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 MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 47 (ENGINE CONTROLS - SELF-DIAGNOSTICS)SYSTEM TESTSDIFFERENTIAL PRESSURE FEEDBACK EGR SENSOR
2008 Mazda 6 s Sport, 4D Hatchback, Standard
Differential Pressure Feedback EGR Sensor
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Differential Pressure Feedback EGR Sensor
WARNING: This page is about a different car, the 2002 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
- Check DPFEGR Output
Connect scan tool to DLC. Warm up engine and run at idle. Access DPFEGR PID and record value for the following:- Hot idle specification (0.2-1.3 V).
- Driving 30 MPH specification (0.2-1.3 V).
- Driving 55 MPH specification (0.2-4.5 V).
If DPFEGR PID values are as specified, DPFEGR sensor is okay. If DPFEGR PID values are not as specified, go to next step.
- Check DPFEGR Sensor Output By Applying Vacuum With Hand Pump
Turn ignition on, engine off. Access DPFEGR PID on scan tool. Disconnect upstream and downstream hoses from DPFEGR sensor. Connect a hand vacuum pump to intake manifold side (downstream side = smaller diameter) of DPFEGR sensor. Apply vacuum and check DPFEGR PID. DPFEGR PID voltage reading must be 0.2-1.3 volts with ignition on and no vacuum applied. DPFEGR PID voltage reading must increase to more than 4.0 volts with vacuum applied. DPFEGR PID must drop to less than 1.5 volts in less than 3 seconds when vacuum is released. If DPFEGR PID voltage reading is as specified, DPFEGR sensor is okay. If DPFEGR PID voltage reading is not as specified, replace DPFEGR sensor.
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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.