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2008 Lexus IS 250 - Locked then died

my steering wheel start locking up then a day later my car died.

The electric steering will shut down if the system voltage is low, your alternator failed.

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Something similar happened both times the alternator failed on my Corolla. The steering became stiff just before the car died completely.

The standard battery/alternator diy’er test: Before first start of the day battery should measure about 12.6 volts. Immediately after starting the engine, 13.5-15.5 volts.