I drive a 2003 Dodge Grand Caravan with 110,000 miles.

I had my check engine light go on a few months ago and a code that
indicated a catalytic converter problem.
The light was inconsistent for a period of several weeks with it
sometimes being off for a few hours or even a few days.

I had a mechanic do a diagnostic and recieved an estimate for $650 to
replace the converter. I balked at paying this, especially after doing
some research and seeing that there are a variety of factors that
could be causing this problem.

While having my oil changed, I bought the fuel injector cleaning
special. The mechanic told me I really needed the cleaning judging by
the amount of smoke he observed..

To my suprise, the check engine light was outright after the cleaning
and stayed out for over three months. I thought me problems were
solved for $39.95.

Unfortunately, the light went back on last week.

Any opinions on this? What would the partial solution obtained by
cleaning the fuel injectors indicate?

Thanks in advance for any advice.

Rob