The gear shift lever and cables play a crucial role in transmitting the driver’s gear selection inputs to the transmission, enabling precise and responsive gear changes. Over time, these parts may wear out or become less effective, leading to difficulties in shifting or noticeable play in the gear lever. Common causes of failure include cable stretching, fraying, or lever wear, often triggered by regular use and environmental factors such as dirt or moisture.

Replacing the gear shift lever and cables can restore optimal shifting performance and improve driving comfort. Installation typically involves removing the center console trim, disconnecting the old cables from the transmission and shift lever, and fitting the new assembly securely. This repair is suitable for experienced mechanics as well as dedicated DIY car enthusiasts familiar with Citroën or Peugeot models.

Technical Information

• Manufacturer: PSA Group
• Models: Citroën C4 II (B7), DS4
• Product Codes: 2400NG
• Additional Numbers: Applicable to various PSA transmission configurations for C4 II and DS4

Description

High-quality replacement gear shift knob with integrated gaiter designed for Citroën C4 II (B7) and DS4 models. The part combines ergonomic design and durable materials to restore the original feel of the gear lever and improve interior appearance. The Black Mistral (HZD) finish blends with factory trim and provides a comfortable grip for everyday driving and frequent gear changes. Commonly searched by OEM codes such as 2403FK, 2403X9, 7591SF and 7591SC, this item is suitable for technicians and DIY enthusiasts who need a direct-fit solution for manual transmission vehicles.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C4 II (B7), DS4
• Product Codes: 2403FK, 2403X9, 7591SF, 7591SC
• Additional Numbers: 7591SC (alternate), 2403X9 (OE reference)
• Color: Black Mistral (HZD)
• Condition: Used replacement part

Fitment And Function

This shift knob assembly is intended for manual transmission versions of the Citroën C4 II (B7) and DS4 where the listed OEM references apply. The knob provides the driver with a tactile, ergonomic contact point for gear selection, while the gaiter protects the shift mechanism from dust, dirt and moisture and hides linkage components. It restores interior aesthetics and prevents premature wear to surrounding trim.

Installation Recommendations

• Prepare basic hand tools and plastic trim removal tools to avoid damaging the center console.
• Place the vehicle in neutral and engage the parking brake for safety during installation.
• Remove any decorative trim around the gear lever (carefully pry with plastic tools) to access the retaining clip or screws.
• Unclip or unscrew the old knob—some variants pull off with a retaining spring clip; others are threaded or secured with a set screw underneath the gaiter.
• Slide the new gaiter over the lever and secure its bottom edge into the retaining groove or trim ring. Fit the new knob and reattach clips or screws, ensuring correct orientation of the gear pattern.
• Check for firm seating and full range of gear movement. Reinstall trim panels and test drive to confirm proper engagement.
• Use care with leather or vinyl surfaces—avoid aggressive solvents or lubricants that can stain or degrade the material.

Most Common Cause Of Failure

• Wear And Surface Degradation: Continuous handling, abrasion, and UV exposure cause fading, cracking or smoothing of the grip surface.
• Broken Retaining Clip Or Internal Insert: Repeated removal or impact can break the plastic clip or the threaded/pressed insert, causing looseness or detachment.
• Gaiter Damage: The gaiter typically fails by tearing at the seam or becoming brittle with age and heat, allowing dirt into the shift mechanism.
• Contamination: Oil, grease and dirt can accelerate material breakdown and cause stitching or adhesive joints to fail.

Notes For Mechanics

When replacing the shift knob and gaiter, inspect the lever mounting and linkage for play or wear. Replacing the knob without addressing worn linkages can leave shifting performance unimproved. Keep the OEM codes (2403FK, 2403X9, 7591SF, 7591SC) handy when searching parts catalogues or ordering to ensure correct match.