There could be several reasons why your car engine stalls or turns off when you're turning a corner. Here are some possible causes:

Fuel Supply Issues:

A low fuel level or a malfunctioning fuel pump can cause the engine to lose power while turning, as the fuel is unable to reach the engine properly due to the car's angle.

Idle Control Problems:
The idle air control valve (IAC) regulates the engine's idle speed. If it’s faulty or dirty, the engine might stall, especially when there’s a sudden change in engine load, like turning.

Vacuum Leaks:
A vacuum leak in the intake system can cause an imbalance in air-to-fuel ratio, leading to stalling, particularly when the vehicle is under load (such as while turning).

Faulty Alternator or Battery:
A weak or failing alternator might not provide enough power to the engine and electrical components while turning, causing the engine to shut off. Similarly, a bad battery can cause stalling if it's unable to supply the necessary voltage.

Transmission Issues:
If the transmission has issues, such as slipping or failing to engage properly, it could cause the engine to stall during turns when additional stress is applied.

Ignition System Malfunction:
Problems with the ignition system, like a faulty ignition coil or spark plugs, can cause misfires or stalling when the car is in motion, including when turning.

Power Steering Load:
If your power steering system is malfunctioning or if there's a belt issue, the additional load on the engine when turning can cause it to stall, especially if the idle speed is too low.

Sensor Malfunctions:
Faulty sensors, such as the mass airflow sensor (MAF) or throttle position sensor (TPS), can cause the engine to receive incorrect readings, leading to stalling during turns.

Fuel Contamination:
Contaminated or poor-quality fuel might cause engine performance issues, including stalling, particularly during changes in vehicle movement, such as turning.

Excessive Engine Load:
If the engine is under heavy load, such as carrying a lot of weight or struggling to maintain speed, it might stall while turning due to increased power demands.

Checking your vehicle by a mechanic will help identify the exact cause and prevent further engine problems.