabilize and speed the detection of oxygen content by controlling current flowing through the heater. An increase in the current levels off as the applied voltage to the element electrode reaches a certain range because the amount of oxygen which is led through the diffusion layer is limited. The current amperage is proportional to oxygen content in the exhaust gas, so the air/fuel ratio is detected by the measurement of the current amperage. The ECM compares a set target air/fuel ratio with the detected air/fuel ratio and controls the fuel injection timing.
If the A/F sensor (sensor 1) voltage is low, the air/fuel ratio is lean, and the ECM 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 ECM uses A/F feedback control to issue a Lean command.

OBDII Code P1157 Acura - Air/Fuel Ratio Sensor 1 Range/Performance Problem - AutoCodes.com — P1157 Acura Code - Air/Fuel Ratio Sensor 1 Range/Performance Problem

What does this mean?

What are the Possible Causes of the DTC P1157 Acura?

Faulty Air/Fuel Ratio Sensor 1
Air/Fuel Ratio Sensor 1 harness is open or shorted
Air/Fuel Ratio Sensor 1 circuit poor electrical connection

How to Fix the DTC P1157 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1157 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.

Need more information about the P1157 Acura 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 P1157 Acura Code

1. What are the common symptoms of OBDII code P1157 in an Acura related to the Air/Fuel Ratio Sensor 1 Range/Performance Problem?

The common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and an illuminated check engine light.

2. What are the possible causes of OBDII code P1157 in an Acura?

The code P1157 in an Acura is typically triggered by a faulty Air/Fuel Ratio Sensor, vacuum leaks, exhaust system leaks, or issues with the engine's air intake system.

3. How can I diagnose the Air/Fuel Ratio Sensor 1 Range/Performance Problem in my Acura?

To diagnose the issue, you can use an OBDII scanner to read the fault codes, visually inspect the sensor and its wiring for any damage, and perform a voltage test on the sensor to check its functionality.

4. Can I still drive my Acura with OBDII code P1157 present?

While it may be possible to drive your Acura with the code present, it is not recommended as it can lead to further damage to the vehicle and may result in decreased performance and fuel efficiency.

5. How do I repair OBDII code P1157 in my Acura?

The most common repair for this code is to replace the Air/Fuel Ratio Sensor 1. It is important to use a genuine OEM sensor for proper functionality.

6. Are there any DIY tips for fixing the Air/Fuel Ratio Sensor 1 Range/Performance Problem in my Acura?

If you are comfortable with automotive repairs, you can attempt to replace the sensor yourself using basic tools. However, if you are unsure, it is best to seek professional help.

7. Can a dirty air filter cause OBDII code P1157 in an Acura?

Yes, a dirty air filter can affect the air/fuel mixture in the engine, which may indirectly lead to the triggering of code P1157. Make sure to check and replace the air filter if necessary.

8. How long does it take to replace the Air/Fuel Ratio Sensor 1 in an Acura?

The replacement of the Air/Fuel Ratio Sensor 1 in an Acura typically takes around 1-2 hours, depending on the model and the accessibility of the sensor.

9. Will resetting the check engine light clear OBDII code P1157 in my Acura?

Resetting the check engine light may temporarily turn it off, but if the underlying issue causing code P1157 is not fixed, the light will likely come back on after some driving cycles.

10. Is it safe to ignore OBDII code P1157 in my Acura?

Ignoring OBDII code P1157 can lead to reduced fuel efficiency, engine performance issues, and potential damage to other components. It is recommended to address the underlying problem as soon as possible.