Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is saying that the pressure in the fuel system is too low before the engine starts, like when you try to start the car, but it doesn't have enough fuel pressure to start properly.
This code indicates that the fuel rail pressure sensor has detected a lower than expected pressure in the fuel rail before the engine starts.
The fuel rail pressure sensor monitors the pressure of the fuel in the rail that supplies the injectors. If the pressure is too low before the engine starts, it can cause starting issues and poor engine performance. This code is specific to Bank 2, which refers to the side of the engine that contains cylinder 2 in a V-type engine.
• Engine hard to start
• Poor engine performance
• Check Engine Light is on
• Faulty fuel rail pressure sensor
• Fuel pump malfunction
• Fuel pressure regulator failure
Fuel Rail: A pipe that delivers fuel to the injectors.
Bank 2: The side of a V-type engine that contains cylinder 2.
• Check for any other codes and address them first.
• Inspect the fuel rail pressure sensor and its wiring for damage.
• Test the fuel pressure using a fuel pressure gauge.
• Replace the fuel rail pressure sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Replace the fuel pump if it is not providing adequate pressure.
• OBD-II scanner
• Fuel pressure gauge
• Multimeter
$150 - $500
Moderate
• BMW 3 Series
• Audi A4
• Mercedes-Benz C-Class
• Regularly maintain the fuel system.
• Use high-quality fuel.
• Replace fuel filters as recommended.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Avoid driving with low fuel levels frequently.
Check with the vehicle manufacturer for specific warranty coverage on fuel system components.
This code is relatively common in vehicles with direct fuel injection systems, where precise fuel pressure is crucial.
Moderate – It should be addressed soon to avoid potential starting issues or engine performance problems.
Driving with a fuel system issue can lead to poor performance and potentially unsafe driving conditions.
• Vehicle off and cold
• Ensure adequate fuel in the tank
The fuel rail pressure sensor is typically located on the fuel rail, which is mounted on the engine.
Q: Can I drive with a P118D code?
A: It's not recommended to drive for extended periods with this code, as it can lead to starting issues and poor performance.
Q: How do I reset the Check Engine Light after repairs?
A: Use an OBD-II scanner to clear the codes after the necessary repairs have been made.
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