P0099 Fault Code

P0099 OBD-II Trouble Code Short Description

Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1

What does trouble code P0099 mean?

P0099 is a fault code that indicates an issue with the Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1 in a vehicle. This sensor is responsible for monitoring the temperature of the air entering the engine. When the sensor detects an intermittent or erratic signal, it can cause performance issues such as rough idling, hesitation, or poor fuel efficiency.

The solution for the P0099 fault code usually involves inspecting the sensor and its connections for any damage or corrosion. If any issues are found, the sensor may need to be replaced. It is important to address this issue promptly to ensure optimal engine performance and fuel efficiency.

It is also worth noting that an intermittent or erratic signal from the Intake Air Temperature Sensor can impact the engine's ability to adjust the air-fuel mixture properly, potentially leading to further engine damage if left unresolved. Therefore, it is recommended to have this issue diagnosed and fixed by a qualified mechanic as soon as possible.


What are the symptoms of the P0099 code?

  • Check Engine Light illuminated
  • Poor engine performance
  • Decreased fuel efficiency


What causes the P0099 code?

When the P0099 fault code appears on cars, it is typically caused by the following issues:

  • A faulty intake air temperature sensor 2
  • Loose or corroded electrical connections related to the sensor
  • Wiring issues such as frayed or damaged wires
  • Issues with the Engine Control Module (ECM)
  • Intermittent or erratic signal from the sensor due to a manufacturing defect or environmental factors

Possible Solutions

How to fix P0099?

To fix the P0099 fault code related to the Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1, you can follow these steps:

  1. Inspect the wiring: Check for any damaged or corroded wires leading to the intake air temperature sensor.
  2. Check the sensor connection: Ensure that the sensor is properly connected and that there are no loose connections.
  3. Replace the sensor: If all else fails, consider replacing the intake air temperature sensor to fix the issue.
  4. Clear the fault code: Once the repair is completed, clear the fault code using an OBD-II scanner to reset the system and see if the issue persists.

By following these steps, you should be able to address the P0099 fault code on your car.