Hi all,
I have a '96 850 turbo. I started getting poor performance and mileage when the check engine first came up w/ catalyst error code. I reset that. Then came 02 sensor code, then misfire cylinder 3 code. I reset these and got catalyst again. So, I went to the shop (Cinderella Carriage in Cambridge, MA where I live) and they replaced my catalytic converter ($1600). They must not have road tested it b/c it idles poorly, power is down, there is a lot of exhaust which smells horrible and mpg is down ~%50.

Now I have two new error codes: too rich bank1, too rich bank2. The vacuum system was totally overhauled 3 years ago, both 02 sensors have less than 40K miles on them.

Before I let the shop in there again, Is my MAF going? Can I test this somehow? Can I replace this myself?

THANKS in advance!
Marcus