2006 Cadillac SRX - P0437 Code

po430 code change cats and sensors still comes on

A code P0430 may mean that one or more of the following has happened:

The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
There is an exhaust leak

Of the 3 causes, the most expensive is replacing the cats. I’d have checked for an exhaust leak first, replaced the O2 sensor next, cat last.

there is no exhaust leak did a smoke test on the exhaust you said to replace the sensors i just did the downstream do i need to do the up stream i also did a smoke test on the intake an there was smoke coming from the back of the intake manifold check the brake canister hose it was very soft and lose cut a little of the end of not as much smoke then i have ordered a new hose not here yet but usually a vacumm leak will cause the motor not idle good but it purrs like a kitten i will do another test after i install the new hose it may be a bad intake but that shouldn’t give a po430 code