2-Pin 1.5mm Knock Sensor Connector OEM 34752-0204 / 347520204 – Buick Lacrosse / GL8 / LZC / FirstLand
Direct OEM-specification replacement for the 2-pin 1.5mm waterproof connector used on engine knock sensors across Buick and SAIC-GM platforms. OEM cross-reference: 34752-0204 (also written as 347520204). A corroded or damaged knock sensor connector is a leading cause of P0325 and P0327 fault codes — the ECU loses knock feedback and defaults to retarded ignition timing, causing noticeable power loss and increased fuel consumption.
| OEM Number | Application |
|---|---|
| 34752-0204 | Knock sensor harness connector – Buick / SAIC-GM primary |
| 347520204 | Alternate format (same part, no hyphen) |
| Pin | Function | Typical Wire Color | Failure Symptom if Open/Corroded |
|---|---|---|---|
| 1 | Knock sensor signal (piezoelectric output) | Pink/Black | P0325 – Knock Sensor 1 Circuit Malfunction |
| 2 | Knock sensor ground / shield | Black/White | P0327 – Knock Sensor 1 Circuit Low Input; ignition timing retard |
| Attribute | Detail |
|---|---|
| Pin Count | 2-Pin |
| Terminal Pitch | 1.5mm |
| OEM Numbers | 34752-0204 / 347520204 |
| Housing Material | PA66 nylon, waterproof sealed |
| Sealing | Individual wire seals |
| Application | Engine knock sensor harness |
| Compatible Brands | Buick (SAIC-GM), Chevrolet (select models) |
| Code | Description |
|---|---|
| P0325 | Knock Sensor 1 Circuit Malfunction (Bank 1) |
| P0327 | Knock Sensor 1 Circuit Low Input (Bank 1) |
| P0328 | Knock Sensor 1 Circuit High Input (Bank 1) |
Q: My Buick Lacrosse has P0325 — is it the knock sensor or the connector?
A: P0325 on Buick Lacrosse is frequently caused by a corroded 2-pin connector rather than a failed knock sensor. Before replacing the sensor ($30–60), inspect the 34752-0204 connector for green corrosion or bent pins. Disconnect, clean with electrical contact cleaner, reconnect and clear codes — if P0325 does not return, the connector was the fault.
Q: What happens if I drive with P0325 / P0327?
A: The ECU loses knock feedback and defaults to a conservative ignition timing map (typically 4–8° retard from optimal). This causes measurable power loss (5–10%), increased fuel consumption, and potential long-term engine damage if detonation occurs undetected. Address the fault promptly.
Q: What is the difference between 34752-0204 and 347520204?
A: They are the same part number — 34752-0204 is the hyphenated OEM format; 347520204 is the same number written without hyphens. Both refer to the identical connector.
Q: Are terminals included?
A: Yes, terminals and wire seals are included with all variants.
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2 Pin Connectors
