4-Pin Automotive Connector – VW 1J0 919 231, Coolant Temperature Sensor Plug for VW Golf, Jetta & Audi A4

VW part number 1J0 919 231 is a 4-pin connector plug used for coolant temperature sensor (CTS) and similar sensor connections in Volkswagen Group vehicles. This connector is used throughout the VW Golf Mk4, Jetta, Passat, Bora, and Audi A4/A6 model ranges with 1.8T, 2.0, and TDI engines. The 4-pin configuration carries: coolant temperature signal, ground, and additional circuits for dual-temperature sensors or combined temperature/level sensors. A common repair item — the connector housing cracks from heat cycling in the engine bay, causing intermittent coolant temperature faults.

Key Specifications

• VW Part Number: 1J0 919 231
• Pin Count: 4 pins
• Housing Material: PA66 nylon, heat-resistant
• Application: Coolant temperature sensor and similar sensor connections in VW Group vehicles
• Compatible Vehicles: VW Golf Mk4, Jetta, Passat, Bora; Audi A4, A6; Skoda Octavia; SEAT Leon (1.8T, 2.0, TDI engines)

Common Fault Symptoms — When to Replace 1J0 919 231

• Coolant temperature gauge erratic: Intermittent or incorrect coolant temperature reading caused by a cracked connector housing or corroded terminal
• Engine management warning light: P0115, P0116, P0117, P0118 (coolant temperature sensor circuit) fault codes caused by connector failure
• Fan running continuously: The ECU defaults to maximum cooling fan speed when the coolant temperature signal is lost — caused by a failed CTS connector
• Poor cold start: The ECU uses coolant temperature for cold start enrichment — a failed CTS connector causes incorrect fueling during cold start

Frequently Asked Questions

How do I repair the 1J0 919 231 connector?

If the housing is cracked or the latch is broken: replace the housing. Cut the wires behind the damaged connector, strip 8–10mm, crimp new 2.8mm VW terminals (1928498806) onto each wire, and insert into the new housing until each terminal clicks. If only the terminals are corroded: extract the corroded terminals using a terminal extraction tool, clean the wire ends, crimp new terminals, and reinsert. Apply dielectric grease to the terminal contact area before reassembly to prevent future corrosion.

What terminals are used in 1J0 919 231?

The 1J0 919 231 connector uses 2.8mm VW/Bosch female crimp terminals — part number 1928498806 (DJ626A-2.8). These are the standard 2.8mm terminals used throughout VW Group vehicles for sensor and signal circuits. Crimp tool: Bosch 1 987 010 502 or equivalent ratchet crimp tool with 2.8mm dies.

Is 1J0 919 231 the same as 1J0919231?

Yes. VW part numbers are written with spaces (1J0 919 231) or without spaces (1J0919231) — both refer to the same part. When searching for this part number, try both formats in the VW/Audi parts catalog.

Typical Applications

• VW Golf Mk4 / Jetta / Bora: Coolant temperature sensor connector replacement
• VW Passat B5: Coolant temperature sensor connector repair
• Audi A4 B5/B6 / A6 C5: Coolant temperature sensor connector replacement
• Skoda Octavia Mk1 / SEAT Leon Mk1: Coolant temperature sensor connector repair

Package Contents

1 piece — VW 1J0 919 231 4-pin connector plug housing. Terminals (1928498806) ordered separately if not included.