Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2004 Mazda RX-8 1.3 3FACTORY OEM SERVICE PROCEDURE

Front Heated Oxygen Sensor (Ho2S) Removal/Installation

For the AT vehicles, perform the following procedure for easier access.
1. Remove the rubber hanger.
2. Remove the rear tunnel member.
3. Remove the front tunnel member.
4. Remove the catalytic converter installation nuts.
5. Remove the ATF level gauge pipe. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION .)
Fig 1: Exploded View Of Exhaust With Torque Specifications
Courtesy of MAZDA MOTORS CORP.
Remove the front HO2S using the SST (49 T018 001).
Install in the reverse order of removal.
Front HO2S tightening torque
1. 29-49 N.m {3.0-4.9 kgf.m, 22-36 ft.lbf}
Fig 2: Removing Front HO2S
Courtesy of MAZDA MOTORS CORP.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready Tools Compare Repair Quote Quote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty

Get a Free Quote

No obligation. See pricing before you book.