P0099
Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic
Generic code
Fuel and Air Metering
High severity
Moderate repair
Free on OBD DashX
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What P0099 means
- The fault code P0099 indicates an intermittent or erratic issue with the intake air temperature sensor 2 circuit. This sensor is responsible for measuring the temperature of the air entering the engine. Intermittent or erratic readings from the sensor can affect the engine's performance and fuel efficiency.
Possible symptoms
- Intermittent Check Engine Light (MIL) illumination
- Inconsistent or fluctuating intake air temperature readings
- Engine performance issues, such as rough idling, hesitation, or power loss
- Unstable fuel efficiency
- Possible drivability problems, including stalling or surging
Possible causes
- Loose or corroded electrical connections related to the intake air temperature sensor 2
- Damaged or worn
- out sensor wiring
- Faulty or malfunctioning intake air temperature sensor 2
- Intermittent issues with the engine control module (ECM)
- Environmental factors affecting the sensor's performance (e.g., excessive heat or moisture)
- Possible
Related parts
- Intake Air Temperature Sensor: Intake Air Temperature Sensor measures the temperature of air at which it is taken into the engine. This car's malfunctioning sensor will lead to engine stalling, lack of power and engine noises
Possible solutions
- Inspect and clean the electrical connections associated with the intake air temperature sensor 2, ensuring they are secure and free from corrosion
- Check the sensor wiring for any damage, wear, or breaks, and repair or replace as necessary
- Test the intake air temperature sensor 2 using appropriate diagnostic tools, and replace if it is found to be faulty
- Monitor and log the sensor's performance during operation to identify intermittent issues with the ECM or environmental factors
- If other related sensors or components share the same power or ground circuits, inspect and test them for potential issues as well
Free on OBD DashX
P0099 on OBD DashX
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