P2199: Correlation 1/2 Intake Air Temperature Sensor

Introduction

The DTC P2199 error code is a warning signal for technicians and auto repairers regarding a possible anomaly in the engine management system. Specifically, this code indicates an incorrect correlation between the signals provided by the intake air temperature sensors installed in Bank 1 and Bank 2 of the engine. Proper diagnosis and resolution of this problem are essential to ensure proper engine operation and to avoid long-term damage.

Symptoms

When a P2199 trouble code occurs, your vehicle may exhibit some noticeable symptoms. Here is a list of the most common ones:

  • Engine Malfunction Indicator Light (MIL) Illuminated

  • Reduced engine performance, with possible loss of power

  • Increased fuel consumption

  • Engine slowing down or stalling during acceleration

  • Abnormal exhaust emissions

Cause

The causes of a DTC P2199 code can be many and vary depending on the type of vehicle and the engine management system. The most common causes are listed below:

  • Intake air temperature sensors malfunction

  • Faulty or incorrectly connected wiring diagrams

  • Contamination or blockage problems in the sensors themselves

  • Malfunctions of the engine control unit (ECU) or its settings

  • Suction problems, such as air leaks in the ducts

Diagnosis

Accurately diagnosing a DTC P2199 code requires a systematic approach and the use of appropriate diagnostic tools. Here are a series of steps to perform an effective diagnosis:

  1. DTC Memory Check :
    Use an OBD-II scanner to confirm the presence of the P2199 code and check for other related codes, such as P0113 (Intake Air Temperature Sensor - Circuit High) or P0112 (Circuit Low).

  2. Visual inspection :
    Check the intake air temperature sensor wiring and connectors for any signs of wear, corrosion or damage.

  3. Sensor check :
    Use a multimeter to measure the resistance and voltage of the intake air temperature sensors, comparing the values to the manufacturer's specifications.

  4. Functional test :
    Perform a functional test to observe real-time sensor data using an OBD-II scanner. Verify that the readings are consistent between the two sensors.

  5. Control unit check :
    If all components appear to be working properly, it is advisable to perform an engine control unit (ECU) test to check for any anomalies in the operating parameters.

Resolution and Repair

Once you have identified the cause of the DTC P2199 code, you can proceed to its resolution. The steps for repair are listed below:

  • Replacing sensors :
    If one or both of the intake air temperature sensors are defective, they must be replaced with new parts.

  • Restoring the wiring :
    Repair or replace damaged or corrupted wiring. Make sure all connections are secure and free from oxidation.

  • Cleaning the sensors :
    If the sensors are dirty or contaminated, proceed to clean them. In some cases, it is possible to use specific solvents for the removal of deposits.

  • ECU update :
    In case of ECU malfunctions, a software update or, in more serious cases, ECU replacement may be necessary.

  • Final test :
    After completing repairs, test drive to verify that the DTC code does not recur and that the engine runs properly.

Insight into the Components Involved

Intake Air Temperature Sensors

Intake air temperature (IAT) sensors are critical to the proper operation of your engine. These sensors measure the temperature of the air entering the engine, directly affecting the air-fuel mixture. A malfunction of these sensors can lead to inefficient combustion, increasing emissions and reducing engine performance.

Conclusions

DTC P2199, if not addressed promptly, can lead to a variety of engine performance issues and increased fuel economy. Diagnosing and fixing this code requires a thorough analysis of the intake air temperature sensors and electrical connections. By following the steps outlined in this article, auto mechanics can effectively address the problem and restore the vehicle to proper operation, thus ensuring customer satisfaction and safety on the road.

Important
Not all OBD2 codes used by one manufacturer are used by other brands, and may not have the same meaning.
The information presented here is for informational purposes only. We are not responsible for any actions you take on your vehicle. If you have any concerns about repairing your vehicle, please contact your repair shop.