I’m curious what suggestions people might have. Here’s my scenario:
I have a 2001 Subaru Forester. 186,000 miles. Mostly highway miles. I love the car.
I bought it at 90,000 miles. Great condition. I do all the regularly suggested maintenance, including oil changes every 2,500-3,000 miles.
The Check Engine light has come on a few times. Usually it’s been either the front or rear O2 sensor.
However, I had to replace the catalytic converter the first time back in 2010 (at 120,000 miles).
Now, at 186,000 the Check Engine light came on again, and it indicated another catalytic converter failure. I also needed a new front O2 sensor.
(The light had been coming on and going off every few weeks for months.)
My questions are:
I had a cracked radiator about 1,000 miles ago and had to replace it. It was leaking antifreeze. Is it possible the leaking coolant might have corrupted the catalytic converter this time?
Given that I’ve had to replace the catalytic converter twice, is it likely that there’s a deeper cause, some other kind of engine malfunction? (My mechanic said that most catalytic converter failures are due to ‘bad gas,’ but he wasn’t able to tell me how to distinguish ‘bad gas’ from ‘good gas’, just that the good stuff usually comes from the well-known brands like Shell, Exxon, etc.)
Is it time to sell it before this third catalytic converter fails?
Thanks for any and all input!