What happens if your catalytic converter fails the smog test?
What happens if your catalytic converter fails the smog test? Should your vehicle fail the smog test the CAT may be suspect. A vehicle's catalytic converter usually becomes plugged after a material breakdown within it normally due high exhaust temperatures and rich fuel. After first inspecting the fuel and ignition systems, an intrusive CAT test and Back Pressure/Vacuum test may be performed. Why is there no smog check in California? I took it to an “official” smog check station yesterday morning but was told it could not be smog checked because it would fail the test. This was before the...