Throttle Body Issues in Porsche Boxster and 911 Models (2000-2004)
Porsche owners of Boxster and 911 models from 2000 to 2004 may experience drivability issues, including lack of response from the throttle pedal and throttle body, rough running and inconsistent idle. The problem is reflected in the form of faults with the Throttle Body Adaptation, Throttle Body, and Throttle Pedal, as displayed by the ECU OBDII codes.
The initial solution by mechanics may be to pin out the wiring harness or replace the parts identified as faulty on the scanner, however, this is not always successful as the problem persists. The root cause of the problem is usually a short circuit to ground in the engine compartment that damages the internal circuits of the ECU. Any component or connector that contains a 12V or 5V power source and a ground wire may touch each other, generating a short circuit that causes the throttle body issues.
In 20% of cases, the problem may be related to the throttle body itself going bad or a sensor malfunction internally that backfeeds the ECU. Another cause can be the age of the engine wiring harness that, in some cases, deteriorates and results in live wires touching each other.
It is crucial to understand the order of events and how to diagnose the car correctly. Simply buying or fixing the ECU and installing it without addressing the root problem will result in the issue reoccurring as soon as the key is turned. The ground circuit will remain damaged until the ECU is repaired or replaced, or the car is fixed correctly.
Note: This issue specifically affects Porsche Boxster and 996 models with ECU# 0261204790 from 2000 to 2004.
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