p1128
Moderate
Porsche · Sedans & Sports Cars
Throttle Valve Adaptation Out of Range
Quick Answer
Error code P1128 on your Porsche Sedans & Sports Cars means: Throttle Valve Adaptation Out of Range. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Clean the throttle body and inlet valve deposits with carburetor cleaner
2
Test throttle position sensor voltage at idle and under load
3
Verify throttle control motor response to ECU commands
4
Check for any intake manifold or air leak issues
5
Perform throttle body relearn procedure per manufacturer specifications
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Throttle body cleaning supplies
Throttle position sensor
Throttle control motor
Intake gaskets
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