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.
1990 Mazda 929 BaseFACTORY OEM SERVICE PROCEDURE
Trouble Code Identification Table (DOHC)
TROUBLE CODE IDENTIFICATION
| DTC | Description |
|---|---|
| CODE 1 | DOHC Ignition Pulse |
| CODE 2 | DOHC NE Signal-Distributor |
| CODE 3 | DOHC G1 Signal-Distributor |
| CODE 4 | DOHC G2 Signal-Distributor |
| CODE 5 | DOHC Knock Sensor And Knock Control Unit |
| CODE 8 | DOHC Airflow Meter |
| CODE 10 | DOHC Intake Air Thermosensor-Airflow Meter |
| CODE 11 | DOHC Intake Air Thermosensor-Dynamic Chamber |
| CODE 12 | DOHC Throttle Sensor |
| CODE 14 | DOHC Atmospheric Pressure |
| CODE 15 | DOHC Left Side Oxygen Sensor |
| CODE 16 | DOHC EGR Position Sensor |
| CODE 17 | DOHC Left Side Feedback System |
| CODE 23 | DOHC Right Side Oxygen SensoR |
| CODE 24 | DOHC Right Side Feedback System |
| CODE 25 | DOHC Pressure Regulator Control Solenoid Valve |
| CODE 26 | DOHC Purge Control Solenoid Valve |
| CODE 28 | DOHC EGR Vacuum Solenoid Valve |
| CODE 29 | DOHC EGR Vent Solenoid Valve |
| CODE 34 | DOHC Idle Speed Control (ISC) |
| CODE 36 | DOHC Oxygen Sensor Heater Relay |
| CODE 41 | DOHC Variable Resonance Induction System |
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.
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