I recommend running the truck hard (3-4000rpms) for a few miles to burn off any
debris or buildup that might have accumulated on the sensor. Then clear the
code by disconnecting the battery. If it comes back shortly - then replace it.
Latr,
Shane
Wes Weems 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
-- '96 IndyRam-HisIndy-MPI/TB/Pulleys/AccelCoil/MPComp/HookerSuperComps/CompTAs '96 IndyRam-HerIndy-numbered(#142)"Track Truck" '74 Triple-Black Dodge Challenger Rallye 360 home-brew EFI R&D vehicle '68 Black Corvette Convertible 427 (For Sale)
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