2008 GMC Sierra (check engine light)
 

I have a GM that just started with engine light that came on, I checked fuel cap, and air filter and found nothing. How do you get the code off the thing?:D

Thanks Bob

Here are the codes... P1133 heated QX sensor insufficient switch bank 1

P3400 cylinder system bank 1, intermittent

Any one knows whats going on???

You should be able to take it to any auto parts store or garage and they can tell u what it is and turn it off