MAP Sensor - Sea-Doo 4-TEC Intake Pressure - Ref. 420274057 (130 to 260 hp)

Role of the MAP Sensor on Rotax 4-TEC Engine

The MAP sensor, also known as the Manifold Absolute Pressure sensor, measures the absolute pressure in the intake manifold of the Rotax 4-TEC engine. This data is transmitted in real-time to the ECU to calculate the admitted air mass and adjust fuel injection accordingly.

A faulty MAP sensor directly disrupts engine management: increased fuel consumption, loss of power, unstable idling, or difficult starting. Its replacement is a common diagnostic procedure on Sea-Doo 4-TEC models.

Technical Specifications

• OEM Part Number: 420274057
• Type: Varistor absolute pressure sensor (MAP)
• Signal: Voltage Signal
• Technology: Piezoelectric
• Application: Supercharged and naturally aspirated Rotax 4-TEC engines
• Origin: Aftermarket part with OEM quality

Compatibility – Sea-Doo 4-TEC Models

This MAP sensor is compatible with Sea-Doo models equipped with the Rotax 4-TEC engine in the following versions:

• Sea-Doo 130 hp – GTI, GTI SE
• Sea-Doo 155 hp – GTI SE 155, GTX 155
• Sea-Doo 185 hp – GTX 185, RXT 185
• Sea-Doo 215 hp – GTX 215, RXT 215, RXP 215
• Sea-Doo 255 hp – RXP-X 255, RXT-X 255, GTX Limited 255
• Sea-Doo 260 hp – RXP-X 260, RXT-X 260, GTX Limited 260

Williams Sportjet Tenders

• Williams 435 Sportjet – Sport (Rotax ACE 1503 or ACE 1630)
• Williams 400 Sportjet (Rotax ACE 1503 or ACE 1630)
• Williams 460 Sportjet (Rotax ACE 1503 or ACE 1630)
• Williams 520 Sportjet (Rotax ACE 1503 or ACE 1630)

Verify OEM part number 420274057 on your original sensor before ordering. If in doubt, contact us with your serial number.

Symptoms of a Faulty MAP Sensor

Several signs can indicate a MAP sensor needs replacement:

• Engine fault code related to the MAP sensor or intake pressure
• Significant loss of power, especially at full load
• Unexplained increase in fuel consumption
• Unstable idling or jerking during acceleration
• Difficult starting or engine stalling

Diagnosis can be confirmed via the BRP tool (BUDS2) or an oscilloscope by measuring the sensor's voltage signal.

Replacing the MAP Sensor – Installation Tips

The procedure is accessible to an experienced mechanic:

• Turn off the engine and allow it to cool completely
• Locate the MAP sensor on the intake manifold (refer to the Rotax 4-TEC workshop manual)
• Disconnect the 3-pin electrical connector
• Unscrew the sensor and clean the manifold threads
• Install the new sensor and tighten to the torque recommended by BRP
• Reconnect the connector and clear fault codes after installation