Subaru Subaru Legacy 2015-2019 Emissions & Sensors Specifications
Explore detailed technical specifications for the emissions sensors in the 2015-2019 Subaru Legacy. Learn about sensor types, functions, compatibility, and maintenance tips to optimize your vehicle's emissions system.
Overview Specifications
This document provides detailed specifications and technical information about the emissions sensors used in the 2015-2019 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 are listed under their respective major sections for easy access.
Key Specifications
O2 Sensor Voltage Range
0.1V to 0.9V
Catalytic Converter Temp Limit
950°C
EGR Valve Position Range
0% to 100%
Sensor Operating Temp Range
-40°C to 1000°C
Average Sensor Lifespan
100,000 miles
Available Specifications
Oxygen Sensors
This section covers the oxygen (O2) sensors used in the 2015-2019 Subaru Legacy. These sensors are critical for monitoring the air-fuel ratio and ensuring optimal engine performance and emissions control.
Oxygen Sensors
This section covers the oxygen (O2) sensors used in the 2015-2019 Subaru Legacy. These sensors are critical for monitoring the air-fuel ratio and ensuring optimal engine performance and emissions control.
Front O2 Sensor
- Located before the catalytic converter
- Monitors oxygen levels in exhaust gases
- Provides real-time feedback to the ECU
- Helps adjust fuel injection timing
- Operating temperature range: -40°C to 900°C
- Replacement interval: 100,000 miles
Rear O2 Sensor
- Located after the catalytic converter
- Monitors catalytic converter efficiency
- Ensures emissions compliance
- Signals ECU if catalytic converter fails
- Operating temperature range: -40°C to 800°C
- Replacement interval: 100,000 miles
Catalytic Converter Sensors
This section details 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 details the sensors associated with the catalytic converter, which play a vital role in reducing harmful emissions and ensuring compliance with environmental regulations.
Temperature Sensors
- Monitor catalytic converter temperature
- Prevent overheating and damage
- Provide data for ECU adjustments
- Operating range: -40°C to 1000°C
- Fail-safe mode activates at 950°C
Efficiency Sensors
- Measure catalytic converter performance
- Detect clogging or degradation
- Trigger check engine light if issues arise
- Integrated with O2 sensor data
- Replacement interval: 150,000 miles
Exhaust Gas Recirculation (EGR) Sensors
This section explains the role of EGR sensors in reducing nitrogen oxide (NOx) emissions by recirculating a portion of exhaust gases back into the engine cylinders.
Exhaust Gas Recirculation (EGR) Sensors
This section explains the role of EGR sensors in reducing nitrogen oxide (NOx) emissions by recirculating a portion of exhaust gases back into the engine cylinders.
EGR Valve Position Sensor
- Monitors EGR valve position
- Ensures proper exhaust gas flow
- Signals ECU for adjustments
- Operating voltage: 5V
- Replacement interval: 120,000 miles
EGR Temperature Sensor
- Measures temperature of recirculated gases
- Prevents engine knocking
- Optimizes combustion efficiency
- Operating range: -40°C to 500°C
- Fail-safe mode activates at 450°C
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Component Specifications
Overview
- Type
- Oxygen (O2) and Nitrogen Oxide (NOx) sensors
- Configuration
- Dual-sensor system (upstream and downstream)
- Platform
- Integrated with Subaru Engine Control Unit (ECU)
- Material
- High-temperature ceramic and stainless steel
- Location
- Mounted in exhaust system, pre and post catalytic converter
Dimensions
- Sensor Length
- 3.15 inches (80 mm)
- Sensor Diameter
- 0.98 inches (25 mm)
- Thread Size
- M18 x 1.5
- Cable Length
- 24 inches (610 mm)
- Operating Temperature
- -40°F to 1562°F (-40°C to 850°C)
- Weight
- 0.33 lbs (150 grams)
- Voltage Range
- 0.1V to 0.9V
Materials
- Sensor Body
- Stainless steel with anti-corrosion coating
- Sensing Element
- Zirconium dioxide ceramic
- Heater Element
- Platinum wire
- Cable Sheathing
- High-temperature silicone
Features
- Performance
-
- Real-time exhaust gas analysis
- Wideband oxygen sensing
- Fast response time (less than 100ms)
- Self-diagnostic capability
- Durability
-
- Resistant to vibration and shock
- High-temperature operation
- Corrosion-resistant materials
- Sealed against moisture ingress
- integration
-
- CAN bus communication
- ECU feedback loop
- Onboard diagnostics (OBD-II) compatible
- Automatic calibration
- Environmental
-
- Low power consumption
- Recyclable materials
- Reduced emissions output
- Compliant with EPA and CARB standards
Safety Features
- Electrical
-
- Short-circuit protection
- Overvoltage protection
- Thermal
-
- Overheat shutdown
- Temperature compensation
- Mechanical
-
- Vibration-resistant mounting
- Impact-resistant housing
Comfort Features
- installation
-
- Standardized thread size
- Pre-wired connector
- Tool-free cable routing
- Maintenance
-
- Self-cleaning function
- Easy access location
- Plug-and-play replacement
- Operation
-
- Silent operation
- No moving parts
- Minimal maintenance required
Accessories
- installation
-
- Oxygen sensor socket
- Anti-seize compound
- Wire harness extension
- Testing
-
- OBD-II scanner
- Multimeter
- Sensor simulator
- Replacement
-
- Gasket set
- Heat shield
- Thread chaser
Maintenance
- Service interval
- Every 60,000 miles or 5 years
- Service Items
-
- Inspect sensor wiring
- Check for exhaust leaks
- Verify sensor response time
- Clean sensor threads
- Test heater circuit
- Notes
- Use only Subaru-approved anti-seize compound during installation
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Parts and labor
- Emissions
- Miles: 80,000Years: 8Coverage: Federal emissions components
- Extended
- Miles: 100,000Years: 7Coverage: Sensor replacement only
- Terms
- Warranty void if non-OEM parts used or improper installation
Production Details
- Manufacturer
- Denso Corporation
- Manufacturing Process
-
- Precision ceramic molding
- Automated assembly
- Laser welding
- Quality testing under simulated conditions
- Quality Control
- Testing: Thermal cycling, Vibration resistance, Electrical performanceStandards: ISO 9001 certified, TS 16949 compliant
- Sustainability
-
- Lead-free materials
- Recyclable components
- Energy-efficient production
- Production Metrics
- Units Per Hour: 1200Defect Rate: 0.01%Energy Consumption: 15 kWh per unit
Service Information for emissions_sensors Service
Maintenance and service requirements specific to emissions sensors
- Inspect sensor wiring for damage
- Check for exhaust leaks near sensor
- Verify sensor response using OBD-II scanner
- Clean sensor threads if accessible
Do not use aftermarket cleaning chemicals on sensors
- Test heater circuit resistance
- Check for proper voltage output
- Inspect sensor mounting integrity
- Verify ECU communication
Use only Subaru-approved diagnostic tools
- Replace upstream oxygen sensor
- Test downstream sensor performance
- Inspect and replace gaskets if needed
- Perform full emissions system check
Replacement sensors must be OEM or equivalent quality
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 Are the emissions sensors compatible with all 2015-2019 Subaru Legacy models?
Are the emissions sensors compatible with all 2015-2019 Subaru Legacy models?
The emissions sensors for the 2015-2019 Subaru Legacy are designed to be compatible with all trims and engine configurations, including the 2.5L and 3.6L engines. However, it is recommended to verify the specific part number with your vehicle's VIN to ensure compatibility. These sensors meet OEM specifications and are calibrated for optimal performance with the Legacy's emissions control system.
Q2 What maintenance is required for emissions sensors in a 2015-2019 Subaru Legacy?
What maintenance is required for emissions sensors in a 2015-2019 Subaru Legacy?
Emissions sensors in the 2015-2019 Subaru Legacy require minimal maintenance. Regularly inspect the sensors during routine service intervals (every 30,000 miles) for signs of damage or contamination. Ensure the electrical connections are secure and free of corrosion. If the Check Engine Light illuminates, have the sensors diagnosed promptly to avoid potential emissions system issues.
Q3 How do I replace the emissions sensors in a 2015-2019 Subaru Legacy?
How do I replace the emissions sensors in a 2015-2019 Subaru Legacy?
To replace emissions sensors, first, locate the sensor (typically near the exhaust manifold or catalytic converter). Disconnect the electrical connector and use an appropriate wrench to remove the sensor. Install the new sensor by threading it in by hand to avoid cross-threading, then tighten to the specified torque (usually 30-40 Nm). Reconnect the electrical connector and clear any diagnostic trouble codes using an OBD-II scanner.
Q4 What should I do if the emissions sensor triggers a Check Engine Light?
What should I do if the emissions sensor triggers a Check Engine Light?
If the Check Engine Light is triggered, use an OBD-II scanner to retrieve the diagnostic trouble code (DTC). Common codes for emissions sensors include P0420 (Catalyst Efficiency) or P0135 (O2 Sensor Heater Circuit). Inspect the sensor for damage, contamination, or loose connections. If the sensor is faulty, replace it. If the issue persists, check the exhaust system for leaks or other malfunctions.
Q5 How can I optimize the performance of emissions sensors in my Subaru Legacy?
How can I optimize the performance of emissions sensors in my Subaru Legacy?
To optimize emissions sensor performance, ensure your vehicle's engine is running efficiently by maintaining proper air-fuel ratios and using high-quality fuel. Regularly replace spark plugs and air filters. Avoid short trips that prevent the sensors from reaching optimal operating temperatures. Periodically clean the sensor's exterior to prevent contamination from road debris or oil buildup.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
2015-2019 Subaru Legacy Service Manual
Coming SoonComprehensive guide covering maintenance, repair, and diagnostics for the 2015-2019 Subaru Legacy, including emissions system details.
Subaru Technical Service Bulletin: Emissions Sensor Updates
Coming SoonLatest updates and fixes for emissions sensors in 2015-2019 Subaru Legacy models, including diagnostic procedures and part revisions.
Subaru Legacy Parts and Accessories Catalog
Coming SoonDetailed catalog of OEM and aftermarket parts for the 2015-2019 Subaru Legacy, including emissions sensors and related components.
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