Peugeot / Citroën 4-Pin Waterproof Ignition Coil Connector – Female OEM

This 4-pin waterproof female connector serves Peugeot and Citroën ignition coil pack harnesses on PSA Group engines. The 4-pin configuration carries ignition trigger signal, coil primary power, ground, and a coil primary current feedback circuit — allowing the ECU to detect individual coil failures without a misfire event. The waterproof sealed design protects against oil contamination and moisture in the underhood environment. Available bare or with 15cm pre-wired leads.

PSA 4-Pin Ignition Connector – Circuit Function

Pin 4 is the key differentiator between PSA's 3-pin and 4-pin ignition connectors. The feedback circuit allows the ECU to monitor coil primary current on each cylinder independently — a corroded pin 4 causes the ECU to log P0351–P0354 fault codes even when the coil itself is functional.

Key Specifications

Fault Codes This Connector Fixes

3-Pin vs 4-Pin PSA Ignition Connector – Which Do I Need?

PSA Group engines use both 3-pin and 4-pin ignition connectors depending on the coil pack design and engine generation. The 4-pin variant is used on coil packs with an integrated diagnostic feedback circuit (pin 4). If your vehicle logs P0351–P0354 codes without a confirmed coil failure, the 4-pin connector with its feedback circuit is the correct replacement. Cross-reference your vehicle's wiring diagram or compare the original connector pin count before ordering.

Why PSA Ignition Connectors Fail

Peugeot and Citroën ignition coil connectors are mounted directly on the coil pack, in close proximity to the engine block. Thermal cycling from engine heat, combined with oil vapour contamination from the cam cover area, accelerates terminal oxidation. On THP and EP6 engines, the coil pack is located in a recessed area of the cam cover that traps moisture — making this connector particularly susceptible to corrosion-induced ignition faults.

Step-by-Step Installation

1. Disconnect the vehicle battery (negative terminal first)
2. Allow the engine to cool before working near the coil pack
3. Locate the 4-pin ignition connector on the coil pack harness
4. Release the locking tab and unplug the original connector
5. Inspect all 4 terminals for corrosion, moisture, or deformation
6. Transfer terminals to the new housing, or splice in the pre-wired 15cm variant
7. Reconnect the battery and clear P0351–P0354 codes with Diagbox (PSA) or a compatible OBD2 scanner
8. Perform a test drive and confirm no misfire codes return

Variant Guide

• Female (Bare) – 4-pin housing with terminals, no leads
• Female 15CM – Pre-wired with 15cm colour-coded leads for direct splice-in

Frequently Asked Questions

Q: What Peugeot and Citroën models use this 4-pin ignition connector?
A: Peugeot 207/208/307/308/3008/508 and Citroën C3/C4/C5/DS3/DS4 with THP, EP6, and EP3 petrol engines. Cross-reference your vehicle's wiring diagram to confirm fitment.

Q: My car shows P0351 but the coil tests fine — is it the connector?
A: Yes, this is the classic symptom of a corroded pin 4 (feedback circuit). The ECU logs P0351–P0354 when it loses the coil primary current feedback signal, even if the coil itself is functional. Replace the connector and clear codes before replacing the coil.

Q: Can I use Diagbox to diagnose this fault?
A: Yes. Connect Diagbox and read ignition system fault codes. P0351–P0354 codes from the ECU module, combined with clean coil resistance readings, confirm a connector fault rather than a coil failure.

Q: Are terminals included?
A: Yes, terminals are included with all variants.

Compatible Applications

• Peugeot 207/208/307/308/3008/508 – THP/EP6 ignition coil pack harness
• Citroën C3/C4/C5/DS3/DS4 – Ignition module connector
• PSA Group 4-pin waterproof ignition applications (THP, EP6, EP3 engines)