OBD-II Code P0071 is defined as Ambient Air Temperature Sensor Range/Performance. This code indicates that the engine control module (PCM) has detected an issue with the performance of the ambient air temperature sensor, which plays a crucial role in determining the correct fuel mixture for the engine during startup.
What Does the P0071 Code Mean?
The P0071 code signifies that there is a problem with the ambient air temperature sensor’s range or performance. The PCM relies on this sensor to gauge how much fuel to inject at startup and to reference other temperature sensors on the engine.
What Causes the P0071 Code?
Several factors can trigger the P0071 code, including:
- Ambient air temperature sensor failure
- Powertrain Control Module (PCM) failure
- Wiring issues related to the sensor
What Are the Symptoms of the P0071 Code?
Common symptoms associated with the P0071 code include:
- Hard engine start
How Serious Is the P0071 Code?
The severity of the P0071 code is moderate. While it may not immediately threaten the vehicle’s safety or functionality, it should be diagnosed and repaired in a reasonable timeframe to avoid potential long-term damage or decreased performance.
How to Diagnose the P0071 Code
To diagnose the P0071 code, a mechanic typically follows these steps:
- Use an OBD-II scanner to confirm the presence of the P0071 code.
- Inspect the ambient air temperature sensor and its wiring for any visible damage or disconnections.
- Test the sensor’s resistance and voltage output, comparing it to manufacturer specifications.
- Check for any additional trouble codes that may provide further insight into the issue.
Common Repairs for the P0071 Code
Repairs for the P0071 code may include:
- Replacing the ambient air temperature sensor
- Repairing or replacing damaged wiring or connectors
- Replacing the Powertrain Control Module (PCM) if necessary
How Much Does It Cost to Fix the P0071 Code?
The cost to fix the P0071 code can vary significantly based on the underlying issue. On average, you might expect to pay between $100 and $300 for repairs, including parts and labor. If the PCM needs replacement, costs could rise considerably.
Can I Fix the P0071 Code Myself?
If you have some mechanical experience and the right tools, you may be able to address the P0071 code yourself. Simple repairs, such as replacing a faulty sensor or fixing wiring issues, can often be done with basic automotive knowledge. However, if the issue involves the PCM or if you’re unsure, it’s best to consult with a professional mechanic to ensure proper diagnosis and repair.
