This brake pressure sensor (OE references 9673199580 / 457408) is an essential component for accurate pressure monitoring in the hydraulic braking system on a range of Stellantis passenger cars. It provides the vehicle control units with real-time pressure data used by ABS, ESP and brake-assist systems to ensure safe braking performance. Designed for fitment on various Citroën, Peugeot and DS models, the sensor helps restore correct fault-free operation when replaced on vehicles presenting warning lights or degraded braking assistance.

Fitment / Compatible Models

• Citroën C4 II
• Citroën C4 Picasso
• DS4
• Peugeot 308
• Peugeot 3008 I
• Peugeot 5008 I

Benefits and Why Choose This Part

• Direct replacement for vehicles using OE numbers 9673199580 and 457408 — improves diagnostics and restores correct pressure readings.
• Keeps ABS/ESP systems working accurately by delivering reliable pressure input to control modules.
• Suitable for professional garages and competent DIY mechanics who perform brake system repairs and diagnostics.

Typical Symptoms of a Faulty Sensor

• ABS or ESP warning lamp illuminated on the dashboard.
• Intermittent or permanent loss of brake assist / longer pedal travel.
• Error codes related to brake pressure measured by diagnostic tools.
• Unusual brake system behavior under braking (pulsation, reduced modulation).

Replacement and Installation Overview

Replacement is straightforward for a trained technician but may involve exposure to brake fluid. Typical steps:

• Park on a level surface, secure the vehicle and relieve system pressure according to workshop procedures.
• Protect surrounding components from brake fluid. Disconnect the sensor electrical connector.
• Remove the sensor from its mounting (location depends on model: master cylinder/hydraulic unit or ABS modulator) and replace with the new unit.
• Reconnect electrical connector and ensure proper sealing. If hydraulic lines were opened or fluid lost, perform a complete brake bleed following manufacturer procedure.
• Clear fault codes and verify operation with a diagnostic scan; test drive to confirm normal braking and absence of warnings.

Installation Recommendations

• Use Proper Tools: Use correct sockets and take care not to damage the sensor body or connector pins.
• Avoid Contamination: Keep the sensor and surrounding area clean from dirt and brake fluid to prevent premature failure.
• Observe Seals: Replace any sealing washers or gaskets if applicable and ensure a leak-free installation.
• Diagnostics Post-Fitment: After fitting, clear stored fault codes and confirm sensor readings with a diagnostic tool to ensure correct values are reported.
• Safety: Wear eye protection and gloves when working with brake fluid. If hydraulic circuits are disturbed, perform bleeding according to the vehicle manufacturer’s instructions.

Most Common Failure Causes

• Corrosion And Water Ingress: Exposure to moisture and road salts can corrode connector contacts or internal electronics.
• Mechanical Damage: Impact or improper handling during repairs can damage the sensor housing or connector.
• Electrical Faults: Wiring harness issues, connector corrosion or intermittent contacts cause incorrect readings or open circuits.
• Aging And Drift: Over time the sensor can lose accuracy and trigger control unit warnings.

Technical Information

• Manufacturer: Stellantis
• Model: Citroën C4 II; Citroën C4 Picasso; DS4; Peugeot 308; Peugeot 3008 I; Peugeot 5008 I
• Product Codes: 9673199580
• Other Numbers: 457408

This description focuses on correct fitment and practical guidance for mechanics and experienced DIYers. When replacing brake system components always follow safety precautions and the vehicle manufacturer’s repair procedures to ensure reliable and safe operation.