ABS / PSM control unit cover. Porsche 993 / 996 911 1994–05  ›  99661803800

Genuine Porsche ABS / PSM control unit cover.

Fits

• Porsche 993 (911) 1994–98
• Porsche 993 (911) C2 1994–97
• Porsche 993 (911) C4 1994–97
• Porsche 993 (911) RS 1994–97
• Porsche 993 (911) C2S 1994–97
• Porsche 993 (911) C4S 1994–97
• Porsche 993 (911) Turbo 1994–96
• Porsche 993 (911) GT2 1994–97
• Porsche 993 (911) Turbo S 1994–97
• Porsche 996 (911) 1997–2005
• Porsche 996 C2 3.4L 1997–08/01
• Porsche 996 C4 3.4L 1997–08/01
• Porsche 996 C2 3.6L 09/01–2005
• Porsche 996 C4 3.6L 09/01–2005
• Porsche 996 C4S 3.6L 09/01–2005

Check fitment for your specific vehicle (model, year, engine) before ordering. Confirm factory equipment and applicable option codes as well.

What This Product Does

This cover belongs to the control-unit portion of the hydraulic anti-lock braking assembly. Its role is to cover that section in the arrangement identified by the relevant exploded diagram; it does not sense wheel speed, operate the pump or regulate hydraulic pressure.

Functions

• Provides the specified covering for the ABS/PSM control-unit section.
• Reinstates the cover position within the illustrated assembly.
• Allows renewal of a missing or damaged cover without identifying it as a complete control unit.

Technical Details

• Manufacturer: Porsche; part number: 99661803800.
• Diagram designation: cover control unit; also described as cover.
• Recorded quantity: 1 per illustrated assembly.
  
  

Symptoms of Fault

• Visible cracking, deformation or other damage to the cover.
• An uncovered control-unit section where the original component is missing.
• Poor seating or insecure retention when the cover is inspected.

Why Replacement Matters

Replacing a defective cover returns this part of the assembly to its specified layout. Inspect its seating and surrounding attachment points before fitting. Dashboard ABS/PSM alerts require separate fault investigation: a replacement cover is not a remedy for sensor, wiring, hydraulic or controller defects.

FAQs

Is the controller supplied with this cover?
No. The diagram treats 99661803800 as an individual cover, separate from the hydraulic assembly and its associated components.

Can this resolve an ABS warning?
The cover alone does not correct system faults. Diagnosis should assess stored faults, electrical supply, wiring, sensors and hydraulic operation as appropriate.