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 MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE CONTROL SYSTEM [L3]AIR FUEL RATIO (A/F) SENSOR INSPECTIONA/F SENSOR CURRENT INSPECTION
2010 Mazda 5 Sport, 2.3 L, Standard
A/F Sensor Current Inspection
2010 Mazda 5 Sport, 2.3 L, StandardSECTION A/F Sensor Current Inspection
- Warm up the engine to normal operating temperature.
- Using the M-MDS, monitor the following:
- Vehicle speed (PID: VSS)
- Engine speed (PID: RPM)
- A/F sensor current (PID: O2S11)
- Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more.
- Verify that the A/F sensor current (PID: O2S11) is 0.25 mA or more while decelerating as shown in the illustration.
- If not within the specification, inspect the A/F sensor for an open or short circuit. (See A/F SENSOR CIRCUIT OPEN/SHORT INSPECTION .) Then if there is no malfunction in the wiring harness, replace the A/F 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.