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.
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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONOBD-II DRIVE CYCLESDRIVE CYCLES2007: MAZDA5HO2S HEATER, HO2S, AND TWC REPAIR VERIFICATION DRIVE MODE
1999 Mazda 626 ES, 2.5 D, Standard
HO2S heater, HO2S, and TWC Repair Verification Drive Mode
1999 Mazda 626 ES, 2.5 D, StandardSECTION HO2S heater, HO2S, and TWC Repair Verification Drive Mode
- Perform "PCM Adaptive Memory Production Drive Mode" first.
- Verify all accessory loads (A/C, headlights, blower fan, rear window defroster) are off.
- Drive the vehicle as shown in the graph. The driving conditions before driving at constant speed are not specified.
- Stop the vehicle and access ON BOARD SYSTEM READINESS menu of GENERIC OBD-II FUNCTION to verify the OBD monitoring status.
- If completed, the OBD monitoring status items change from non-completed to completed.
- If not completed, turn the ignition switch off then repeat from Step 3.
- Access DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD-II FUNCTIONS to verify the monitor results.
- If detected values are not within the specification, repair has not been completed.
- Verify no DTCs are available.
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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.