* Power Steering Pump: A failing power steering pump can struggle to provide sufficient pressure, especially under load (like when turning the wheel). If the pump fails completely, the engine might stall. Listen for unusual noises (whining, groaning) from the power steering pump while the engine is running.
* Power Steering Belt: A worn, loose, or broken power steering belt prevents the pump from functioning. Check the belt for cracks, fraying, or slippage.
* Low Power Steering Fluid: Insufficient fluid will cause the pump to work harder and overheat, potentially leading to stalling. Check the power steering fluid level and condition. Low fluid can indicate a leak somewhere in the system.
* Alternator: While not directly related to the power steering, a failing alternator can't charge the battery adequately. If the battery voltage drops too low while the power steering pump is under heavy load (turning the wheel), the engine may stall. Have the alternator tested.
* Battery: A weak or failing battery can't supply enough power to handle the demands of the power steering pump and other systems simultaneously. This is especially likely if the engine is already struggling. Have the battery tested.
* Wiring/Electrical Connection: A short circuit or faulty connection in the power steering system's wiring could cause the engine to cut out. This is less likely but should be considered if other potential causes are ruled out.
* Sensor Issues: Although less common, a faulty sensor (like a crankshaft position sensor or camshaft position sensor) could cause the engine to stall under load.
Troubleshooting Steps:
1. Check Power Steering Fluid: This is the easiest and quickest check. If it's low or dirty, address that first. A leak needs to be found and repaired.
2. Inspect Power Steering Belt: Check for wear, cracks, and proper tension.
3. Listen for Power Steering Pump Noises: Unusual noises indicate a failing pump.
4. Have the Alternator and Battery Tested: A simple test at an auto parts store will quickly reveal their condition.
If the problem persists after checking these items, a more thorough diagnostic check by a qualified mechanic is necessary. They have specialized tools and expertise to diagnose more complex electrical or mechanical issues. Don't continue driving the car with this problem, as it could lead to a dangerous situation.
