no I had a 21 too! it was a bad front o2 sensor apparently... I replaced it,
and its running better than ever...
wes
----- Original Message -----
From: "ABadDakota" <bad93dakota@yahoo.com>
To: <dakota-truck@buffnet.net>
Sent: Monday, May 21, 2001 3:17 PM
Subject: Re: DML: o2 sensors and code "21"
> 12 just means that the battery has been
> disconnected within the last 50 cranks.
>
> 55 is just the end of the codes.
>
> You will not ruin your engine by running it.
>
> Tom
> --- Wes Weems <wweems@fix.net> wrote:
> > ok,
> > I was crusing around in my fatty dak, when the
> > check engine lite when on....
> > I proceded to pull codes and it gave me, 12,
> > 21, and 55. I cant explain the
> > 12 (but its just a warning anyway) and the 55
> > is just the last code that
> > would have been spit out. My question is what
> > kinda symptoms would you see
> > if the o2 sensor went out? this is the
> > definition for 21.
> >
> > Upstream oxygen sensor voltage shorted to
> > ground (tested after key off and
> > at start to run) ** or
> > Left oxygen sensor input voltage maintained
> > above the normal operating
> > range. **
> > or
> > Upstream oxygen sensor response slower than
> > minimum required switching
> > frequency or value does not go above .65 volts.
> > **
> > or
> > Upstream oxygen sensor heating element circuit
> > malfunction. **
> > or
> > Downstream oxygen sensor voltage shorted to
> > ground (tested after key off and
> > at start to run) **
> > or
> > Downstream oxygen sensor input voltage
> > maintained above the normal operating
> > range. **
> > or
> > Neither rich nor lean condition detected from
> > the downstream oxygen sensor.
> > **
> > or
> > Downstream oxygen sensor heating element
> > circuit malfunction. **
> >
> >
> > what do I do? Replace both 100$ sensors? and if
> > I wait a while is going to
> > ruin my engine?
> >
> > Wes
> >
> >
>
>
> =====
> 93 Black Dakota CC 5.2 Auto, MP Camshaft, MP Computer, MP Valve Covers,
Doug Thorley Headers W/ 3 " Exhaust, Jacobs Ultra Ignition, FMS Injectors, K
& N Air Filter, and Boyds. Coming soon ...3.91 Gears and Trans Shift Kit.
>
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