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P0099 Severity
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
Diesel engines uses an Intake Air Temperature Sensor to measure the temperature of the air going into the charge air cooler. If the engine computer (PCM) determines that the reading from the sensor is not plausible, code P0099 will set.
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OBD-II Code Decreased engine performance is defined as a Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic
Diesel engines uses an Intake Air Temperature Sensor to measure the temperature of the air going into the charge air cooler. If the engine computer (PCM) determines that the reading from the sensor is not plausible, code P0099 will set.