Subaru Subaru Legacy 2005-2009 Emissions & Sensors Specifications
Explore detailed specifications for the emissions sensors in the 2005-2009 Subaru Legacy. Learn about sensor types, functions, and compatibility for diagnostics, repairs, and performance upgrades.
Overview Specifications
This document provides detailed specifications and technical information about the emissions sensors used in the 2005-2009 Subaru Legacy. It is designed to assist technicians, engineers, and enthusiasts in understanding the functionality, maintenance, and troubleshooting of these sensors. The document is organized into sections for easy navigation and includes a quick reference guide for key specifications.
How to Use
Use the search bar to find specific terms or sensor names. Enter keywords like 'O2 sensor' or 'catalytic converter' to quickly locate relevant information.
Navigate through the document using the table of contents. Each section is labeled clearly, and subsections provide detailed information on specific topics related to emissions sensors.
Key Specifications
O2 Sensor Voltage Range
0.1V to 0.9V
Catalytic Converter Temp Range
-40°C to 900°C
EGR Valve Sensor Voltage
5V
Sensor Replacement Interval
100,000-150,000 miles
EGR Temp Sensor Range
-40°C to 300°C
Available Specifications
Oxygen Sensors
This section covers the oxygen sensors used in the 2005-2009 Subaru Legacy, including their location, function, and maintenance requirements. Oxygen sensors are critical for monitoring the air-fuel ratio and ensuring optimal engine performance.
Oxygen Sensors
This section covers the oxygen sensors used in the 2005-2009 Subaru Legacy, including their location, function, and maintenance requirements. Oxygen sensors are critical for monitoring the air-fuel ratio and ensuring optimal engine performance.
Front Oxygen Sensor
- Located before the catalytic converter
- Monitors exhaust gases to adjust fuel mixture
- Heated for faster warm-up and accurate readings
- Replacement interval: 100,000 miles
- Part number: 22641AA00A
- Voltage range: 0.1V to 0.9V
Rear Oxygen Sensor
- Located after the catalytic converter
- Monitors catalytic converter efficiency
- Heated for consistent performance
- Replacement interval: 100,000 miles
- Part number: 22641AA01A
- Voltage range: 0.1V to 0.9V
Catalytic Converter Sensors
This section provides information on the sensors associated with the catalytic converter, which play a vital role in reducing harmful emissions and ensuring compliance with environmental regulations.
Catalytic Converter Sensors
This section provides information on the sensors associated with the catalytic converter, which play a vital role in reducing harmful emissions and ensuring compliance with environmental regulations.
Catalytic Converter Temperature Sensor
- Monitors temperature to prevent overheating
- Located on the catalytic converter body
- Operating range: -40°C to 900°C
- Replacement interval: 150,000 miles
- Part number: 22690AA00A
Catalytic Converter Efficiency Sensor
- Checks the efficiency of the catalytic converter
- Located downstream of the catalytic converter
- Outputs data to the ECU for diagnostics
- Replacement interval: 150,000 miles
- Part number: 22690AA01A
Exhaust Gas Recirculation (EGR) System
This section details the sensors and components of the EGR system, which reduces nitrogen oxide emissions by recirculating a portion of exhaust gases back into the engine.
Exhaust Gas Recirculation (EGR) System
This section details the sensors and components of the EGR system, which reduces nitrogen oxide emissions by recirculating a portion of exhaust gases back into the engine.
EGR Valve Position Sensor
- Monitors the position of the EGR valve
- Ensures proper recirculation of exhaust gases
- Operating voltage: 5V
- Replacement interval: 120,000 miles
- Part number: 22642AA00A
EGR Temperature Sensor
- Measures the temperature of recirculated gases
- Located near the EGR valve
- Operating range: -40°C to 300°C
- Replacement interval: 120,000 miles
- Part number: 22642AA01A
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Component Specifications
Overview
- Type
- Oxygen (O2) Sensor
- Configuration
- Upstream and Downstream
- Platform
- Subaru Legacy 2005-2009
- Material
- Zirconia Ceramic
- Location
- Exhaust Manifold and Catalytic Converter
Dimensions
- Length
- 2.5 inches (63.5 mm)
- Diameter
- 0.75 inches (19.05 mm)
- Thread Size
- M18 x 1.5
- Wire Length
- 24 inches (609.6 mm)
- Operating Temperature
- -40°F to 1500°F (-40°C to 815°C)
- Weight
- 0.25 lbs (113.4 g)
- Voltage Range
- 0.1V to 0.9V
Materials
- Sensor Body
- Stainless Steel
- Sensor Element
- Zirconia Ceramic
- Wiring
- High-Temperature Silicone
- Connector
- Thermoplastic
Features
- Performance
-
- Wideband O2 sensing
- Fast response time (less than 100ms)
- High accuracy in lean and rich conditions
- Durability
-
- Resistant to thermal shock
- Corrosion-resistant housing
- Sealed against moisture and contaminants
- Compatibility
-
- Direct fit for Subaru Legacy models
- Works with OEM and aftermarket ECUs
- Compatible with both gasoline and flex-fuel
- installation
-
- Pre-threaded for easy replacement
- Includes anti-seize compound
- Plug-and-play wiring harness
- Monitoring
-
- Real-time air-fuel ratio feedback
- Self-diagnostic capabilities
- Supports OBD-II protocols
Safety Features
- Thermal Protection
-
- Heat-resistant shielding
- Automatic shutdown at extreme temperatures
- Electrical Safety
-
- Short-circuit protection
- Reverse polarity protection
- Environmental
-
- Lead-free construction
- Complies with RoHS standards
Comfort Features
- Noise Reduction
-
- Vibration-dampening design
- Quiet operation under all conditions
- Ease Of Use
-
- Color-coded connectors
- Tool-free installation
- Longevity
-
- Extended service life (up to 100,000 miles)
- Maintenance-free operation
Accessories
- installation Tools
-
- O2 sensor socket
- Anti-seize compound
- Wire crimping tool
- Replacement Parts
-
- O2 sensor gasket
- Wiring harness adapter
- Heat shield
- Diagnostic Tools
-
- OBD-II scanner
- Multimeter
- Oscilloscope
Maintenance
- Service interval
- Every 60,000 miles or 5 years
- Service Items
-
- Inspect sensor for contamination
- Check wiring for damage
- Test sensor output voltage
- Clean sensor threads
- Replace if faulty
- Maintenance Notes
- Avoid using silicone-based sealants near the sensor.
Warranty
- Standard Warranty
- Miles: 50,000Years: 2Coverage: Defects in materials and workmanship
- Extended Warranty
- Miles: 100,000Years: 5Coverage: Includes sensor replacement
- Pro Rata Warranty
- Miles: 150,000Years: 7Coverage: Partial replacement cost
- Warranty Terms
- Proof of purchase and proper installation required.
Production Details
- Manufacturer
- Denso Corporation
- Manufacturing Process
-
- Precision ceramic molding
- Automated assembly
- Laser welding
- Quality Control
- Testing: Thermal cycling tests, Vibration resistance tests, Electrical performance validationCertifications: ISO 9001, ISO 14001
- Sustainability Practices
-
- Recycling of manufacturing waste
- Energy-efficient production
- Reduced use of hazardous materials
- Production Metrics
- Annual Output: 5 million unitsDefect Rate: Less than 0.1%Lead Time: 2 weeks
Service Information for emissions_sensors Service
Maintenance and service requirements specific to this component
- Inspect sensor wiring for damage
- Check for exhaust leaks near the sensor
- Test sensor output voltage
- Clean sensor threads
- Verify proper ECU communication
Use only OEM-approved cleaning agents.
- Replace sensor if voltage readings are out of range
- Inspect and replace gasket if necessary
- Check for carbon buildup on the sensor
- Test sensor response time
- Verify proper air-fuel ratio feedback
Ensure proper torque during reinstallation.
- Replace sensor as preventive maintenance
- Inspect and replace heat shield if damaged
- Test entire exhaust system for leaks
- Perform ECU recalibration if needed
- Verify compliance with emissions standards
Use a professional-grade OBD-II scanner for diagnostics.
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 Are the emissions sensors compatible with all 2005-2009 Subaru Legacy models?
Are the emissions sensors compatible with all 2005-2009 Subaru Legacy models?
The emissions sensors for the 2005-2009 Subaru Legacy are designed to be compatible with all trim levels, including 2.5i, 2.5 GT, and 3.0R models. These sensors are specifically calibrated for the EJ25 and EZ30 engines. However, it is recommended to verify the part number with your vehicle's VIN to ensure compatibility, as minor variations may exist between model years and regions.
Q2 What maintenance is required for emissions sensors in a 2005-2009 Subaru Legacy?
What maintenance is required for emissions sensors in a 2005-2009 Subaru Legacy?
Emissions sensors in the 2005-2009 Subaru Legacy require minimal maintenance. Regularly inspect the sensors for damage or contamination during routine service intervals. Ensure the wiring harness and connectors are secure and free of corrosion. If the Check Engine Light (CEL) illuminates, use an OBD-II scanner to diagnose potential sensor issues. Replace sensors as needed, typically every 100,000 miles or as indicated by diagnostic trouble codes.
Q3 How do I replace the emissions sensors in a 2005-2009 Subaru Legacy?
How do I replace the emissions sensors in a 2005-2009 Subaru Legacy?
To replace emissions sensors, first, locate the sensor (e.g., oxygen sensor or air-fuel ratio sensor) near the exhaust manifold or catalytic converter. Disconnect the electrical connector and use an appropriate wrench to remove the sensor. Apply anti-seize compound to the threads of the new sensor before installation. Tighten to the manufacturer's torque specification, reconnect the electrical connector, and clear any diagnostic trouble codes using an OBD-II scanner.
Q4 What should I do if the Check Engine Light is on due to an emissions sensor issue?
What should I do if the Check Engine Light is on due to an emissions sensor issue?
If the Check Engine Light is on, use an OBD-II scanner to retrieve the diagnostic trouble code (DTC). Common codes for emissions sensors include P0130 (O2 Sensor Circuit Malfunction) or P0420 (Catalyst System Efficiency Below Threshold). Inspect the sensor wiring for damage, check for exhaust leaks, and test the sensor's voltage output. If the sensor is faulty, replace it and clear the codes. If the issue persists, consult a professional mechanic.
Q5 How can I optimize the performance of emissions sensors in my 2005-2009 Subaru Legacy?
How can I optimize the performance of emissions sensors in my 2005-2009 Subaru Legacy?
To optimize emissions sensor performance, ensure your engine is running efficiently by maintaining proper air-fuel ratios and using high-quality fuel. Regularly replace spark plugs, air filters, and fuel filters. Avoid using aftermarket exhaust components that may interfere with sensor readings. Periodically clean the sensor's exterior to prevent contamination. Properly functioning sensors contribute to better fuel economy and reduced emissions.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
2005-2009 Subaru Legacy Service Manual
Coming SoonComprehensive guide covering maintenance, repair, and diagnostics for the 2005-2009 Subaru Legacy, including emissions system details.
Technical Service Bulletin: Emissions Sensor Updates
Coming SoonSubaru's official bulletin addressing common issues and updates for emissions sensors in 2005-2009 Legacy models.
Subaru Legacy Parts Catalog
Coming SoonDetailed catalog of OEM parts for the 2005-2009 Subaru Legacy, including emissions sensors and related components.
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