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P1174 Acura Code - AF Sensor 21 Circuit Out Of Range High

Quick Answer

The P1174 Acura code indicates that the Air/Fuel (AF) sensor 21 circuit is reading an out of range high signal. Common causes include Faulty AF sensor, Wiring issues, Vacuum leaks. 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
P1174 Acura indicates AF Sensor 21 Circuit Out Of Range High.
Common causes
Common causes include Faulty AF sensor, Wiring issues, Vacuum leaks.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1174 Acura Description

The P1174 Acura code indicates that the Air/Fuel (AF) sensor 21 circuit is reading an out of range high signal. The AF sensor, also known as the oxygen sensor, plays a critical role in monitoring the oxygen levels in the exhaust gases and adjusting the air-fuel mixture accordingly. When the AF sensor 21 circuit is out of range high, it means that the sensor is reading a signal that is too high compared to the expected values. This can lead to an imbalance in the air-fuel mixture, potentially causing poor engine performance, reduced fuel efficiency, and increased emissions.

OBDII Code P1174 Acura - AF Sensor 21 Circuit Out Of Range High
P1174 Acura Code - AF Sensor 21 Circuit Out Of Range High

Common Causes of P1174 Acura

  1. Faulty AF sensor
  2. Wiring issues
  3. Vacuum leaks
  4. Fuel system problems
  5. Exhaust leaks

Symptoms of P1174 Acura

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Engine misfires
  4. Check Engine Light illuminated
  5. Reduced engine performance

How to Fix P1174 Acura

  1. Diagnose the AF sensor 21 circuit using a scan tool to pinpoint the exact issue.
  2. Inspect the wiring harness for any damage or corrosion and repair or replace as necessary.
  3. Check for vacuum leaks and address any leaks found.
  4. Test the fuel system components, such as the fuel pump and fuel injectors, for proper operation.
  5. Replace the AF sensor if it is determined to be faulty.

Cost to Fix P1174 Acura

The cost of repairing the P1174 Acura code can vary depending on the exact cause of the issue and the specific components that need to be replaced. In general, the cost of replacing an AF sensor can range from $200 to $400, including parts and labor. Additional costs may be incurred if other components need to be repaired or replaced. It's essential to consult with a qualified mechanic to get an accurate estimate based on your vehicle's make and model.

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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.

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