frustrated andy

Plugs 6 &8 showed misfire and another one for ruff ideal and the cat code put my 2018 Silverado in safety mode .

The truck has went into a safety mode because of the catalytic converters codes. I've called a Chevrolet garage to come get the junk .

Yes new y pipe and cats , muffler all new system and it's oem parts

I've had code cleared several times by machanics the light comes back on in just a few miles.. ????

I have a 2018 Silverado 5.3 the check engine light stays on ,code 420 and 430 . I have replaced the exhaust (y pipe back) and the sensors , I've replaced the spark plugs and wires light is still on and reading the same codes. Need help with it