I was just driving on the highway and i hit a small bump and immediately my check engine light went on. Then about 2-3 seconds later the VSC OFF and VSC TRAC (i think) came on too. Any ideas? The only thing ive done recently is have new tires installed.

 

your VSC system lights will come on when the check engine light comes on. it is a fail safe system that shuts down part of the vsc system to avoid engine damage if the computer detects an engine problem, i.e. yuor check engine light coming on. not sure what the light is for without knowing the code. autozone will tell you for free.

 

Get the code read, post it and then people can help you.

 

What's your mileage? 99% of these CEL's seem to be related to the O2 sensor going out.

 

103,000 - im gonna go to autozone today for the codes.

 

K&N cold air intake....Hmmmm. Did the light appear after you installed it or has that been installed for awhile? It's not a popular item to have on the 3.4L. Just a thought

 

the K&N has been installed for about 2 years without any problems, this light came up 2 days ago

 

i just got the code. It says PO420

1) Catalytic Converter defective
2) Engine misfire or running condition
3) Large vacuum leak
4) Engine oil leakage into exhaust-valve guide seals, piston rings

any suggestions?

 

My code book reads its the cat.