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.
2001 Mazda B2500 SE, AutomaticFACTORY OEM SERVICE PROCEDURE
Exhaust Catalyst
- Disable secondary air injection system. Run engine at 2500 RPM for 2 minutes. Turn ignition off. Disconnect and ground one spark plug wire or disconnect one ignition coil for coil on plug applications.
- Start and operate engine at 1000 RPM. Disconnect IAC valve. Using an infrared temperature probe, measure surface temperature at catalytic converter inlet and outlet. Outlet temperature should be at least 50°F (28°C) greater than inlet temperature. Replace catalytic converter, if necessary. Reconnect ignition system, IAC valve and secondary air injection.
Factory Service Tools
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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.