[doug]

light is on at 42000,is this just the service light(mileage)?

 

[TrailLeadr]

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?

 

[LOW_07]

'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.

 

[doug]

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