Description
Control module, unit, ABS ESP block with a short section of wiring harness. Hydraulic brake control block. From a 2008 Peugeot 407 1.6 HDi (engine code 9HZ).
Product Overview
This ABS/ESP control module with integrated hydraulic block is the electronic brain and actuator for the vehicle’s anti-lock braking and stability systems. The unit houses solenoid valves, the hydraulic pump and the control electronics that modulate brake pressure during ABS and ESP interventions. It is supplied with a short piece of wiring harness to connect to the vehicle loom and sensors.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Peugeot 407 (2008) 1.6 HDi, Engine Code 9HZ. May also be found on other Stellantis models using the same part codes.
- Product Codes: 9665736080, 0265950659, 265950659, 41682607380
- Additional Numbers: 4541HE, 4541HF, 541HE
Compatibility And Search Tips
This module is often searched by its product numbers (for example 9665736080 or 0265950659). Primary fitment is Peugeot 407 (2008) 1.6 HDi. Other Citroën/Peugeot models that share ABS/ESP systems with these codes may be compatible — check the listed part numbers when searching.
Recommended Installation
Replacement should be performed by a professional mechanic or a competent DIYer with suitable tools and diagnostic equipment. Typical replacement steps:
- Park on level ground, secure vehicle and disconnect the negative battery terminal.
- Depressurize the brake system if required and remove trim or components to access the ABS unit.
- Disconnect electrical connectors and brake lines from the ABS hydraulic block (prepare to capture brake fluid).
- Unbolt and remove the old unit; fit the replacement, connect wiring harness and brake pipes, and torque bolts to manufacturer specification.
- Refill the brake reservoir with the recommended fluid (usually DOT4) and perform a full brake bleeding procedure to remove air from the system.
- Use a diagnostic tool (e.g., Peugeot/Citroën compatible scanner) to clear fault codes, run ABS pump priming procedures and, if required, code or initialize the new control unit.
Always follow safety procedures when working with the brake system. If you are unsure about coding or initialization, use a professional diagnostic tool to complete the final steps.
Why The Part Most Often Fails
ABS/ESP modules typically fail due to a combination of electrical and hydraulic causes. Common reasons include corrosion and moisture ingress in connectors, failure of the internal pump motor, valve block wear or leakage, and electronic component failure caused by voltage spikes or prolonged exposure to heat. Age and mileage are strong factors—vehicles over 10 years or 100–150k km are more likely to experience faults. Symptoms include ABS or ESP warning lights, loss of ABS functionality, noisy pump operation, and brake fluid leaks around the hydraulic block.
Practical Notes For Mechanics and DIYers
When sourcing a replacement, cross-check the part numbers listed above. After installation, verify that wheel-speed sensors and wiring are intact and free of corrosion, because sensor faults often trigger module errors that can be mistaken for a failed ABS unit. Proper bleeding and diagnostic initialization are essential to restore full braking and stability functionality.
