p0422

After being diagnosed as being caused by a loose vacuum hose in the engine bay by a more experienced mb tech and fixed...my check engine light came back on. Again, on my obd ii reader it's giving me the P0422 code caused mainly by faulty catalytic converters. It can also be caused by engine...

Just got a check engine light and BAS/ASR light come on this morning. I took it to a auto parts store to have the codes read and the only thing it threw back was a P0422. Definition: Catalyst efficiency low-bank 1 -probably causes: Cats defective, engine misfire, large vacuum leak or engine...

So I have this error code which means I think (someone please enlighten me) that either a cat is kaput or an o2 sensor has gone south. How can I simply (for which read cheaply !) check the o2 sensor. Also the error code says bank 1 - does anyone know which bank that is in relation to me when...