P2199 Fault Code

Intake Air Temperature Sensor 1/2 Correlation

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2199 fault code indicates a correlation issue between the readings of the intake air temperature (IAT) sensor 1 and sensor 2. These sensors are critical in providing accurate temperature readings to the engine control unit (ECU) to optimize air-fuel mixture and engine performance. If the sensors report significantly different temperatures, it may suggest a fault in one or both sensors or issues in the wiring or connectors associated with them.

• The intake air temperature sensors are usually located in the air intake system, measuring the temperature of incoming air.
• The ECU relies on these measurements to adjust fuel delivery and ignition timing intelligently, ensuring efficient engine performance.
• Significant discrepancies between the two sensor outputs can lead to engine performance issues and increased emissions.

What are the symptoms of the P2199 code?

Common symptoms associated with the P2199 fault code may include:

• Check Engine Light illuminated on the dashboard.
• Decreased engine performance, including reduced power and acceleration.
• Poor fuel economy due to unoptimized air-fuel mixture.
• Potential misfiring or stalling of the engine under load.
• Increased exhaust emissions due to improper fuel combustion.

What causes the P2199 code?

The primary causes of the P2199 fault code may include:

• Faulty intake air temperature sensors that provide incorrect readings.
• Wiring issues, such as short circuits or open circuits, affecting sensor performance.
• Poor connections at the IAT sensor plugs, leading to bad electrical contacts.
• Problems in the engine control unit (ECU) that processes the sensor data.
• An obstructed air intake that could cause incorrect temperature readings.

How to fix P2199?

To resolve the P2199 fault code, follow these steps:

• Inspect the IAT sensors for visible damage or wear, and replace them if faulty.
• Check the wiring and connectors associated with both IAT sensors for any signs of corrosion, breaks, or shorts.
• Ensure all connections are secure and clean, making necessary repairs or replacements as required.
• If the sensors and wiring are intact but the issue persists, consider scanning the ECU for additional trouble codes that might indicate more complex problems.
• Once repairs are made, clear the fault codes using an OBD-II scanner and test drive the vehicle to confirm the issue is resolved.