UK Car Repair Questions? Ask a Mechanic for Answers ASAP
Hello, I'd be happy to help! Let me start by saying that if you removed the internal parts of the converter and didn't replace it, then the check engine light won't be able to go out because the computer measures oxygen and emissions content directly after the converter, those inner pieces clean the exhaust so if it's not cleaned in a predetermined amount the light will illuminate, you will also fail an emissions inspection if they have those where you live. The brake booster is the cause of your hard brake pedal, they are notorious for going bad on these vehicles, but make sure of you replace it get a dealer booster, the aftermarket boosters for these always go bad again. To see about the cutting off we'll have to have it scanned for codes other than the catalyst efficiency code that will be present.
No problem! The converters won't force the engine to cut off unless they are severely clogged. How did you remove the inner materials? If you tried to blow it through the exhaust system it is possible that some are lodged in the muffler, enough of that and it could cause to to shut down on its own, or the shutting off could be entirely unrelated to the catalytic converter issue, depends on what codes you pulled. The converter itself I don't think is hard to do, so any experienced mechanic should have no trouble with it.
That is crazy that it has such low mileage with converter issues. If there's any more questions let me know. Please don't forget to rate, they won't compensate me unless I've been rated. Thank you! Good luck!