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.
1994 Mazda Protege BaseFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Trouble Code Identification
- Notes
- Trouble Code Identification Table
- Code 03: (SGC Signal - Distributor)
- Code 04: (SGT Signal - Distributor)
- Code 08: (Airflow Meter)
- Code 09: (Coolant THERMOSENSOR)
- Code 10: (Intake Air THERMOSENSOR)
- Code 12: (Throttle Sensor)
- Code 14: (Atmospheric Pressure Sensor)
- Code 15: (Oxygen Sensor)
- Code 16: (EGR Function Sensor)
- Code 17: (Oxygen Sensor - Inaccurate)
- Code 25: (Pressure Regulator Solenoid Valve)
- Code 26: (Purge Control Solenoid Valve)
- Code 28: (EGR Vacuum Valve Solenoid)
- Code 29: Diagnostic Chart (EGR Vent Valve Solenoid)
- Code 34: (Idle Speed Control)
- Code 35: (Pressure Regulator Solenoid Valve No. 2)
- Code 41: (Variable Inertia Charging System - DOHC)
- Summary
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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