If your Lexus LS dies right after a cold start, especially in winter, it’s usually a fuel, air, or sensor issue. Here’s what to check first and whether you can drive it.
Why cold starts are so revealing
When your Lexus LS fires up on a frosty morning, the engine control module (ECM) goes into a special cold-start enrichment mode. It richens the fuel mixture, raises idle speed, and relies heavily on sensors like the coolant temperature (ECT), intake air temperature (IAT), and mass airflow (MAF) sensors. If any of those readings are off, the engine can flood, lean out, or simply lose its idle. That is why a problem that is invisible on a warm day can stall the car within seconds of a winter cold start.
