Acura TSX 2009-2014 Emissions & Sensor Bolt Torque Specifications
This page provides detailed torque specifications for bolts related to emissions sensors on the 2009-2014 Acura TSX, including oxygen sensors, air fuel ratio sensors, and related components.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
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.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
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.
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.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
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
3.0l-engine Cylinder Head
Torque specifications for the cylinder head and related components.
1 Exhaust Manifold to Cylinder Head Bolts
M8 x 1.25
Exhaust Manifold to Cylinder Head Bolts
M8 x 1.25Torque Value
Important Notes
3.0l-intake Manifold
Torque specifications for the intake manifold and related components.
1 Mass Air Flow (MAF) Sensor Mounting Bolts
M5 x 0.8
Mass Air Flow (MAF) Sensor Mounting Bolts
M5 x 0.8Torque Value
Important Notes
2 Intake Air Temperature (IAT) Sensor Mounting Screw
M6 x 1.0
Intake Air Temperature (IAT) Sensor Mounting Screw
M6 x 1.0Torque Value
Important Notes
3 EGR Valve Mounting Bolts
M8 x 1.25
EGR Valve Mounting Bolts
M8 x 1.25Torque Value
Important Notes
3.0l-exhaust System
Torque specifications for exhaust components.
1 Exhaust Manifold/Header Bolts
M10 x 1.5
Exhaust Manifold/Header Bolts
M10 x 1.5Torque Value
Important Notes
2 Exhaust Pipe to Exhaust Manifold/Header Bolts
M10 x 1.5
Exhaust Pipe to Exhaust Manifold/Header Bolts
M10 x 1.5Torque Value
Important Notes
3 Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5
Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5Torque Value
Important Notes
4 Primary Oxygen Sensor
M18 x 1.5
Primary Oxygen Sensor
M18 x 1.5Torque Value
Important Notes
5 Secondary Oxygen Sensor
M18 x 1.5
Secondary Oxygen Sensor
M18 x 1.5Torque Value
Important Notes
3.0l-evaporative Emissions
Torque specifications for the evaporative emissions system.
1 Evaporative Emission (EVAP) Canister Mounting Bolts/Straps
M6 x 1.0
Evaporative Emission (EVAP) Canister Mounting Bolts/Straps
M6 x 1.0Torque Value
Important Notes
2 EVAP Purge Control Solenoid Valve Bolts
M6 x 1.0
EVAP Purge Control Solenoid Valve Bolts
M6 x 1.0Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
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
Diagnostic Steps
Visual inspection, torque verification, thread assessment
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
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
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
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 Why is it important to use the correct torque specification for emissions sensor bolts?
Why is it important to use the correct torque specification for emissions sensor bolts?
Using the correct torque is critical for ensuring a proper seal and preventing damage to both the sensor and the mounting point. Over-tightening can crack the sensor housing, strip threads, or cause the sensor to function improperly, while under-tightening can lead to leaks, vibrations, and inaccurate readings. For example, an under-torqued oxygen sensor could allow exhaust leaks and cause the check engine light to illuminate.
Q2 What happens if I don't have a torque wrench?
What happens if I don't have a torque wrench?
While using a torque wrench is highly recommended, if you don't have one, you must be extremely cautious. Avoid over-tightening. Tighten the bolt until snug, and then give it a small additional turn - about 1/8 of a turn. It's much safer to under-torque and re-check with a torque wrench later than to overtighten and damage the sensor. Consider borrowing or renting a torque wrench before proceeding. If you've overtightened, inspect the sensor carefully for any cracks or damage.
Q3 Can I reuse the sensor mounting bolts?
Can I reuse the sensor mounting bolts?
It is generally recommended to replace mounting bolts, especially if they show signs of rust, damage or if the torque specification is low. However, for sensors like oxygen sensors which can be costly, if the bolts are in good condition they can be reused with caution. Ensure the threads are clean and undamaged. Always use anti-seize compound to prevent them from seizing during future removals. For other sensors, refer to the service manual.
Q4 Should I apply any type of lubricant or anti-seize to the bolts?
Should I apply any type of lubricant or anti-seize to the bolts?
Yes, applying a small amount of anti-seize compound to the threads of the sensor mounting bolts is highly recommended. This prevents the bolts from seizing over time due to heat and exposure to the elements, making future removals much easier. Apply a thin coating - do not over apply. Do not apply grease, as this could cause issues during tightening and create an incorrect torque.
Q5 How often should I inspect the emissions sensors?
How often should I inspect the emissions sensors?
While emissions sensors usually don't require regular maintenance, it's good practice to visually inspect them when you're performing other routine maintenance, like changing your engine oil. Look for any signs of damage, loose connections, or corrosion. A malfunctioning sensor will usually trigger a check engine light. If you suspect a problem, have the sensor checked and replaced by a qualified mechanic.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
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
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
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 calibrated torque wrench is essential for tightening bolts to the correct specifications to prevent leaks and damage.
- Click-type or digital torque wrench
- Appropriate torque range for emissions sensor bolts (typically 8-16 ft-lbs)
Socket Set
A socket set with the correct sizes for the emissions sensor bolts.
- Metric socket sizes (typically 10mm, 12mm)
- 3/8" or 1/4" drive depending on socket size
Extension bars
Extension bars to reach sensors in difficult locations.
- Various lengths available
- 1/4", 3/8" drive sizes
Service Procedures
Oxygen Sensor Removal and Installation
Procedure for removing and installing oxygen sensors, ensuring proper torque specifications are met.
- Disconnect the negative battery terminal.
- Locate the oxygen sensor(s) to be replaced. This vehicle may have multiple oxygen sensors.
- Disconnect the electrical connector(s) from the sensor(s).
- Use the correct size wrench or socket to remove the sensor(s).
- Apply anti-seize compound to the threads of the new sensor(s).
- Hand-tighten the new sensor(s) into the exhaust pipe.
- Using the torque wrench, tighten the sensor(s) to the manufacturer's recommended torque specification (typically 25-35 Nm or 18-26 ft-lbs. Verify specific torque spec).
- Reconnect the electrical connector(s).
- Reconnect the negative battery terminal.
- Start the vehicle and verify no leaks are present from the oxygen sensor mounting area.
A/F Sensor Removal and Installation
Procedure for removing and installing Air Fuel Ratio sensors, ensuring proper torque specifications are met.
- Disconnect the negative battery terminal.
- Locate the A/F sensor(s) to be replaced.
- Disconnect the electrical connector(s) from the sensor(s).
- Use the correct size wrench or socket to remove the sensor(s).
- Apply anti-seize compound to the threads of the new sensor(s).
- Hand-tighten the new sensor(s) into the exhaust pipe.
- Using the torque wrench, tighten the sensor(s) to the manufacturer's recommended torque specification (typically 25-35 Nm or 18-26 ft-lbs. Verify specific torque spec).
- Reconnect the electrical connector(s).
- Reconnect the negative battery terminal.
- Start the vehicle and verify no leaks are present from the A/F sensor mounting area.
EVAP Purge Valve Removal and Installation
Procedure for removing and installing the EVAP purge valve, ensuring proper torque specifications for mounting bolts are met.
- Disconnect the negative battery terminal.
- Locate the EVAP purge valve.
- Disconnect the electrical connector and any vacuum lines from the valve.
- Remove any mounting bolts securing the valve. (Note torque spec of 8-12 N*m or 71-106 in-lbs for the bracket bolts)
- Install the new valve and bracket using new hardware.
- Torque the mounting bolts to the manufacturer's recommended specification.
- Reconnect vacuum lines and electrical connector.
- Reconnect the negative battery terminal.
- Start the vehicle to verify proper function.
Technical Service Bulletins
Oxygen Sensor Bolt Corrosion Issues
2012-05-15Some 2009-2014 Acura TSX models have experienced corrosion on the threads of the oxygen sensor bolts, which can lead to difficulty removing the sensors and inaccurate torque readings. Always check threads.
Resolution: Apply anti-seize compound liberally to the sensor threads. Use a wire brush to clean all mounting surfaces before reinstallation.
A/F Sensor Bolt Shearing
2011-12-01Reports of shearing of Air Fuel Ratio sensor bolts due to excessive torque during installation. Use a calibrated torque wrench.
Resolution: Use a calibrated torque wrench set to 18-26 ft-lbs and use smooth even pressure when tightening. Replace all sheared bolts.
EVAP Purge Valve Bracket Bolt Torque Spec Clarification
2013-08-22Clarification on torque specifications for EVAP Purge Valve Bracket bolts. The mounting bolts torque should be set to 8-12 N*m or 71-106 in-lbs.
Resolution: Ensure bolts are torqued to the correct specification as noted in this bulletin to prevent damage to the bracket or threads.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.