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Q: why would my breaks pulsate and my check engine light come on. on 2003 Mazda Mazda6

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the pulsation occurs when applying brakes to stop and the check engine light is on or it blinks on and off.
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Sounds like 2 differant problems...pulsating when applying brakes typicaly means you have warped brake rotor disc and a flashing check engine light typicaly means the computer is detecting a miss fire in engine...that could damage catalytic converter if it not repaired.
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