Walker 225-1138 Manifold Absolute Pressure Sensor

Walker 225-1138 MAP Sensor Overview

Walker 225-1138 is a Manifold Absolute Pressure Sensor built as an OE replacement for precise intake manifold pressure measurement. It communicates pressure data to the ECM so fuel delivery and ignition timing can be adjusted for engine load, drivability, fuel economy, and emissions control. Compatible With 2001-2003 Toyota Prius, this Walker Sensor Only part is built for direct electrical and connector fit.

The Sensor Only line from Walker focuses on replacement sensors engineered to match OE specifications for output, pressure range, and connector fit. For Toyota Prius MAP sensor replacement needs, 225-1138 is a direct-fit option for restoring accurate manifold vacuum signal input.

Key Features

• Manifold Absolute Pressure Sensor for engine management systems
• OE replacement design for electrical output and pressure range
• Black plastic body with oblong female connector
• 3-terminal, spade-style connection
• Built for high engine bay temperatures, vibration, and intake air contaminants
• Compatible With 2001-2003 Toyota Prius, manifold vacuum sensor application

Detailed Product Description

Walker 225-1138 measures intake manifold pressure and sends that signal to the ECM, where it is used to calculate engine load. That data helps the engine control system manage fuel injection and ignition timing for stable operation and emissions performance. This MAP sensor is engineered to meet OE expectations for connector shape, terminal layout, and signal output, making it a practical replacement for a failing Toyota Prius manifold vacuum sensor.

This part cross-references Delphi FG0053 for the same application. The Walker Sensor Only line is focused on replacement electronics that match factory-style fit and function, and 225-1138 is listed for 2001-2003 Toyota Prius models.

Common Issues This Part Can Help Address

• Check engine light related to MAP sensor signal faults
• Rough idle or unstable engine speed
• Poor fuel economy caused by incorrect load calculation
• Hesitation, surging, or reduced throttle response
• Emissions performance problems tied to inaccurate manifold pressure readings

Installation Notes and Tips

Verify the connector style, terminal count, and sensor body shape before installation. On 2001-2003 Toyota Prius applications, confirm the manifold vacuum sensor location and inspect the harness connector for corrosion, bent terminals, or damaged locking tabs before connecting the new sensor. Clear diagnostic trouble codes after installation and confirm the ECM receives a stable pressure signal.

Quality Assurance

Walker Products engineers this MAP sensor to OE specifications for electrical output, pressure range, and connector fit. Each unit is tested for accuracy, responsiveness, and long-term reliability to support consistent engine management performance in Toyota Prius applications.