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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This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:01:32 EDT