AIC 51909 Coolant Temperature Sensor

Compatible with AUDI 80 B3 Sedans (893, 894, 8A2) , AUDI 100 C3 Sedans (443, 444) , AUDI 200 C3 Sedans (447, 448) Show more info
This AIC coolant temperature sensor, part number 51909, is designed to accurately monitor your vehicle's engine temperature. Ensure optimal engine performance and prevent overheating with this reliable component.
3.62 EUR
inc. VAT 21%
In stock 3
Delivery 1 day (14.09.2026)
PN 51909
Make AIC
EAN 4046283519095

The AIC 51909 Coolant Temperature Sensor plays a crucial role in your vehicle's engine management system. By accurately measuring the coolant temperature, it provides vital data to the engine control unit (ECU). This information allows the ECU to adjust fuel injection timing, ignition timing, and idle speed for optimal performance and fuel efficiency. A malfunctioning temperature sensor can lead to poor fuel economy, rough idling, and potential engine damage due to overheating. Crafted by AIC, a reputable manufacturer of automotive parts, this sensor is built to meet stringent quality standards. It is designed for direct replacement, ensuring a straightforward installation process for mechanics and DIY enthusiasts alike.

  • Part Number: 51909
  • Brand: AIC
  • Function: Monitors coolant temperature
  • Ensures optimal engine performance
  • Helps prevent engine overheating
  • Direct replacement part
  • Reliable AIC quality
Additional article/Additional info 2
with sealing ring
Number of pin contacts
2
  • AUDI
    • 80 B3 Sedans (893, 894, 8A2)
      • 1.6 (55kW/75PS)
      • 1.8 (55kW/75PS)
      • 1.8 S (65kW/88PS)
      • 1.8 S (66kW/90PS)
      • 1.8 E (82kW/112PS)
      • 1.8 (83kW/113PS)
      • 2.0 E (83kW/113PS)
      • 1.6 D (40kW/54PS)
      • 1.6 TD (59kW/80PS)
      • 1.9 D (50kW/68PS)
      • 1.6 (51kW/70PS)
      • 2.0 E 16V (101kW/137PS)
      • 1.8 S quattro (65kW/88PS)
      • 1.8 S quattro (66kW/90PS)
      • 1.8 quattro (83kW/113PS)
      • 2.0 E quattro (83kW/113PS)
      • 2.0 quattro (85kW/115PS)
      • 2.0 E 16V quattro (101kW/137PS)
      • 2.0 E (82kW/112PS)
      • 1.8 E quattro (82kW/112PS)
      • 1.4 (48kW/65PS)
      • 1.6 (75kW/102PS)
    • 100 C3 Sedans (443, 444)
      • 1.8 (65kW/88PS)
      • 1.8 Cat (66kW/90PS)
      • 2.0 Cat (85kW/115PS)
      • 2.2 Turbo (121kW/165PS)
      • 2.3 E (100kW/136PS)
      • 2.0 D Turbo (74kW/100PS)
      • 2.5 TDI (88kW/120PS)
      • 1.8 quattro (65kW/88PS)
      • 1.8 Cat quattro (66kW/90PS)
      • 2.2 quattro (101kW/137PS)
      • 2.2 E Turbo quattro (121kW/165PS)
      • 2.3 E quattro (100kW/136PS)
      • 2.4 D (60kW/82PS)
      • 1.8 (66kW/90PS)
      • 1.8 quattro (66kW/90PS)
      • 2.2 Cat quattro (101kW/137PS)
      • 2.2 Cat (101kW/137PS)
    • 200 C3 Sedans (447, 448)
      • 2.2 Turbo (121kW/165PS)
      • 2.2 Turbo quattro (121kW/165PS)
      • 2.2 Turbo quattro (147kW/200PS)
      • 2.2 Turbo (140kW/190PS)
      • 2.2 Turbo (147kW/200PS)
    • COUPE B3 (89, 8B3)
      • 2.3 (100kW/136PS)
      • 2.0 (85kW/115PS)
      • 2.0 16 V (103kW/140PS)
      • 2.3 (98kW/133PS)
      • 2.6 (110kW/150PS)
      • 2.8 (128kW/174PS)
      • 2.3 quattro (100kW/136PS)
      • 2.3 20V quattro (125kW/170PS)
      • 2.3 quattro (98kW/134PS)
      • 2.6 quattro (110kW/150PS)
      • 2.8 quattro (128kW/174PS)
      • 2.3 20V (125kW/170PS)
      • 1.8 (82kW/112PS)
      • 2.2 quattro (100kW/136PS)
      • 2.0 16 V (101kW/137PS)
      • 2.0 (82kW/112PS)
      • 2.0 (83kW/113PS)
    • 100 C4 Sedans (4A2)
      • 2.4 D (60kW/82PS)
      • 2.5 TDI (85kW/115PS)
      • 2.0 (74kW/100PS)
      • 2.0 E (85kW/115PS)
      • 2.3 E (98kW/133PS)
      • 2.6 (110kW/150PS)
      • 2.8 E (128kW/174PS)
      • S4 Turbo quattro (169kW/230PS)
      • 2.3 E quattro (98kW/133PS)
      • 2.6 quattro (110kW/150PS)
      • 2.8 E quattro (128kW/174PS)
      • S4 V8 quattro (206kW/280PS)
      • 2.0 E quattro (85kW/115PS)
      • 2.0 E 16V (103kW/140PS)
    • 80 B4 Sedans (8C2)
      • 1.9 TD (55kW/75PS)
      • 1.9 TDI (66kW/90PS)
      • 1.6 (52kW/71PS)
      • 1.6 E (74kW/101PS)
      • 2.0 (66kW/90PS)
      • 2.0 E (85kW/115PS)
      • 2.0 E 16V (103kW/140PS)
      • 2.3 E (98kW/133PS)
      • 2.6 (110kW/150PS)
      • 2.8 (128kW/174PS)
      • 2.0 E 16V quattro (103kW/140PS)
      • 2.0 E quattro (85kW/115PS)
      • S2 quattro (169kW/230PS)
      • 2.3 E quattro (98kW/133PS)
      • 2.6 quattro (110kW/150PS)
      • 2.8 quattro (128kW/174PS)
      • 2.0 E 16V (101kW/137PS)
    • 100 C3 Avant (445, 446)
      • 1.8 (65kW/88PS)
      • 1.8 (66kW/90PS)
      • 2.0 E Cat (85kW/115PS)
      • 2.2 Turbo (121kW/165PS)
      • 2.3 (100kW/136PS)
      • 2.0 TD (74kW/100PS)
      • 2.5 TDI (88kW/120PS)
      • 2.2 Turbo quattro (121kW/165PS)
      • 2.3 E quattro (100kW/136PS)
      • 2.4 D (60kW/82PS)
      • 1.8 quattro (65kW/88PS)
      • 1.8 Cat quattro (66kW/90PS)
      • 1.8 quattro (66kW/90PS)
      • 2.2 Cat (101kW/137PS)
      • 2.2 Cat quattro (101kW/137PS)
      • 1.8 Cat (66kW/90PS)
    • 80 B4 Avant (8C5)
      • 2.0 (66kW/90PS)
      • 2.0 E (85kW/115PS)
      • 2.0 E 16V (103kW/140PS)
      • 2.3 E (98kW/133PS)
      • 2.6 (110kW/150PS)
      • S2 quattro (169kW/230PS)
      • 2.6 quattro (110kW/150PS)
      • 2.8 quattro (128kW/174PS)
      • RS2 quattro (232kW/315PS)
      • 2.3 E quattro (98kW/133PS)
      • 1.9 TDI (66kW/90PS)
      • 1.6 E (74kW/101PS)
      • 2.8 (128kW/174PS)
      • 2.0 E 16V quattro (103kW/140PS)
      • 1.9 TD (55kW/75PS)
    • 100 C4 Avant (4A5)
      • 2.5 TDI (85kW/115PS)
      • 2.0 E (74kW/100PS)
      • 2.0 E (85kW/115PS)
      • S4 Turbo quattro (169kW/230PS)
      • 2.6 (110kW/150PS)
      • 2.3 E (98kW/133PS)
      • 2.8 E (128kW/174PS)
      • 2.3 E quattro (98kW/133PS)
      • 2.6 quattro (110kW/150PS)
      • 2.8 E quattro (128kW/174PS)
      • S4 V8 quattro (206kW/280PS)
      • 2.0 E quattro (85kW/115PS)
      • 2.4 D (60kW/82PS)
      • 2.0 E 16V (103kW/140PS)
    • 90 B3 (893, 894, 8A2)
      • 2.0 (85kW/115PS)
      • 2.3 E (100kW/136PS)
      • 2.3 E (98kW/133PS)
      • 2.3 E 20V (123kW/167PS)
      • 2.3 E quattro (100kW/136PS)
      • 2.3 E 20V quattro (125kW/170PS)
      • 2.3 E quattro (98kW/133PS)
      • 2.3 E 20V quattro (123kW/167PS)
      • 2.2 E (100kW/136PS)
      • 2.2 E quattro (100kW/136PS)
      • 2.3 E 20V (125kW/170PS)
      • 1.6 TD (59kW/80PS)
      • 2.0 20 V (118kW/160PS)
      • 2.0 20 V quattro (118kW/160PS)
    • CABRIOLET B3 (8G7)
      • 2.0 E (85kW/115PS)
    • 200 C3 Avant (447, 448)
      • 2.2 Turbo quattro (121kW/165PS)
      • 2.2 Turbo quattro (147kW/200PS)
    • A6 C4 (4A2)
      • 1.9 TDI (66kW/90PS)
      • 2.5 TDI (103kW/140PS)
      • 2.0 (74kW/100PS)
      • 2.0 (85kW/115PS)
      • 2.0 16V (103kW/140PS)
      • 2.5 TDI (85kW/116PS)
      • 2.0 16V quattro (103kW/140PS)
      • S6 Turbo quattro (169kW/230PS)
      • 2.5 TDI quattro (103kW/140PS)
      • 1.8 (92kW/125PS)
      • 1.8 quattro (92kW/125PS)
      • 2.3 (98kW/133PS)
      • 2.3 quattro (98kW/133PS)
    • A6 C4 Avant (4A5)
      • 1.9 TDI (66kW/90PS)
      • 2.5 TDI (103kW/140PS)
      • 2.0 (74kW/100PS)
      • 2.0 (85kW/115PS)
      • 2.0 16V (103kW/140PS)
      • 2.5 TDI (85kW/116PS)
      • 2.0 16V quattro (103kW/140PS)
      • S6 Turbo quattro (169kW/230PS)
      • 2.5 TDI quattro (103kW/140PS)
      • 1.8 (92kW/125PS)
      • 1.8 quattro (92kW/125PS)
      • 2.3 (98kW/133PS)
      • 2.3 quattro (98kW/133PS)
    • A4 B5 (8D2)
      • 1.6 (74kW/100PS)
      • 1.8 (92kW/125PS)
      • 1.8 T (110kW/150PS)
      • 1.9 TDI (66kW/90PS)
      • 1.8 quattro (92kW/125PS)
      • 1.8 T quattro (110kW/150PS)
      • 1.9 TDI (81kW/110PS)
      • 1.9 TDI quattro (81kW/110PS)
      • 1.9 TDI (85kW/116PS)
      • 1.8 T quattro (132kW/180PS)
      • 1.8 T (132kW/180PS)
      • 1.9 TDI quattro (85kW/116PS)
      • 1.9 TDI (55kW/75PS)
      • 1.6 (75kW/102PS)
    • A4 B5 Avant (8D5)
      • 1.6 (74kW/100PS)
      • 1.8 (92kW/125PS)
      • 1.8 T (110kW/150PS)
      • 1.9 TDI (66kW/90PS)
      • 1.9 TDI (81kW/110PS)
      • 1.8 quattro (92kW/125PS)
      • 1.8 T quattro (110kW/150PS)
      • 1.9 TDI quattro (81kW/110PS)
      • 1.9 TDI (85kW/115PS)
      • 1.8 T quattro (132kW/180PS)
      • 1.8 T (132kW/180PS)
      • 1.9 TDI quattro (85kW/115PS)
      • 1.6 (75kW/102PS)
      • 1.9 Hybrid (66kW/90PS)
  • VW
    • POLO II (86C, 80)
      • 1.3 Cat (40kW/55PS)
      • 1.0 Cat (33kW/45PS)
      • 1.3 Cat (55kW/75PS)
    • GOLF II (19E, 1G1)
      • 1.3 (40kW/55PS)
      • 1.6 (51kW/70PS)
      • 1.6 (53kW/72PS)
      • 1.6 (55kW/75PS)
      • 1.8 GTI G60 Syncro (118kW/160PS)
      • 1.8 (62kW/84PS)
      • 1.8 Syncro (66kW/90PS)
      • 1.8 i Cat (66kW/90PS)
      • 1.8 Syncro (72kW/98PS)
      • 1.8 GTI Cat (79kW/107PS)
      • 1.8 GTI (82kW/112PS)
      • 1.8 GTI 16V (95kW/129PS)
      • 1.8 GTI 16V (102kW/139PS)
      • 1.8 GTI G60 (118kW/160PS)
      • 1.6 D (40kW/54PS)
      • 1.6 TD (51kW/70PS)
      • 1.6 TD (59kW/80PS)
      • 1.6 TD (44kW/60PS)
      • 1.3 Cat (40kW/55PS)
      • 1.8 GTI (79kW/107PS)
      • 1.8 (66kW/90PS)
      • 1.3 (37kW/50PS)
    • JETTA II (19E, 1G2, 165)
      • 1.3 (40kW/55PS)
      • 1.6 (51kW/70PS)
      • 1.6 (53kW/72PS)
      • 1.6 (55kW/75PS)
      • 1.8 (62kW/84PS)
      • 1.8 Cat (66kW/90PS)
      • 1.8 Cat (79kW/107PS)
      • 1.8 (82kW/112PS)
      • 1.8 16V (95kW/129PS)
      • 1.8 16V (102kW/140PS)
      • 1.6 D (40kW/54PS)
      • 1.6 TD (51kW/70PS)
      • 1.6 TD (59kW/80PS)
      • 1.6 TD (44kW/60PS)
      • 1.8 Syncro (72kW/98PS)
      • 1.8 Syncro (66kW/90PS)
      • 1.3 Cat (40kW/55PS)
      • 1.8 (79kW/107PS)
      • 1.8 (66kW/90PS)
    • PASSAT B3/B4 (3A2, 35I)
      • 1.6 (53kW/72PS)
      • 1.8 (79kW/107PS)
      • 1.8 (82kW/112PS)
      • 2.0 (85kW/115PS)
      • 1.9 TDI (66kW/90PS)
      • 1.8 (55kW/75PS)
      • 1.8 (66kW/90PS)
      • 1.8 G60 Syncro (118kW/160PS)
      • 2.8 VR6 (128kW/174PS)
      • 2.0 Syncro (85kW/115PS)
    • SCIROCCO (53B)
      • 1.6 (55kW/75PS)
      • 1.6 (53kW/72PS)
      • 1.8 (66kW/90PS)
      • 1.8 (70kW/95PS)
      • 1.8 (82kW/112PS)
      • 1.8 16V (102kW/139PS)
      • 1.8 16V (95kW/129PS)
      • 1.3 (40kW/55PS)
    • CORRADO (53I)
      • 1.8 G60 (118kW/160PS)
      • 2.9 VR6 (140kW/190PS)
    • TRANSPORTER T4 Autobuss (70B, 70C, 7DB, 7DK, 70J, 70K, 7DC,
      • 2.5 Syncro (81kW/110PS)
      • 2.5 (81kW/110PS)
      • 2.0 (62kW/84PS)
      • 2.5 TDI (75kW/102PS)
      • 2.5 TDI Syncro (75kW/102PS)
      • 2.5 Syncro (85kW/115PS)
      • 2.5 (85kW/115PS)
      • 2.8 VR 6 (103kW/140PS)
    • TRANSPORTER T3 Autobuss (25_)
      • 2.1 (70kW/95PS)
      • 2.1 (82kW/112PS)
      • 2.1 i (68kW/92PS)
      • 2.1 Cat (70kW/95PS)
      • 2.1 Syncro (70kW/95PS)
      • 2.1 Syncro (82kW/112PS)
      • 2.1 (64kW/87PS)
      • 2.1 Syncro (64kW/87PS)
    • TRANSPORTER T3 Furgons (24_, 25_)
      • 2.1 (70kW/95PS)
      • 2.1 Syncro (70kW/95PS)
      • 2.1 Syncro (82kW/112PS)
      • 2.1 (82kW/112PS)
      • 2.1 i (68kW/92PS)
    • GOLF III (1H1)
      • 2.8 VR6 (128kW/174PS)
      • 1.9 SDI (47kW/64PS)
    • VENTO (1H2)
      • 2.8 VR6 (128kW/174PS)
      • 1.9 SDI (47kW/64PS)
    • PASSAT B3/B4 Variant (3A5, 35I)
      • 1.6 (53kW/72PS)
      • 1.8 (79kW/107PS)
      • 1.8 (82kW/112PS)
      • 2.0 (85kW/115PS)
      • 1.9 TDI (66kW/90PS)
      • 1.8 (66kW/90PS)
      • 1.8 G60 Syncro (118kW/160PS)
      • 2.8 VR6 (128kW/174PS)
      • 2.9 VR6 Syncro (135kW/184PS)
    • GOLF I Cabriolet (155)
      • 1.6 (55kW/75PS)
      • 1.8 (66kW/90PS)
      • 1.8 (70kW/95PS)
      • 1.8 (82kW/112PS)
      • 1.8 (72kW/98PS)
    • POLO Coupe (86C, 80)
      • 1.3 G40 (85kW/115PS)
      • 1.0 Cat (33kW/45PS)
      • 1.3 Cat (40kW/55PS)
      • 1.3 Cat (55kW/75PS)
      • 1.3 G40 (83kW/113PS)
    • POLO III (6N1)
      • 45 1.0 (33kW/45PS)
    • SHARAN (7M8, 7M9, 7M6)
      • 1.9 TDI (66kW/90PS)
      • 2.0 (85kW/115PS)
      • 2.8 VR6 (128kW/174PS)
      • 2.8 VR6 Syncro (128kW/174PS)
      • 1.9 TDI (81kW/110PS)
      • 1.8 T 20V (110kW/150PS)
    • CADDY I (14)
      • 1.6 (55kW/75PS)
      • 1.8 (70kW/95PS)
      • 1.6 D (40kW/55PS)
    • POLO CLASSIC (86C, 80)
      • 1.0 (33kW/45PS)
      • 1.3 Cat (40kW/55PS)
    • POLO III CLASSIC (6V2)
      • 75 1.6 (55kW/75PS)
      • 60 1.4 (44kW/60PS)
      • 64 1.9 SDI (47kW/64PS)
      • 100 1.6 (74kW/100PS)
      • 90 1.8 (66kW/90PS)
      • 75 1.6 (55kW/75PS)
      • 54 1.4 (40kW/54PS)
    • CADDY II Furgons/minivens (9K9A)
      • 60 1.4 (44kW/60PS)
      • 1.9 SDI (47kW/64PS)
      • 75 1.6 (55kW/75PS)
      • 1.4 (55kW/75PS)
      • 75 1.6 (55kW/75PS)
    • PASSAT B5 (3B2)
      • 1.6 (74kW/101PS)
      • 1.8 (92kW/125PS)
      • 1.8 T (110kW/150PS)
      • 1.8 Syncro/4motion (92kW/125PS)
    • LT 28-35 I Autobuss (281-363)
      • 2.4 i (69kW/94PS)
    • TRANSPORTER T3 Platforma/Šasija (24_)
      • 2.1 (70kW/95PS)
      • 2.1 Syncro (70kW/95PS)
      • 2.1 Syncro (82kW/112PS)
      • 2.1 (82kW/112PS)
      • 2.1 i (68kW/92PS)
    • TRANSPORTER T4 Furgons (70A, 70H, 7DA, 7DH)
      • 2.0 (62kW/84PS)
      • 2.5 (81kW/110PS)
      • 2.5 Syncro (81kW/110PS)
      • 2.5 (85kW/115PS)
      • 2.5 Syncro (85kW/115PS)
      • 2.5 TDI (75kW/102PS)
      • 2.5 TDI Syncro (75kW/102PS)
    • PASSAT B5 Variant (3B5)
      • 1.6 (74kW/101PS)
      • 1.8 (92kW/125PS)
      • 1.8 T (110kW/150PS)
      • 1.8 Syncro/4motion (92kW/125PS)
    • GOLF III Variant (1H5)
      • 1.9 SDI (47kW/64PS)
    • TRANSPORTER T4 Platforma/Šasija (70E, 70L, 70M, 7DE, 7DL, 7D
      • 2.5 (81kW/110PS)
      • 2.5 Syncro (81kW/110PS)
      • 2.0 (62kW/84PS)
      • 2.5 (85kW/115PS)
      • 2.5 Syncro (85kW/115PS)
      • 2.5 TDI (75kW/102PS)
      • 2.5 TDI Syncro (75kW/102PS)
    • LT 28-35 I Furgons (281-363)
      • 2.4 i (69kW/94PS)
    • LT 28-35 I Platforma/Šasija (281-363)
      • 2.4 i (69kW/94PS)
    • LT 40-55 I Furgons (291-512)
      • 2.4 i (69kW/94PS)
    • LT 40-55 I Platforma/Šasija (293-909)
      • 2.4 i (69kW/94PS)
    • CADDY II Lielas ietilpības automobilis (9K9B)
      • 1.4 (44kW/60PS)
      • 1.4 16V (55kW/75PS)
      • 1.6 (55kW/75PS)
      • 1.6 (55kW/75PS)
      • 1.9 SDI (47kW/64PS)
  • SEAT
    • TOLEDO I (1L2)
      • 1.6 i (54kW/73PS)
      • 1.6 i (52kW/71PS)
      • 1.8 16V (92kW/125PS)
      • 1.6 i (55kW/75PS)
      • 1.9 TDI (66kW/90PS)
    • IBIZA II (6K1)
      • 1.9 SDI (47kW/64PS)
      • 1.9 TD (55kW/75PS)
      • 1.0 (33kW/45PS)
      • 1.3 i (40kW/54PS)
      • 1.6 i (55kW/75PS)
      • 1.8 i (66kW/90PS)
      • 2.0 i (85kW/115PS)
      • 1.4 i (44kW/60PS)
      • 1.8 i 16V (95kW/129PS)
      • 1.6 i (74kW/101PS)
      • 2.0 i 16V (110kW/150PS)
      • 1.4 i 16V (74kW/101PS)
      • 1.9 D (47kW/64PS)
      • 1.0 i (37kW/50PS)
      • 1.6 i (55kW/75PS)
      • 1.4 (40kW/54PS)
    • CORDOBA (6K1, 6K2)
      • 1.4 i (44kW/60PS)
      • 1.6 i (55kW/75PS)
      • 1.8 i (66kW/90PS)
      • 2.0 i (85kW/115PS)
      • 1.9 D (50kW/68PS)
      • 1.9 TD (55kW/75PS)
      • 1.8 i 16V (95kW/129PS)
      • 1.9 SDI (47kW/64PS)
      • 1.6 i (74kW/101PS)
      • 2.0 i 16V (110kW/150PS)
      • 1.9 D (47kW/64PS)
      • 1.4 i 16V (74kW/101PS)
      • 1.0 i (37kW/50PS)
      • 1.6 i (55kW/75PS)
    • INCA (6K9)
      • 1.4 i (44kW/60PS)
      • 1.6 i (55kW/75PS)
      • 1.9 D (47kW/64PS)
      • 1.9 SDI (47kW/64PS)
      • 1.7 D (42kW/57PS)
      • 1.4 16V (55kW/75PS)
      • 1.6 i (55kW/75PS)
    • CORDOBA Vario (6K5)
      • 1.4 i (44kW/60PS)
      • 1.9 SDI (47kW/64PS)
      • 1.6 i (74kW/101PS)
      • 1.6 i (55kW/75PS)
      • 1.6 i (55kW/75PS)
  • LANCIA
    • ZETA (22_)
      • 2.0 16V (220AL5) (97kW/132PS)
  • FIAT
    • ULYSSE (220_)
      • 2.0 JTD 16V (80kW/109PS)
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