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Engine-Codes – Honda – P0112 1999 Honda Civic

P0112 1999 Honda Civic Code - Intake Air Temperature Circuit Low Voltage

Quick Answer

The P0112 code for a 1999 Honda Civic indicates a problem with the Intake Air Temperature (IAT) sensor circuit, specifically reporting low voltage. Common causes include Faulty Intake Air Temperature (IAT) sensor, Damaged wiring or connectors in the IAT sensor circuit, Corrosion or poor connections in the sensor circuit. 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
P0112 1999 Honda Civic indicates Intake Air Temperature Circuit Low Voltage.
Common causes
Common causes include Faulty Intake Air Temperature (IAT) sensor, Damaged wiring or connectors in the IAT sensor circuit, Corrosion or poor connections in the sensor circuit.
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 14, 2024
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Code P0112 1999 Honda Civic Description

The P0112 code for a 1999 Honda Civic indicates a problem with the Intake Air Temperature (IAT) sensor circuit, specifically reporting low voltage. The IAT sensor is responsible for measuring the temperature of the air entering the engine. This information is crucial for the engine control unit (ECU) to adjust the air-fuel mixture for optimal combustion. When the voltage from the IAT sensor is lower than expected, it can lead to incorrect fuel delivery, affecting the engine's performance and efficiency.

OBDII Code P0112 1999 Honda Civic - Intake Air Temperature Circuit Low Voltage
P0112 1999 Honda Civic Code - Intake Air Temperature Circuit Low Voltage

Common Causes of P0112 1999 Honda Civic

  1. Faulty Intake Air Temperature (IAT) sensor
  2. Damaged wiring or connectors in the IAT sensor circuit
  3. Corrosion or poor connections in the sensor circuit
  4. Issues with the Engine Control Unit (ECU)
  5. Intake air leaks affecting sensor readings

Symptoms of P0112 1999 Honda Civic

  1. Decreased fuel efficiency
  2. Engine running rough or misfiring
  3. Engine stalling or hesitation
  4. Check Engine Light illuminated
  5. Reduced engine power

How to Fix P0112 1999 Honda Civic

  1. Begin by locating the IAT sensor in the intake air duct or manifold.
  2. Inspect the sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the sensor using a multimeter to check for proper resistance and voltage readings.
  4. If the sensor is faulty, replace it with a new one following manufacturer guidelines.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0112 1999 Honda Civic

The cost of repairing a P0112 code on a 1999 Honda Civic can vary depending on the specific cause of the issue. In general, the cost of a new IAT sensor ranges from $20 to $50, while labor costs for diagnosis and replacement can range from $80 to $150 per hour. Overall, the total repair cost for this issue may range from $100 to $300, including parts and labor. It is advisable to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your location and vehicle specifics.

When is the Code Detected?

An excessively low voltage from the sensor is sent to ECM.

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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 P0112 1999 Honda Civic Code

1. What are the common symptoms of OBDII code P0112 on a 1999 Honda Civic?

- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.

2. What causes the intake air temperature circuit to register low voltage in a 1999 Honda Civic?

- Possible causes include a faulty intake air temperature sensor, damaged wiring or connectors, or a problem with the Engine Control Module (ECM).

3. How can I diagnose the intake air temperature sensor on my 1999 Honda Civic to verify if it's causing the P0112 code?

- Use a multimeter to test the sensor's resistance, check for proper voltage supply, and inspect the sensor's wiring and connector for any signs of damage.

4. Can a dirty air filter trigger the P0112 code on a 1999 Honda Civic?

- Yes, a heavily clogged air filter can disrupt the intake air temperature readings and potentially lead to the P0112 code.

5. What are some DIY repair tips for addressing the P0112 code on a 1999 Honda Civic?

- Check and clean the intake air temperature sensor, inspect and repair any damaged wiring, and ensure the air filter is clean and properly installed.

6. Is it safe to continue driving a 1999 Honda Civic with the P0112 code triggered?

- It is not recommended to drive the vehicle with the P0112 code active, as it can lead to further engine problems and potential safety hazards.

7. Can resetting the OBDII system clear the P0112 code on a 1999 Honda Civic?

- Resetting the system may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to reappear after driving the vehicle.

8. How much does it typically cost to repair the intake air temperature circuit low voltage issue on a 1999 Honda Civic?

- The cost of repairing the P0112 code can vary depending on the exact cause, but it may range from $100 to $300 for parts and labor.

9. Will the P0112 code prevent my 1999 Honda Civic from passing a state emissions test?

- Yes, the P0112 code can cause your vehicle to fail an emissions test, as it indicates a problem with the intake air temperature circuit.

10. Can a mechanic easily fix the P0112 code on a 1999 Honda Civic, or is it a complex repair?

- A qualified mechanic should be able to diagnose and repair the issue causing the P0112 code, as long as they have the necessary tools and expertise in automotive diagnostics.

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