The situation.
A car that unlocks but will not start, a rejected key, a steering-lock warning and a no-start after module replacement are different diagnostic starting points. The immobilizer is one possible cause; vehicle power, wiring, mechanical faults and other electronics can produce similar symptoms.
The approach to your vehicle.
We begin with what works, what changed and which keys are affected. Vehicle-specific assessment helps distinguish key replacement from ignition or steering-lock work, module configuration and an unrelated automotive repair. We explain the findings and proposed next step before programming or replacing parts.
Questions about immobilizer & start diagnostics.
Can you diagnose from a dashboard warning alone?
A warning is useful information, but it does not establish a failed component. The system and symptoms need assessment.
Is this an immobilizer bypass service?
This is diagnosis and supported repair for an authorized owner or representative. The proposed work is to restore the appropriate key and vehicle functions.
Should I order a key before diagnosis?
If the cause is unclear, describe the symptoms first. A new key will not fix an unrelated lock, module or power-supply fault.