Catalytic Converter Clogged, No Check Engine Light...
So, this is my GF's car.
Bought in December, cat failed (it clogged up according to shop who sold her the car), they replaced for labor cost only but with a aftermarket non-OEM cat.
30 days later the cat fails again, same symptoms and same problem. The car starts real hard, runs real rough, sputters and has very little power. The shop replaces again, but charges her labor again.
45 days after that, cat fails again. Exact same symptoms...The same shop blames poorly made after market cheaper cats (cheaper than the dealer ones), but also say they don't have many problems with them. Just on this car. They don't think anything else is causing the failure. There is no check engine light at all during all of this. It uses about 1/2 bottle of oil / month but no leaks visible on the ground in the driveway and no smoke at start up.
HELP. Is there any help?