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?

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