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.
1983 Mazda 626 Base, 4D HatchbackFACTORY OEM SERVICE PROCEDURE
EGR Valve Position Sensor
- The EGR position sensor monitors EGR valve position for the control unit. It is mounted on the EGR valve.
- Unplug the sensor electrical connector. Using an ohmmeter, check the continuity of the sensor. Insert probes of ohmmeter in terminals with Blue/Orange and Light Green/Yellow wires.
- If the ohmmeter reads some resistance, the position sensor is not defective.
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.