Hyundai / Kia 3-Pin Headlight / Oxygen Sensor Waterproof Connector – OEM HN032-03020 / HN036-03027
Direct OEM-specification replacement for the Hyundai / Kia 3-pin waterproof wire harness connector used on headlight assemblies and oxygen (lambda) sensor harnesses across Hyundai and Kia platforms. Cross-references OEM part numbers HN032-03020 and HN036-03027. Grey nylon housing with waterproof sealing — designed for both exterior lighting and underbonnet sensor applications where moisture resistance is required.
The 3-pin waterproof connector is used across two critical circuits on Hyundai and Kia vehicles. As a headlight connector, it is located in the front bumper area and is exposed to road spray, stone chips, and temperature cycling — causing the locking tab to fracture and the terminals to corrode, resulting in a dead headlight or intermittent lighting fault. As an oxygen sensor connector, it is located in the exhaust system heat zone, where thermal cycling causes the rubber seal to harden and crack, allowing moisture to corrode the terminals and produce P0130–P0167 (O2 sensor circuit) fault codes and increased fuel consumption.
| OEM Number | Application |
|---|---|
| HN032-03020 | Hyundai/Kia 3-pin waterproof connector (primary) |
| HN036-03027 | Hyundai/Kia 3-pin waterproof connector (alternate) |
| Pin | Function (O2 Sensor) | Failure Symptom if Open |
|---|---|---|
| 1 | Heater power supply (12V) | O2 sensor heater fault, P0135/P0141 |
| 2 | Heater ground | Sensor slow to reach operating temperature |
| 3 | O2 signal output | P0130–P0167, rich/lean fault, high fuel consumption |
| Attribute | Detail |
|---|---|
| Pin Count | 3-Pin |
| Housing Material | Nylon, grey |
| Sealing | Waterproof |
| OEM Part Numbers | HN032-03020 / HN036-03027 |
| Applications | Headlight harness, oxygen / lambda sensor harness |
| Compatible Brands | Hyundai, Kia |
| Terminal Included | Yes |
Q: My Hyundai has a P0135 O2 sensor heater fault — could it be the connector?
A: Yes. A corroded or open 3-pin O2 sensor connector is a common cause of P0135 (upstream O2 sensor heater circuit) on Hyundai and Kia vehicles. Test the O2 sensor heater resistance first (typically 5–20Ω) — if it is within specification, the fault is in the connector or wiring.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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