P0071 - Understanding DTC P0071: Intake Air Temperature Sensor Circuit Range/Performance Problem

Quick Answer

P0071 means: P0071 indicates a problem with the intake air temperature sensor circuit.

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

Can I drive with P0071? It's advisable to address this issue promptly to avoid decreased engine performance and potential long-term damage.

Common Questions

What does P0071 mean and how does it affect my car?

P0071 indicates there’s a performance issue with the intake air temperature sensor. If this sensor fails, your car may experience poor fuel efficiency, rough idle, or even stalling. It’s essential to address this issue promptly to maintain optimal vehicle performance and avoid further damage.

What are the most common causes of P0071 and how much does it cost to fix?

The main causes of P0071 often include a faulty intake air temperature sensor, which can typically be replaced for $100-$250. Wiring issues account for about 25% of cases and may cost around $50-$150 for repairs. If the ECM is faulty, reprogramming or replacement can range from $300 to $1,200.

Can I drive my car with P0071 or should I stop immediately?

While it’s possible to drive with the P0071 code, it’s not advisable. Ignoring this code can lead to decreased performance, increased emissions, and potential damage to the engine or catalytic converter. It’s best to have the issue diagnosed and repaired as soon as possible.

How can I diagnose P0071 myself using GeekOBD APP?

To diagnose P0071 with the GeekOBD APP, first connect the app to your vehicle’s OBD2 port. Run a full scan to retrieve all trouble codes and check the freeze frame data for context. You can also monitor the live data from the IAT sensor to see if it’s functioning properly.

What vehicles are most commonly affected by P0071?

P0071 is frequently found in vehicles like the 2010-2015 Honda Accord, 2008-2014 Chevrolet Malibu, and 2012-2016 Ford Focus. It’s a good idea to check for any service bulletins or recalls related to your model that may pertain to this issue.

How can I prevent P0071 from happening again?

Regular maintenance is key. Ensure your air intake system is clean and free of debris, keep an eye on sensor wiring for wear, and consider periodic inspections of the intake air temperature sensor during routine services to catch issues early.

What is P0071?

The P0071 code refers to an issue with the intake air temperature (IAT) sensor circuit, specifically indicating a range or performance problem. The IAT sensor measures the temperature of the air entering the engine, which is crucial for optimizing air-fuel mixtures. A malfunctioning sensor can lead to poor engine performance, increased emissions, and reduced fuel efficiency. When the engine control module (ECM) detects that the IAT sensor readings are out of range or inconsistent with expected values, it triggers the P0071 code. This code is commonly associated with vehicles such as the 2010-2015 Honda Accord, 2012-2016 Ford Focus, and 2008-2014 Chevrolet Malibu, among others. Symptoms can manifest as rough idling, poor acceleration, or unusual fuel consumption patterns. If left unaddressed, the engine may run poorly, leading to further complications like rough engine operation and potential catalytic converter damage due to unburned fuel. Drivers should take this code seriously, as it affects overall engine performance and may lead to more significant repairs if ignored.

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

Symptoms

Common symptoms when P0071 is present:

  • Check engine light illuminates or blinks continuously, indicating an active fault.
  • Engine may hesitate or struggle during acceleration, leading to a frustrating driving experience.
  • Fuel economy may decrease significantly, often noted as a drop of 10-20% compared to previous mileage.
  • Unusual engine noises such as knocking or pinging may occur due to incorrect air-fuel mixture.
  • Difficulty starting the engine, especially in colder temperatures where air density impacts performance.

Possible Causes

Most common causes of P0071 (ordered by frequency):

  1. The most common cause is a faulty IAT sensor, which accounts for about 60% of P0071 occurrences. Replacing the sensor is usually straightforward and cost-effective.
  2. Wiring issues such as frayed wires or poor connections can lead to inaccurate readings, contributing to approximately 25% of cases. Inspecting and repairing the wiring harness is essential.
  3. Contaminated air intake or sensor housing can cause false readings; regular maintenance can prevent this issue.
  4. Less common causes include a malfunctioning ECM, which may need reprogramming or replacing if other solutions fail.
  5. A rare cause could be a significant vacuum leak, which can affect air temperature readings and overall engine performance.

P0071 Repair Costs

Cost Breakdown by Repair Type

IAT Sensor Replacement

Replacing the faulty intake air temperature sensor, the most common fix for P0071.

  • Total: $100 - $250
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring or connectors in the IAT circuit.

  • Total: $50 - $150
  • Success rate: 75%
ECM Reprogramming

Reprogramming or replacing the engine control module if it is determined to be faulty.

  • Total: $300 - $1,200
  • Success rate: 50%
Money-Saving Tips for P0071
  • 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 P0071 Diagnosis Process

Follow these systematic steps to accurately diagnose P0071. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for damaged wiring, loose connections, or corrosion in the IAT sensor circuit (5-10 minutes)

Step 1: Initial visual inspection - Check for damaged wiring, loose connections, or corrosion in the IAT sensor circuit (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 using the GeekOBD APP - Retrieve all present codes and freeze frame data to contextualize the fault (10-15 minutes)

Step 2: OBD2 scan using the GeekOBD APP - Retrieve all present codes and freeze frame data to contextualize the 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 IAT sensor's resistance at various temperatures (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the IAT sensor's resistance at various temperatures (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 IAT sensor operates correctly and clear the codes from the ECM (10-15 minutes)

Step 4: System function test - After repairs, verify the IAT sensor operates correctly and clear the codes from the ECM (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 repair resolved the issue (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the repair resolved the issue (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: Honda Accord 2013 P0071 Repair Case

Vehicle: 2013 Honda Accord, 75,000 miles

Problem: Customer reported decreased fuel economy and check engine light illumination.

Diagnosis: Upon scanning with the GeekOBD APP, P0071 was confirmed. A visual inspection revealed corroded connections at the IAT sensor.

Solution: Replaced the IAT sensor and cleaned the connectors.

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

Result: Post-repair, fuel economy improved, and the check engine light remained off.

Case Study 2: Ford Focus 2014 P0071 Troubleshooting

Vehicle: 2014 Ford Focus, 65,000 miles

Problem: Customer experienced rough idling and hesitation during acceleration.

Diagnosis: Diagnostic scan revealed P0071, and testing showed the IAT sensor was reading inaccurately.

Solution: Replaced the faulty IAT sensor.

Cost: $150 (sensor: $100, labor: $50)

Result: After the repair, the vehicle ran smoothly, and the symptoms were resolved.

Diagnose P0071

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0071
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes