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.
Circuit Description
The Mass Airflow (MAF) sensor measures the amount of air entering the engine during a given time. PCM uses MAF sensor information to monitor EGR flow rates. A large quantity of air entering the engine indicates acceleration, high load situation or no EGR flow, while a small quantity of air entering the engine indicates deceleration, idle or full EGR operation. PCM uses MAF sensor and EGR control pressure/BARO sensor to determine an intake leak.
DTC will set when the following conditions are present:
- BARO reading at greater than or equal to 75 kPa.
- DTCs P0405, P0406, P0102 and P0103 are not set.
- All EGR tests have been completed (internal to PCM).
- Intake leak greater than calibrated value (internal to PCM).
- Conditions are met for 2 seconds.
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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.