Coolant Temperature Sensor HART 525 840
Sensor Coolant Temperature HART 525 840. Fits 34 car models (ALFA ROMEO, FIAT, FORD +2). Replaces 7 OE numbers.

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Specification. From the manufacturer's data.
- Brand
- HART
- Category
- Sensor Coolant Temperature
- MPN
- 525 840
- SKU
- 5251-525 840
- GTIN / EAN
- 5901219490789
- What's included
- 1x Sensor Coolant Temperature
OE numbers. The originals this part replaces.
Numbers the vehicle makers and other brands use for this part. Only a confirmed OE number links to its own page; other brands' equivalents are under “Equivalent products”.
Where this part fits
Original-fit position for OE 1338270. The red ring marks where this part installs on the vehicle.

Compatible cars. ALFA ROMEO, FIAT, FORD +2, 34 models.
Matched from the manufacturer's data.
Sensor Coolant Temperature for ALFA ROMEOSensor Coolant Temperature for FIATSensor Coolant Temperature for FORDSensor Coolant Temperature for LANCIASensor Coolant Temperature for OPEL
| Model | Engines | Years |
|---|---|---|
| ALFA ROMEO2 models | ||
| ALFA ROMEO GIULIETTA (940) | 1.4 BiFuel (940FXA1A, 940FXT1A), 1.4 TB (940FXA1A, 940FXT1A), 1.4 TB (940FXB1A, 940FXB11), 1.4 TB (940FXN1A, 940FXU1A) | 2010–2020 |
| ALFA ROMEO MITO (955) | 0.9 TwinAir (955.AXW1B), 1.4 (955.AXB1B, 955.AXU1A), 1.4 (955AXB1B, 955.AXF1B), 1.4 (955AXB1B), 1.4 (955AXV1A), 1.4 Bifuel (955.AXG1A), 1.4 Bifuel (955AXG1A), 1.4 TJet (955AXD1B), 1.4 TJet (955AXG1A), 1.4 Turbo MultiAir (955AXM1A, 955AXR11), 1.4 Turbo MultiAir (955AXS1B, 955AXS11) | 2008–2018 |
| FIAT25 models | ||
| FIAT 500 (312) | 0.9 (312AXG1A, 312.AXG11), 0.9 (312AXH1A), 0.9 (312AXM1B), 0.9 (312AXN1A), 0.9 (312AXP1A), 1.2 (312AXA1A), 1.4 (301J410), 1.4 (312AXC1B, 312CXC1B) | 2007– |
| FIAT 500 C (312) | 0.9 (312AG1A), 0.9 (312AXH1A), 0.9 (312AXM1B), 0.9 (312AXN1A, 312AXN11), 0.9 (312AXP1A), 1.2 (312CXA1A, 312AXA1A), 1.4 (301J410), 1.4 (312CXC1B, 312AXC1B) | 2009– |
| FIAT 500L (351, 352) | 0.9 (199LYC1B), 0.9 Natural Power (199LYC1B), 1.3 D Multijet (199.LYM11, 199.LYM1A), 1.3 D Multijet (199LXY1A, 199LXY11), 1.4 (199LYB1B), 1.4 (199LYF1B), 1.4 LPG (199LYF1B) | 2012– |
| FIAT 500X (334) | 1.3 (334.AXR11), 1.4 (334AXC1B, 334AXC11), 1.4 (334AXC1B), 1.4 4x4 (334AXF22), 1.4 LPG (334AXL1B) | 2014– |
FIAT21 more models
| Model | Engines | Years |
|---|---|---|
| FIAT BRAVO II (198) | 1.4 16V (198AXS1B), 1.4 T-Jet (198AXF1B), 1.4 T-Jet (198AXG1B) | 2006–2016 |
| FIAT DOBLO Box Body/MPV (223) | 1.4 | 2000– |
| FIAT DOBLO Bus (263) | 1.4 (263AXA1A), 1.4 (263AXG1B, 263AXG1A), 1.4 Natural Power (263AXG1B) | 2009–2023 |
| FIAT DOBLO Cargo (263) | 1.4, 1.4 Natural Power | 2010– |
| FIAT DOBLO MPV (119, 223) | 1.4 | 2001– |
| FIAT DOBLO Platform/Chassis (263) | 1.4 | 2010–2023 |
| FIAT FIORINO Box Body/MPV (225) | 1.4 Natural Power (225BXC1A, 225AXC1A) | 2007– |
| FIAT GRANDE PUNTO (199) | 1.2, 1.4 (199AXB11, 199AXB1A, 199BXB1A, 199AXL1A), 1.4 (199AXB1A), 1.4 16V (199BXG1B, 199AXG1B), 1.4 LPG, 1.4 Natural Power, 1.4 T-Jet (199AXM1A, 199BXM1A, 199BXN1A) | 2005– |
| FIAT IDEA (350) | 1.4, 1.4 16V, 1.4 LPG | 2003– |
| FIAT LINEA (323, 110) | 1.4, 1.4 T-Jet (323AXC1A), 1.6 (323.AXF1A) | 2006– |
| FIAT PANDA (169) | 1.2 (169.AXB11, 169.AXB1A), 1.2 (169AXF2A, 169AXF1A), 1.2 4x4 (169.AXB2A), 1.2 4x4 (169AXF2A, 169AXF1A), 1.2 LPG (169.AXB1A), 1.2 LPG (169CXF1A), 1.2 Natural Power (169.AXB1A), 1.4 (169AXE1B), 1.4 Natural Power (169AXHIA) | 2003– |
| FIAT PANDA (312, 319) | 0.9 (312PXG1A), 0.9 (312PXH1A), 0.9 (312PXN1A, 312PXN11), 0.9 (312PXP1A), 0.9 4x4 (312PXG1A), 0.9 4x4 (312PXR2B), 0.9 Natural Power (312PXG1A, 312PYC1A), 0.9 Natural Power (312PXN1A), 1.0 Mild Hybrid (312.PYD1B), 1.2 (312PXA1A), 1.2 LPG (312PXA1A), 1.3 D Multijet (312PXL1A), 1.3 D Multijet (312PXU1A, 312PXW1A) | 2012– |
| FIAT PANDA VAN (312, 519) | 0.9 (312.PXN1A), 0.9 (312CXH1A, 312DXH1A), 0.9 (312DXG1A), 0.9 4x4 (312CXG2B), 0.9 Natural Power (312CXG1A), 0.9 Natural Power (312DXG1A), 1.2 (312CXA1A, 312DXA1A), 1.2 LPG (312CXA1A) | 2012– |
| FIAT PUNTO (199) | 0.9 Bifuel, 0.9 Twinair Turbo, 1.2 (199AXZ1A, 199BXZ1A), 1.2 (199AYL1A, 199BYL1A), 1.4 (199AXB1A, 199BXB1A, 199BXB11, 199AXB11), 1.4 (199AXH1A, 199BXH1A), 1.4 Multi Air, 1.4 Turbo Multi Air | 2012– |
| FIAT PUNTO EVO (199) | 1.2, 1.4 (199AXB1A), 1.4 (199AXH1A), 1.4 16V, 1.4 16V (199AXW1A) | 2008– |
| FIAT QUBO (225) | 1.4 (225AXA1A, 225CXA1A), 1.4 Natural Power (225AXC1A) | 2008– |
| FIAT STILO (192) | 1.4 16V, 1.4 16V (192AXH1B, 192BXH1B) | 2001–2010 |
| FIAT STILO Multi Wagon (192) | 1.4 16V | 2003–2008 |
| FIAT TIPO Estate (356, 357) | 1.3 D (356WXH1A), 1.4 (356WXA1B), 1.4 (356WXF1B), 1.4 LPG (356WXF1B), 1.6 D (356WXG1B) | 2016– |
| FIAT TIPO Hatchback (356, 357) | 1.3 D (356HXH1A), 1.4 (356HXA1B, 357), 1.4 (356HXF1B), 1.4 LPG (356HXF1B), 1.6 D (356HXG1B, 356HXG11) | 2016– |
| FIAT TIPO Saloon (356, 357) | 1.3 D (356SXB1A, 356SXH1A, 356SXD1A), 1.4 (356SXA1B), 1.4 LPG (356SXF1B), 1.6 D (356SXG1B) | 2015– |
FORD1 model
| Model | Engines | Years |
|---|---|---|
| FORD KA (RU8) | 1.2 | 2008–2016 |
LANCIA4 models
| Model | Engines | Years |
|---|---|---|
| LANCIA DELTA III (844) | 1.4 (844.AXA1A), 1.4 (844.AXB1A), 1.4 16V (844.AXL1A), 1.4 Bifuel (844.AXA1A) | 2008–2014 |
| LANCIA MUSA (350) | 1.4 (350.AXA11, 350.AXA1A), 1.4 (350.AXE1A), 1.4 (350.AXF1A), 1.4 LPG (350.AXF1A) | 2004–2012 |
| LANCIA YPSILON (312) | 0.9 CNG (312.YXG1A), 0.9 TwinAir (312.PXG11, 312.PXG1A, 312.YXG11, 312.YXG1A), 0.9 TwinAir (312.YXN11, 312.YXN1A), 1.2 (312.PXA1A, 312.YXA1A), 1.2 Bi-fuel (312.YXA1A) | 2011– |
| LANCIA YPSILON (843) | 1.2 (843.AXA1A), 1.2 (843.AXB1A), 1.2 (843.AXL1A), 1.4 (843.AXG1A), 1.4 LPG (843.AXG1A) | 2003–2011 |
OPEL2 models
| Model | Engines | Years |
|---|---|---|
| OPEL COMBO Box Body/MPV (X12) | 1.4 (B05), 1.4 CNG (B05) | 2012– |
| OPEL COMBO Tour (X12) | 1.4 (C26, D26, E26, C06), 1.4 CNG (C26, D26, E26, C05) | 2012– |
Always verify compatibility with your vehicle before ordering.
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HART
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Common OE numbers for this part
Common original equipment numbers linked to replacement-part pages.
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2-year warranty against manufacturing defects on all parts, counted from delivery. 14-day money-back guarantee if the part doesn't fit your vehicle. Delivery terms
We ship from the EU to 201 countries. Deliveries within the EU carry no customs charges; outside the UK and the EU, the destination country may charge import duties and taxes, paid on delivery. Delivery times and prices by country
Delivery times to EU countries (working days)
Austria 4–7, Belgium 4–7, Bulgaria 5–9, Croatia 5–9, Cyprus 4–19, Czechia 4–7, Denmark 4–8, Estonia 3–4, Finland 6–10, France 5–8, Germany 3–5, Greece 6–10, Hungary 4–7, Ireland 5–9, Italy 5–9, Latvia 2–3, Lithuania 2–3, Luxembourg 4–7, Malta 4–9, Netherlands 4–7, Poland 3–6, Portugal 6–10, Romania 4–8, Slovakia 4–7, Slovenia 4–8, Spain 6–9, Sweden 5–10
