A clogged convertor will cause driveability problems, hesitation, loss of power.
The code they probably got was a downstream O2 sensor "effeciency below threshhold", this is generally fixed by replacing the downstream O2 sensor(s).
A convertor backpressure test will confirm if convertor is clogged.
I would get a second opinion and if it is an O2 sensor, I would avoid the shop that wanted to replace the convertor.
Factory Toyota convertors are NOT cheap.
Wednesday, September 2nd, 2009 AT 6:47 AM