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

Quick Answer

The P1174 code for Honda vehicles indicates that the Air/Fuel (AF) sensor 21 circuit is reading out of range high. Common causes include Faulty AF sensor, Wiring issues or poor connections, 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 Honda indicates AF Sensor 21 Circuit Out Of Range High.
Common causes
Common causes include Faulty AF sensor, Wiring issues or poor connections, 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 06, 2024
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Code P1174 Honda Description

The P1174 code for Honda vehicles indicates that the Air/Fuel (AF) sensor 21 circuit is reading out of range high. This sensor plays a crucial role in monitoring the air-fuel ratio in the engine and providing feedback to the engine control module for optimal combustion. When the sensor detects that the air-fuel mixture is too rich, it sends a signal to the ECU to adjust the fuel delivery accordingly. If the sensor is reading out of range high, it means that the air-fuel mixture is likely too lean, which can lead to poor engine performance, decreased fuel efficiency, and increased emissions.

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

Common Causes of P1174 Honda

  1. Faulty AF sensor
  2. Wiring issues or poor connections
  3. Vacuum leaks
  4. Exhaust system leaks
  5. Issues with the fuel system

Symptoms of P1174 Honda

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

How to Fix P1174 Honda

  1. Diagnose the AF sensor and circuit with a scan tool to pinpoint the exact issue.
  2. Inspect the wiring and connections for any signs of damage or corrosion.
  3. Check for vacuum leaks and repair as necessary.
  4. Inspect the exhaust system for leaks and repair or replace damaged components.
  5. Test the fuel system components for proper functioning and address any issues.

Cost to Fix P1174 Honda

The cost of repairing a P1174 code on a Honda vehicle can vary depending on the specific cause of the issue. In general, you can expect to pay anywhere from $200 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates at repair shops can impact the final cost, so it's advisable to get quotes from multiple shops in your area.

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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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