Sea-Doo & Williams Pressure Sensor – Part No. 420274057

Description

This pressure sensor, OEM part number 420274057, is a replacement part for the Sea-Doo and Williams applications listed below. It restores the pressure measurement transmitted to the engine management system when diagnostics confirm a sensor fault. According to the data sheet, the affected engines are the Rotax 903, Rotax 1503, and Rotax 1630, subject to part number matching and original installation.

Technical Specifications

• OEM part number: 420274057
• Manufacturer part number: not specified
• Type: pressure sensor
• Condition: New
• Packaging: individual
• Weight: 0.25 kg, recorded product value
• Regulated substances: information not provided
• Installation: replace after verifying the part number, connector, and installation; follow the relevant engine workshop procedure and inspect the wiring harness before replacement

Compatibility

Sea-Doo personal watercraft: applications retained from the existing data sheet. Years are not specified.

• Sea-Doo GTX (130 / 155 / 215 / 255 / 260 HP)
• Sea-Doo GTI (130 / 150 / 155 / 185 HP)
• Sea-Doo GTR / GTS
• Sea-Doo RXP / RXT (215 / 255 / 260 HP)

Williams jet boats: applications carried over from the product description and tags, without the addition of years.

• Williams 280 Minijet
• Williams 285 Turbojet
• Williams 325 Turbojet
• Williams 345 Sportjet
• Williams 395 Sportjet
• Williams 435 Sportjet (Rotax 903)
• Williams 435 Sportjet (Rotax 1503)
• Williams 435 Sportjet (Rotax 1630)
• Williams 400 Sportjet (Rotax 1503, according to the product tag)
• Williams 460 Sportjet (Rotax 1503)
• Williams 460 Sportjet (Rotax 1630)
• Williams 520 Sportjet (Rotax 1503)
• Williams 520 Sportjet (Rotax 1630)

⚠️ Always check your serial number (VIN) and the original OEM part number before ordering to confirm exact compatibility with your model.

Why Replace the Pressure Sensor?

An incorrect pressure measurement can disrupt engine management. Before replacement, have the sensor, its connector, and the wiring harness inspected: a measurement fault does not necessarily stem from the sensor alone.

• Fault code related to pressure measurement
• Inconsistent pressure value identified during diagnostics
• Damaged sensor connector or housing
• Irregular engine operation or power loss requiring inspection

During maintenance and before seasonal commissioning, check the condition of the connections and for any signs of oxidation. Replace the sensor when diagnostics justify it, then check the measured values and ensure there are no faults according to the manufacturer's procedure.

See Also – Other Engine Sensors

These complementary sensors are for monitoring the engine and intake. Check their specific applications: they are not substitutes for the 420274057 sensor and are not necessarily suitable for all the models listed above.

Sea-Doo & Williams Knock Sensor – 420664031

Sea-Doo Intake Temperature Sensor – 420222427 / 420222423