High-quality Parking Assist ECU suitable for a range of Stellantis vehicles, commonly sought under OE numbers such as 9661496880 and related codes. Designed to manage ultrasonic sensors and provide reliable parking aid functions, this control unit is aimed at professional workshops and DIY mechanics who service Citroën and Peugeot models. Clear product codes in the listing make it easy to find the correct replacement; technicians appreciate direct cross-references for fast diagnosis and repair.

Function And Fitment

The unit controls the parking sensor system (ultrasonic sensors), interpreting distance data and triggering audible/visual warnings in the cabin. It integrates with the vehicle’s CAN network and may interact with other convenience systems (e.g., reverse light signal, dashboard indicators). Typical fitment includes several Citroën and Peugeot models from around 2005 onwards — frequently used applications are Citroën C8, Peugeot 307, and Peugeot 807, but fitment can extend to other Stellantis platforms that share parking assist architecture.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Parking Assist Control Unit (ECU) — Applicable Models: Citroën C8, Peugeot 307, Peugeot 807 (and other compatible models from 2005+)
• Product Codes: 9661496880, 601.990
• Other Numbers: 6590N2, 6590V4, 659078, 6590K9, 6590L0, NFP

Installation Recommendations

Before starting work, always disconnect the vehicle battery to avoid short circuits and damage to electronic modules. Typical replacement steps:

1. Locate the parking ECU (location varies by model — commonly behind the rear bumper, in luggage compartment side panels, or under trim panels).
2. Remove trim or bumper fasteners to gain access to the unit.
3. Unplug electrical connectors and note locking tabs; inspect connector pins for corrosion or damage.
4. Unbolt and remove the old unit, then install the replacement and secure fasteners.
5. Reconnect connectors and the battery, then perform a system check. The parking system may require sensor initialization or calibration and a full diagnostic check to clear any stored faults.

When in doubt about initialization or adaptation procedures, use an appropriate diagnostic tool capable of working with PSA systems to confirm proper operation and clear fault codes.

Most Common Failure Reasons

• Moisture Ingress And Corrosion: Exposure to water and road salts can corrode connectors or internal circuits, causing intermittent or permanent failure.
• Impact Damage: Rear collisions or strong impacts to the bumper can damage sensors or the control unit mounting and wiring.
• Electrical Surges Or Faulty Wiring: Short circuits, poor grounds or damaged wiring harnesses can lead to ECU malfunction.
• Age-Related Wear: Internal components and solder joints can degrade over many years, especially in vehicles often driven in harsh conditions.

Notes For Mechanics And DIYers

This control unit is commonly searched by its OE/reference numbers — include these in your parts search to speed up sourcing. After replacement, check all ultrasonic sensors for correct operation and no physical damage. Inspect connector seals and wiring looms for corrosion or mechanical wear to prevent repeat failures. For reliable long-term repair, clean and protect connectors and ensure secure mounting away from moisture paths.