Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Porsche Boxster (987) F6-2.9LFACTORY OEM SERVICE PROCEDURE
Absolute Pressure Sensor: Testing and Inspection
DIAGNOSIS OF AMBIENT PRESSURE SENSOR
General Description
The diagnostic function observes the signal from the ambient pressure sensor for naturally aspirated engines without using a manifold pressure sensor.
The voltage of the ambient pressure sensor is measured and the ambient pressure is calculated by using a offset and a gradient.
Range Check of Ambient Pressure
If the difference of the pressure of the last driving cycle and the pressure at the begin of the actual driving cycle exceeds a threshold, a plausibility fault is assumed.
If the pressure remains under a threshold for a given period an ambient pressure sensor at minimum fault is assumed.
If the pressure exceeds a specified threshold for a given period an ambient pressure sensor at maximum fault is assumed.
If the change of the pressure related to time during the driving cycle exceeds a threshold, a signal fault is assumed.
Diagnosis of Ambient Pressure Sensor
General Description
The diagnostic function observes the signal from the ambient pressure sensor for naturally aspirated engines without using a manifold pressure sensor.
The voltage of the ambient pressure sensor is measured and the ambient pressure is calculated by using a offset and a gradient.
Range Check of Ambient Pressure
If the difference of the pressure of the last driving cycle and the pressure at the begin of the actual driving cycle exceeds a threshold, a plausibility fault is assumed.
If the pressure remains under a threshold for a given period an ambient pressure sensor at minimum fault is assumed.
If the pressure exceeds a specified threshold for a given period an ambient pressure sensor at maximum fault is assumed.
If the change of the pressure related to time during the driving cycle exceeds a threshold, a signal fault is assumed.
Diagnosis of Ambient Pressure Sensor
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.