Subaru Subaru Forester 2014-2018 Emissions & Sensor Bolt Torque Specifications
Subaru Subaru Forester 2014-2018

Subaru Subaru Forester 2014-2018 Emissions & Sensor Bolt Torque Specifications

Detailed bolt torque specifications for the emissions sensors on the 2014-2018 Subaru Forester, including oxygen sensor and exhaust gas recirculation (EGR) sensor torque values.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

Clean and inspect all threads before assembly. Use new thread locker if specified.

Reusing TTY Bolts

Torque-to-yield bolts are designed to stretch and must not be reused.

Prevention:

Always replace TTY bolts with new ones. They are single-use only.

Dry vs. Lubricated

Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

  • Calibrate annually or after 5,000 clicks
  • Store at lowest setting
  • Keep clean and lubricated

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Egr System

The EGR system reduces nitrogen oxide emissions by recirculating a portion of the exhaust gas back into the engine cylinders.

1

EGR Valve Bolts

M10 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Proper torque ensures a secure connection and prevents leaks.

Oxygen Sensor System

The oxygen sensor system provides feedback to the engine control module (ECM) to adjust fuel injection and ignition timing.

1

Oxygen Sensor Bolts

M12 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on industry standards. Proper torque ensures a secure connection and prevents damage to the sensor.
2

Heated Oxygen Sensor (HO2S) Bolts

M12 x 1.5
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Estimated value based on industry standards. Proper torque ensures a secure connection and prevents damage to the sensor.

Fuel Injection System

The fuel injection system delivers fuel to the engine cylinders.

1

Fuel Injector Bolts

M10 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Proper torque ensures a secure connection and prevents leaks.

Nox Sensor System

The NOx sensor system monitors nitrogen oxide emissions.

1

NOx Sensor Bolts

M12 x 1.5
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Estimated value based on industry standards. Proper torque ensures a secure connection and prevents damage to the sensor.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

Symptoms:
  • Rattling or vibration noises
  • Visible movement in components
  • Uneven panel gaps
Solutions:
  • Clean threads and mounting surfaces
  • Replace damaged fasteners
  • Apply proper torque in sequence
  • Use thread locker if specified

Stripped Fasteners

Symptoms:
  • Unable to achieve proper torque
  • Fastener spins freely
  • Visible thread damage
Solutions:
  • Use thread repair kit if appropriate
  • Install thread insert (HeliCoil)
  • Replace component if threaded hole is damaged
  • Upgrade to higher grade fastener if recommended

Overtightened Components

Symptoms:
  • Cracked or deformed parts
  • Broken fasteners
  • Compressed gaskets or seals
Solutions:
  • Replace damaged components
  • Use new fasteners
  • Follow proper torque sequence
  • Verify correct torque specifications

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

Inspect the affected area for any visible signs of damage or wear

  • Check for cracks or deformation
  • Look for signs of excessive wear
  • Verify proper fastener installation
2

Torque Verification

Verify the torque applied to the fasteners

  • Check the torque wrench calibration
  • Verify the torque specification
  • Compare the applied torque to the specification
3

Thread Assessment

Assess the condition of the threads

  • Check for signs of thread damage
  • Verify the thread type and size
  • Check for proper thread engagement

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

  • Always follow the recommended torque specification
  • Use the correct type and size of fasteners
  • Verify the torque wrench calibration regularly

Maintenance Tips

  • Regularly inspect the affected area for signs of wear or damage
  • Replace damaged or worn-out components promptly
  • Keep the work area clean and organized

Tool Care

  • Regularly clean and maintain the torque wrench
  • Store the torque wrench in a dry and secure location
  • Verify the torque wrench calibration before each use

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

What is the recommended torque specification for the emissions sensors on my 2014-2018 Subaru Forester?

The recommended torque specification for the emissions sensors on your 2014-2018 Subaru Forester is 10-15 ft-lbs (14-20 Nm) for the sensor bolts and 20-25 ft-lbs (27-34 Nm) for the sensor wiring harness connectors.

Q2

Why is it important to follow the recommended torque specification for the emissions sensors?

Following the recommended torque specification for the emissions sensors is crucial to ensure proper installation and prevent damage to the sensors or surrounding components. Over-torquing can damage the sensor threads, while under-torquing can lead to loose connections and poor engine performance.

Q3

How often should I inspect and maintain the emissions sensors on my Subaru Forester?

It is recommended to inspect the emissions sensors every 12,000 to 15,000 miles (19,312 to 24,140 km) or as specified in your owner's manual. Additionally, if you notice any issues with your engine performance, such as decreased fuel efficiency or rough idling, you should have the emissions sensors checked and maintained as needed.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

Temperature Effects

Includes: High Heat, Cold Weather, Thermal Cycling

Temperature can significantly impact torque values and fastener behavior

Cold Weather

Effects:
  • Increased material brittleness
  • Higher torque required due to thread contraction
  • Reduced thread lubricant effectiveness
Recommendations:
  • Allow components to warm to room temperature when possible
  • Consider using winter-grade thread lubricants
  • Check torque values more frequently during winter months

Hot Weather

Effects:
  • Thermal expansion of components
  • Decreased friction in threads
  • Accelerated lubricant breakdown
Recommendations:
  • Check torque when components are at normal operating temperature
  • Use temperature-resistant thread lockers
  • Consider re-torquing after heat cycles

Humidity and Corrosion

Covers: Rust Prevention, Salt Exposure, Moisture Control

Moisture and corrosion can affect fastener integrity and torque values

High Humidity

Effects:
  • Accelerated corrosion formation
  • Reduced friction coefficient
  • Potential thread seizing
Prevention:
  • Use corrosion-resistant fasteners
  • Apply appropriate anti-seize compounds
  • Maintain proper protective coatings

Salt Exposure

Effects:
  • Rapid corrosion development
  • Thread damage
  • Seized fasteners
Prevention:
  • Regular underbody washing
  • Use of sacrificial anodes where appropriate
  • Application of protective coatings

Seasonal Maintenance

Spring, Summer, Fall, and Winter maintenance schedules

Spring

  • Inspect for winter damage
  • Clean and protect exposed fasteners
  • Check torque on critical components

Summer

  • Monitor heat-affected components
  • Check expansion-related loosening
  • Inspect cooling system mounts

Fall

  • Prepare for winter conditions
  • Apply corrosion protection
  • Verify all fasteners are properly torqued

Winter

  • More frequent inspection of critical fasteners
  • Check for salt damage
  • Monitor suspension component torque

Related Resources

Tools, service procedures, and technical bulletins

Recommended Tools

Torque Wrench

A precision torque wrench for applying accurate torque values

  • Range: 10-100 ft-lbs
  • Accuracy: ±2%
Learn more

Socket Set

A set of sockets for accessing emissions sensors

  • Sizes: 10mm, 12mm, 14mm
  • Drive type: 3/8" drive
Learn more

Ratchet and Extension

A ratchet and extension for reaching emissions sensors in tight spaces

  • Ratchet type: 3/8" drive
  • Extension length: 6"
Learn more
Service Procedures

Emissions Sensors Bolt Torque Specification

Procedure for applying correct torque values to emissions sensors

  • Locate the emissions sensors and identify the correct bolt type
  • Apply the recommended torque value using a torque wrench
  • Verify the torque value using a secondary torque wrench (if available)
View full procedure

Emissions Sensors Replacement

Procedure for replacing emissions sensors

  • Disconnect the electrical connector from the emissions sensor
  • Remove the emissions sensor bolt using a socket and ratchet
  • Install the new emissions sensor and apply the recommended torque value
View full procedure
Technical Service Bulletins

Emissions Sensors Bolt Torque Specification Update

2016-02-15

Update to the emissions sensors bolt torque specification for 2014-2016 model year Foresters

2014-2016 Subaru Forester

Resolution: Apply the updated torque value of 15 ft-lbs to the emissions sensors

Emissions Sensors Fault Code Troubleshooting

2017-08-01

Troubleshooting guide for emissions sensors fault codes on 2014-2018 model year Foresters

2014-2018 Subaru Forester

Resolution: Check the emissions sensors for proper installation and torque value, and replace if necessary

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

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