Introduction To 059919501A Coolant Temperature Sensor
The 059919501A is an standard 4-pin engine coolant temperature (ECT) sensor and dashboard gauge sender unit engineered.Serving as a direct aftermarket replacement for reference part numbers 059919501A, 059919501, and 078919501C, this sensor features an updated green thermal-resistant housing with a 20mm clip-in mounting stem and a distinct rounded D-shaped 4-pin electrical socket.
It is widely installed across popular European platforms, including for VW Golf Mk4 / GTI (1999–2006 1.8T, 2.0L, 2.8L VR6, 1.9L TDI), for VW Jetta / Bora Mk4 (1999–2005), for VW Passat B5 / B5.5 (1998–2005 1.8T, 2.8L V6), for VW New Beetle (1998–2010), for VW Touareg, for Audi A3 (1999–2003), for Audi A4 / A4 Quattro B5 / B6 (1999–2006 1.8T, 2.8L, 3.0L), for Audi A6 / A6 Quattro C5 (1998–2004 2.7T, 2.8L, 3.0L), for Audi S4 / S6, for Audi TT / TT Quattro (2000–2006 1.8T, 3.2L VR6), for Seat Leon / Toledo / Ibiza, and for Skoda Octavia / Superb.
Houses dual independent Negative Temperature Coefficient (NTC) thermistors inside a high-conductivity, corrosion-resistant brass probe. Circuit 1 supplies real-time analog resistance data to the Engine Control Unit (ECU) for fuel injection pulse management, cold-start enrichment, ignition timing, and secondary radiator fan triggering. Circuit 2 independently drives the dashboard instrument temperature gauge. Each unit comes pre-packaged with a high-temperature sealing O-ring and retaining clip for a leak-free, direct plug-and-play installation.
Vehicle Compatibility & OE Reference List
Below is the full vehicle application scope and interchangeable OE part numbers for your quick reference.
| Vehicle Make | Vehicle Model | Model Years | Displacement |
|---|---|---|---|
| VW | Golf / Golf GTI | 1999–2006 | 1.8T / 2.0L / 2.8L VR6 / 1.9L TDI |
| VW | Jetta / Bora | 1999–2005 | 1.8T / 2.0L / 2.8L VR6 / 1.9L TDI |
| VW | Passat | 1998–2005 | 1.8T / 2.8L V6 / 2.0L TDI |
| VW | New Beetle | 1998–2010 | 1.8T / 2.0L / 1.9L TDI |
| VW | Touareg | 2004–2007 | 3.2L VR6 / 4.2L V8 |
| Audi | A3 / S3 | 1999–2003 | 1.8T / 1.9L TDI |
| Audi | A4 / A4 Quattro | 1999–2006 | 1.8T / 2.8L V6 / 3.0L V6 |
| Audi | A6 / A6 Quattro | 1998–2004 | 2.7T / 2.8L V6 / 3.0L V6 |
| Audi | Allroad Quattro | 2001–2005 | 2.7T / 4.2L V8 |
| Audi | TT / TT Quattro | 2000–2006 | 1.8T (180/225 HP) / 3.2L VR6 |
| Seat | Leon / Toledo | AUQ, ARY, BAM, ASZ, ARL | Gas / Diesel |
| Seat | Ibiza / Cordoba | AYP, BJX, ASZ, BPX | Gas / Diesel |
| Skoda | Octavia | AGU, ARX, AUQ, ALH, ASZ | Gas / Diesel |
| Skoda | Superb | AWT, AMX, AWX, AVF | Gas / Diesel |
| OE Part Numbers | 059919501A / 059 919 501 A / 059919501 / 078919501C / 078 919 501 C | ||
Compliance Notice: All vehicle brand names, model designations, and engine codes listed below are referenced strictly to provide technical fitment and compatibility information.
Wholesale Trading Terms
MOQ
Our coolant temperature sensor 059919501A, standard minimum MOQ is 10 pieces per model. We also accept mixed orders of different sensor models to meet your diverse sourcing needs.
Delivery Time
For all in-stock coolant temperature sensor, we can arrange shipment within 3-7 business days. For large-volume wholesale orders, the production and delivery cycle is approximately 20 to 25 business days.
Warranty Policy
Coolant temperature sensor 059919501A, come with a 12-month OE-quality warranty. If any manufacturing defect occurs within the warranty period, send us a video and we’ll offer a free return or exchange.
OEM & Private Label Service
Our branded packaging can be customized in terms of size, raw materials, and packaging processes to meet the needs of different regional markets. Furthermore, we offer flexible and reliable production partnerships for global wholesalers, distributors, bulk buyers, and trading companies. In short, we provide a one-stop private label service, including laser-engraved logos, customized product labels, sealed plastic bags, and color box printing.
Professional Installation Guidelines
- Safety Preparation: Ensure the engine cooling system is completely cold. Slowly loosen the coolant expansion tank reservoir cap to release pressure, then retighten lightly.
- Locate the Sensor: On 1.8T and 2.0L engines, locate the 059919501A sensor mounted on the rear plastic coolant flange attached to the cylinder head; on 2.8L/2.7T V6 engines, locate it on the rear metal coolant cross-pipe.
- Disconnect Harness: Depress the retaining tab on the D-shaped 4-pin electrical plug and gently pull off the connector.
- Remove Retaining Clip: Place a catch pan beneath the engine bay to capture escaping coolant. Pull the plastic U-shaped retaining clip horizontally out of its flange groove.
- Extract Sensor & Old O-Ring: Pull the sensor straight out of the flange. Ensure the old black O-ring comes out; if stuck inside the flange bore, retrieve it with a soft pick.
- Install New Sensor with Lubricated O-Ring: Slide the provided new O-ring over the brass sensing tip of the 059919501A sensor. Lightly wet the O-ring with clean coolant and push the sensor firmly into the flange.
- Lock Clip & Reconnect: Slide the plastic retaining U-clip fully into its slot to lock the sensor flange. Plug in the D-shaped 4-pin wiring connector until it clicks. Refill the cooling system reservoir, bleed any trapped air, run the engine to operating temperature, and verify no leaks.
Help Center
FAQ
Q1: Why are part numbers 059919501A and 078919501C interchangeable across for VW and for Audi?
A: Both numbers denote the identical 4-pin green D-shape sensor. 059919501A is the standard European parts reference, whereas 078919501C is a shared catalog interchange number. Both units use the exact same 20mm clip-in brass stem, electrical pinout, and resistance curves.
Q2: What fault codes and driving symptoms indicate a failing 059919501A sensor?
A: A failing sensor triggers diagnostic trouble codes P0115, P0116, P0117, P0118, P1256, or P1281. Symptoms include hard cold starting, engine flooding with black smoke, erratic radiator fan operation, sudden drops on the dashboard temperature gauge, and decreased fuel mileage.
Q3: What precautions must be followed when replacing this clip-in coolant sensor?
A: Always perform installation on a fully cooled engine to prevent scalding. Remove the old rubber O-ring from the flange housing, lubricate the new O-ring with fresh coolant, push the brass probe firmly into the bore, and slide the plastic U-clip completely into its locking slot.
Q6: What wholesale order terms, MOQs, and warranty are provided for B2B importers?
A: We provide flexible wholesale MOQs starting from 10 units, custom private-label box packaging, and laser batch marking. Every unit undergoes automated thermal resistance calibration and is backed by a 12-month warranty.
