I went to get my smog today and i failed on the 15mph test, but passed on the 25mph test, What should I do to remedy this? they guy told me I can try a fuel injector cleaner, and try again, but will a bottle really do the trick?? or do i have to replace soemthing like the cat? the car has 200K so its a high mileage engine.???

 

What did it fail on? Surely he gave you a printout.

 

it failed on the low speed NO (PPM) test something to do with the emissions, and the burn off of i guess unused gas??