Audi SQ5 P0402: EGR Flow Too High

Hello everyone,

I'm currently working on an SQ5 that's showing an error code indicating that the EGR (Exhaust Gas Recirculation) flow rate is too high. This error usually occurs during high-load driving, which then puts the vehicle into limp mode.
According to the freeze-frame data, the error occurs during thrust operation.

Model: SQ5.
Year of construction: 2013.
MKB: CGQB
Mileage: 189,401 km

I performed a logging run until the system entered limp mode, and I have graphically represented the SETPOINT/ACTUAL values of boost pressure, air mass, and EGR valve in the attached document. The blue graph shows the SETPOINT value, and the orange graph shows the ACTUAL value.

Are the cause of the error visible based on these measurements?

Thank you in advance!

Hi,

It would have been great to have Autoscan and a log with load, air mass target/actual values (instead of just images).

If the EGR valve is stuck open, it may not close properly. Alternatively, there might be an air leak somewhere after the mass airflow sensor (MAF), such as in the intake manifold or the charge air cooler, causing unmeasured air to be drawn in.

Best regards, Rainer.