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We would need a little more info, to be able to try to help you.

What year truck?
Have you had the codes pulled?

42,000 is very low mileage for C or K truck. What model truck is this?

If you go to a local Autozone, PartsAmerica/Advance, VIP Auto... they will be able to help you pull the codes.

Could be something as simple as an O2 sensor. Any issues with the engine, transmission lately?
 

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'Check Engine' light and 'Service Engine Soon' light are the same thing. It is not a maintanance thing. The computer is sensing that there is something wrong. You need to get an OBD (On-Board Diagnostic) scanner to see what the problem is. For 96 and UP it is OBDII for 95 and lower it's OBDI.
 

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Discussion Starter #4 (Edited)
hey thanks guys i'm in the wrong part of this site ....it's a '04 colly crew I-5 auto 4x4 the code is p0506 auto zone pulled it and gave me a read out it was about the idle was too low.checked the maf and cleaned it,was told the air filter oil could be a problem. i'm only getting 16 to16.9 mpg. my mods are stock k&n,magnaflow side exaust,mobil 1 oil and a bed cover. thanks doug
 
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