Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer thinks the air going into the engine is too cold on one side of the engine. It's like thinking it's winter when it's actually summer.
The intake air temperature sensor measures the temperature of the air entering the engine. If the sensor reports a temperature that is too low, it triggers this code.
The P118F code indicates that the intake air temperature sensor 1 on Bank 2 is reading a temperature that is lower than the expected minimum threshold. This could be due to a sensor malfunction, wiring issues, or actual low air temperatures.
• Check Engine Light is on
• Poor engine performance
• Increased fuel consumption
• Faulty intake air temperature sensor
• Wiring issues or poor connections
• Actual low intake air temperature
Intake Air Temperature Sensor: A device that measures the temperature of air entering the engine.
Bank 2: The side of the engine opposite to Bank 1, typically on V-type engines.
• Use an OBD-II scanner to confirm the code.
• Inspect the intake air temperature sensor and its wiring.
• Check for any air leaks or blockages in the intake system.
• Replace the intake air temperature sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Ensure there are no blockages in the air intake system.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• BMW 3 Series
• Audi A4
• Mercedes-Benz C-Class
• Regularly inspect and maintain the air intake system.
• Ensure sensors are clean and free of debris.
• Check wiring connections periodically.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Regular maintenance can prevent sensor issues.
Sensor issues may be covered under the vehicle's emissions warranty.
This code has been more common in colder climates where actual low intake temperatures are possible.
Moderate – While the vehicle may still run, it can lead to poor performance and increased emissions.
Driving with a faulty sensor may lead to increased emissions, which can be illegal in some areas.
• Engine at operating temperature
• Ambient temperature above freezing
The intake air temperature sensor is typically located in the air intake duct or manifold on Bank 2 of the engine.
Q: Can I drive with a P118F code?
A: While you can drive with this code, it's best to address it soon to avoid potential engine performance issues.
Q: How does the intake air temperature sensor affect my car?
A: The sensor helps the engine adjust fuel and air mixture for optimal performance and efficiency.
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