I don't know how may miles are on your 99.
The 420 code can be caused by misfiring, which can kill the converter if
not
corrected .
It also is sometimes caused by a bad O2 sensor (front or rear)
Since the front sensor is more likely to fail than the rear, and if
everything else has failed,
Try replacing the front sensor before you spring for a converter.
"Pat Dreiding" <patdreiding@[EMAIL PROTECTED]
> wrote in message
news:V0Psj.1238$%g.806@[EMAIL PROTECTED]
> Bruce,
>
> Will do as long as you can point me in the right direction. How do I
access
> the O'2 connectors and recognize them.
> It's not in the index of my workshop manual. Could they be called
something
> else? I didn't find anything in the miata.net garage to help. Are the
> connectors hoses or wires. Sorry for all the questions. I don't know
where
> to look.
>
> Thanks,
> - Pat
>
> "BRUCE HASKIN" <BruJan@[EMAIL PROTECTED]
> wrote in message
> news:15492-47B3AFC0-218@[EMAIL PROTECTED]
> > Pat, do this first !!!!!!!!
> >
> > Check that there is NO water in the O'2 connectors. (blow out with
air)
> >
> > Go back and remove the "ground cable" from the batt. ( I don't know if
> > your radio needs a code to restart, but find out what it is before you
> > do this!)
> > Wait about 5 mins. and put the cable back back on.
> > Reset all of your radio stations :-) and start your car. " IF " the
> > code comes back, then go start looking at other items to cure the
> > problem.
> >
> > Removing the cable, lets the computers reset themselves and many times
> > that is all you need to do.
> >
> > Good luck and I hope this helps.
> >
> > Bruce Bing '03 LS
> >
>
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