TwinTurbo.NET: Nissan 300ZX forum - You don't understand the purpose of that lamp
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Subject You don't understand the purpose of that lamp
     
Posted by spicyZ on June 01, 2015 at 10:48 AM
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In Reply To check engine what posted by diamond20601 on May 31, 2015 at 10:37 PM
     
Message It only comes on for electrical issues, not mechanical, so your example of timing belt breaks not turning it on is non-sensical.

In general, the check engine light is not a critical problem (as you imply above), and in modern cars it's an indicator that the emissions equipment is malfunctioning.

In our cars, it's an indictor that an electronic component is failing - this is rarely catastrophic (PTU failure at highway speed being an example exception), though it can prevent the car from starting / running.

For a full list of when the CEL is triggered, see this in the FAQ.
ECU Primer


-jb

     
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