catalytic converters
I have recently chose to replace my failed catalytic converter at my local muffler shop with the proper oem part instead of genuine Subaru cat. The original cat failed at around 250,000 miles. Unfortunately I have had to replace the oem 3 times with each one failing in about 4 - 6 weeks after installation. The o2 sensor was also replaced twice. The first two were replaced under warrenty but the shop refused to warrenty the third failed. My mechanic insists the car is running well and that the problem is that I was a cheapskate and didn't buy a subaru cat. Do I have to bite the big one and shell out for the subaru cat? shouldn't the oem cat work as specified?Help