P0079 - Intake Air Temperature Sensor Range/Performance Problem (Common in 2014-2016 Ford F-150)

Quick Answer

P0079 means: P0079 refers to a malfunction with the intake air temperature sensor, indicating incorrect temperature readings.

Fix: Check and replace faulty components Cost: $100 - $250 Time: 90-180 minutes

Can I drive with P0079? Immediate attention is recommended to prevent further engine issues.

Common Questions

What does P0079 mean and how does it affect my car?

The P0079 code indicates a problem with the intake air temperature sensor, which plays a crucial role in determining the air-fuel mixture for optimal engine performance. If this sensor is giving incorrect readings, it could lead to poor fuel economy and performance issues like stalling or rough idling. Long-term neglect of this code can lead to more severe engine problems and higher emissions.

What are the most common causes of P0079 and how much does it cost to fix?

The most common cause of P0079 is a faulty intake air temperature sensor, which accounts for about 70% of cases. Repairing or replacing the sensor typically costs between $100 and $250. Other causes include wiring issues and contaminants in the sensor, which can also be addressed with costs ranging from $50 to $150.

Can I drive my car with P0079 or should I stop immediately?

While you may be able to drive with a P0079 code, it is not advisable to ignore it. The symptoms can worsen, leading to more severe engine performance issues and potential damage. It's best to have the issue addressed as soon as possible to maintain the reliability and efficiency of your vehicle.

How can I diagnose P0079 myself using GeekOBD APP?

To diagnose P0079 with the GeekOBD APP, start by connecting the app to your vehicle's OBD2 port. Use the app to retrieve diagnostic trouble codes and examine freeze frame data. You can also monitor real-time data from the intake air temperature sensor to see if it falls within the expected range while the engine is running.

What vehicles are most commonly affected by P0079?

P0079 is commonly reported in vehicles such as the 2014-2016 Ford F-150, Toyota Camry (2012-2014), and Honda Accord (2013-2015). These models may have known issues related to the intake air temperature sensor, but it's always good to check for any recalls or technical service bulletins (TSBs).

How can I prevent P0079 from happening again?

To prevent the P0079 code from reappearing, ensure regular maintenance of your vehicle, including cleaning the air intake system. Periodically inspect the intake air temperature sensor and its wiring for any signs of wear or damage. Keeping the engine and its components clean will also help maintain proper function.

What is P0079?

The diagnostic trouble code (DTC) P0079 indicates an issue with the intake air temperature (IAT) sensor, which measures the temperature of the air entering the engine. This code is triggered when the Engine Control Module (ECM) detects that the IAT sensor's input is outside the expected range or performance parameters. In practical terms, this could mean that the sensor is providing readings that are too high or too low, which can affect engine performance, fuel efficiency, and emissions. For many vehicles, such as the 2014-2016 Ford F-150, this can lead to a rough idle, stalling, or decreased acceleration. Ignoring this code can result in more significant engine problems down the road, as the engine management system relies on accurate input from the IAT sensor to optimize fuel delivery and ignition timing. The P0079 code is a serious warning that should not be overlooked, as it can lead to increased emissions and potential engine damage if left unaddressed.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0079 is present:

  • Check engine light illuminates and remains lit, indicating a fault detected by the ECM.
  • Engine performance issues such as stalling at idle or rough idling, making the vehicle feel less responsive.
  • Decreased fuel economy, potentially losing 10-20% efficiency due to improper air-fuel mixture.
  • Poor acceleration response, leading to hesitation when pressing the gas pedal, especially noticeable during merging or uphill driving.
  • Unusual engine sounds like knocking or pinging, which can occur due to incorrect air-fuel mixture.

Possible Causes

Most common causes of P0079 (ordered by frequency):

  1. Faulty intake air temperature sensor (70% likelihood) - The sensor may be damaged or malfunctioning, leading to incorrect readings.
  2. Wiring issues (15% likelihood) - Damaged or corroded wiring and connectors can disrupt the signal sent to the ECM.
  3. Contaminants in the sensor (10% likelihood) - Dirt or debris may affect sensor performance, leading to erratic readings.
  4. ECM software glitches (3% likelihood) - Rarely, the engine control module itself may require reprogramming or updating.
  5. Sensor mounting issues (2% likelihood) - If the sensor is improperly installed or loose, it may give false readings.

P0079 Repair Costs

Cost Breakdown by Repair Type

IAT Sensor Replacement

Replacing the faulty intake air temperature sensor with a new part and ensuring proper installation.

  • Total: $100 - $250
  • Success rate: 90%
Wiring Repair

Repairing damaged wiring or connectors to ensure a proper signal to the ECM.

  • Total: $50 - $150
  • Success rate: 85%
Money-Saving Tips for P0079
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P0079 Diagnosis Process

Follow these systematic steps to accurately diagnose P0079. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for any visible damage to the intake air temperature sensor, wiring harness, and connectors for signs of wear or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for any visible damage to the intake air temperature sensor, wiring harness, and connectors for signs of wear or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Utilize the GeekOBD APP to retrieve diagnostic trouble codes and examine freeze frame data to gather context for the P0079 fault (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Utilize the GeekOBD APP to retrieve diagnostic trouble codes and examine freeze frame data to gather context for the P0079 fault (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter to test the resistance of the IAT sensor

Step 3: Component testing - Use a multimeter to test the resistance of the IAT sensor. Compare the readings against the manufacturer's specifications to determine sensor functionality (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - After repairs, verify the proper operation of the IAT sensor by running the engine and monitoring the sensor's data with the GeekOBD APP to ensure it provides accurate readings (10-15 minutes)

Step 4: System function test - After repairs, verify the proper operation of the IAT sensor by running the engine and monitoring the sensor's data with the GeekOBD APP to ensure it provides accurate readings (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the P0079 code does not reappear and that performance has improved (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the P0079 code does not reappear and that performance has improved (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: 2015 Ford F-150 IAT Sensor Replacement

Vehicle: 2015 Ford F-150, 75,000 miles

Problem: Customer reported check engine light and rough idling.

Diagnosis: Performed OBD2 scan using GeekOBD APP and retrieved P0079 code. Visual inspection revealed a damaged IAT sensor.

Solution: Replaced the intake air temperature sensor and cleared the codes.

Cost: $180 (sensor $120, labor $60)

Result: Customer reported improved engine performance and no reappearance of the check engine light.

Case Study 2: 2013 Honda Accord Wiring Repair

Vehicle: 2013 Honda Accord, 90,000 miles

Problem: Check engine light on and decreased fuel efficiency.

Diagnosis: OBD2 scan showed P0079 code; inspection revealed corroded wiring leading to the IAT sensor.

Solution: Repaired the wiring and replaced damaged connectors.

Cost: $100 (wiring repair $50, labor $50)

Result: Post-repair, the vehicle's fuel efficiency improved, and the engine light remained off.

Diagnose P0079

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: P0079
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes