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.
1986 Mazda 626 BaseFACTORY OEM SERVICE PROCEDURE
Test Equipment & Hook-Up
- Use Digital Code Tester (49 B018 9A0 ) to trouble shoot and detect fault(s) in sensors, wiring, or connections. Tester may also be used to locate short circuits between each sensor/control circuit. A fault is indicated by a code number and buzzer.
- A Green light on tester indicates operation of oxygen sensor. A lean air/fuel mixture is indicated when light is off. A rich air/fuel mixture is indicated when light is on. Some tests require the use of a volt/ohmmeter.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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