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Is the cars' computer actually able to test the components within the car?

Eg. I have a Spark Plugs warning (Yellow triangle - 500mls). Is this indicator based on the actual condition of the spark plugs or is it a purely time based method - ie the plugs have not been replaced for 5 years so the emu indicates they need replacing regardless of their condition? Are all the servicing diganostics just based on time?
 

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Some component service intervals are based on the style of driving you do. Others like coolant or brake fluid is time based.
 

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The cars computer can't test the spark plugs or the brake fluid, as mentioned by Neal it's dependent on conditions
 
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