Check engine(idiot) light

[Jaques Bonet]

NINE CHANCES OUT TEN IT'S A EMISSION SENSOR,IF MEMORY SERVES ME RIGHT IT'S THE ONE CLOSEST TO YOU ENGINE ON EXHAUST PIPE OR THE ONE BY THE CATALYTIC COVERTER. THOSE 6.0 MOTORS ARE  GOOD. GOOD LUCK

[NRA4LIFE]

I've had 2 GMC's (6.0 litre right now) and a Chevy.  I believe every single time my light went on it was an EGR valve or some other emissions sensor.

[Woodchuck]

NINE CHANCES OUT TEN IT'S A EMISSION SENSOR,IF MEMORY SERVES ME RIGHT IT'S THE ONE CLOSEST TO YOU ENGINE ON EXHAUST PIPE OR THE ONE BY THE CATALYTIC COVERTER. THOSE 6.0 MOTORS ARE  GOOD. GOOD LUCK

10 out 10 times it is the emissions sensor or the 300+ other things that can set the light off. 

[jackelope]

Nock Nock-
Go to your local auto parts store and have them retrieve the code for you. Reply back here with the code and we'll see what we can do to help. The truth is there's a couple hundred different reasons that light could be on. All sorts of possibilities...
There's no such a part as an "emission sensor". There are multiple sensors that are emissions related, but not one called an emission sensor.

[elkaholic123]

Maybe O2 sensor

[cbond3318]

The last time I had a tech at Auto Zone pull the code, he was able to look it up on his computer for me. It was a COP on a V10, he then pulled up the diagram of injectors so I didn't have to chase all 10. Very helpful.

With the code in hand, google is your friend or post on here like Jackelope said.

[lokidog]

You are going to risk a $30,000+ piece of equipment to save some time and/or $100?    

[mtbeav]

I have a simple fix
small piece of black tape, no more annoying  red light.   

[huntnphool]

The light in my 2002 Chevy Silverado (5.3) has been on for about a year and a half. My father in law plugged his code reader into it last summer and reset it. It was off after that until the next time I drove my truck, and then it came back on, and has been on ever since. The truck runs fine, I assume I just may not be getting the best gas mileage.

 Will be fine until your next emission test for licensing.

[bobcat]

The light in my 2002 Chevy Silverado (5.3) has been on for about a year and a half. My father in law plugged his code reader into it last summer and reset it. It was off after that until the next time I drove my truck, and then it came back on, and has been on ever since. The truck runs fine, I assume I just may not be getting the best gas mileage.

 Will be fine until your next emission test for licensing.

We don't do emissions testing where I live.   

[Buckmark]

Knuder valve next to the thingamgiggy attached to the catastrophic converter   

You could take a picture of your wife, poke holes in the eyes and place it over the MIL so at night you would have a eerie stare at you...

[jackelope]

The light in my 2002 Chevy Silverado (5.3) has been on for about a year and a half. My father in law plugged his code reader into it last summer and reset it. It was off after that until the next time I drove my truck, and then it came back on, and has been on ever since. The truck runs fine, I assume I just may not be getting the best gas mileage.

 Will be fine until your next emission test for licensing.

We don't do emissions testing where I live.   

Same here. I just like to fix my truck when it's broken. 217k miles and going strong. Driving it east this weekend for about the 167th time since I've owned it.

[bobcat]

The light in my 2002 Chevy Silverado (5.3) has been on for about a year and a half. My father in law plugged his code reader into it last summer and reset it. It was off after that until the next time I drove my truck, and then it came back on, and has been on ever since. The truck runs fine, I assume I just may not be getting the best gas mileage.

 Will be fine until your next emission test for licensing.

We don't do emissions testing where I live.   

Same here. I just like to fix my truck when it's broken. 217k miles and going strong. Driving it east this weekend for about the 167th time since I've owned it.

I agree it's a good idea to fix things as they come up, it's just not been a priority for me since I rarely drive my truck anymore. I do try to drive it at least once every weekend, but usually I only put 5 to 10 miles on it at a time. Had the truck for almost 14 years now, and it's only got 140,000 miles.

[Kittman]

Looks like you have a nearby parts store which will be able to get you started with a code reader:

1016 N Mission St, Wenatchee, WA 98801

With a pen & paper handy:

There will be a plug about 2" wide under your steering wheel/column and this will not take but 3 minutes to get the code(s).  Then turn ignition on but do not "Start" or turn over starter motor.  After a few moments the diagnostic scan tool reader will spit out something like P 0XXX only with numbers, they can look up the numbers, or you can go Google, YouTube, etc. what the number means and what might be needed to repair.  Do not be surprised if you get several different numbers.  sometimes some codes are interrelated, and others may indicate separate issues.

Nothing scary to do..No cost.  The actual repair...well that is a different matter though.

[jackelope]

Also it's good to note that the code reader is not going to tell you specifically what part is bad. It will tell you there is a misfire code but it won't tell you ... you have a bad spark plug... or something along those lines. Once you have the code you either actually diagnose the problem or shotgun/guess some parts at it.