Truck:
1997 Dakota 3.9 V6 Auto 152K miles
Problem:
Truck starts and runs fine, but 2 or 3 miles down the road it begins to
sputter and lose power. It almosts acts as if it's not getting gas and
wants to die. Turning the truck off and restarting fixes the problem and
then the truck can be driven 50+ more miles without problem (this has
happened 3 or 4 times now).
The check engine light comes on sometimes but will go off by itself. I've
checked the codes and get the following: 12, 21, 55. I've know that the 12
and 55 are common and the 21 is related to the o2 sensor.
The catalytic converter recently began rattling. About a week after the
rattle began, the check engine light came on and the troubles began. The
cat. and muffler have since been replaced, but the problems continue.
Nothing else has been replaced (o2 sensors are both original).
No change in fuel mileage or performace other than the symptoms mentioned
above.
Questions:
1. Can a bad o2 sensor cause these symptoms (stutter, no power, kill
engine)?
2. Code 21 relates to both sensors.....which one is more prone to dieing?
3. Is it normal for the check engine light to come on and off by itself (I
always thought it needed to be cleared once on)?
4. Could I have a fuel problem that just happened to show up with a bad o2
sensor but won't trip a specific code?
Thanks for the help.
--Aaron--
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