On that same note, will a OBD-II scan tool tell you which sensor tripped
the check engine light ? IOW, I have a 99 Dak also, and never had to
change a sensor, but I know I'm running on borrowed time at this point. If
I have a sensor go bad, how can I figure out the bad sensor ? Will the
code tell me ? I'm pretty sure I have 2 02 sensor's. Does the code get
specific enough to tell me which one is causing the fault?
Just understand that the scan tool isn't always right. More to the point,
just because it says there's a problem with xxx sensor, doesn't mean that
xxx sensor is bad. Case in point: a friend of mine had a CE light on,
scanned it, and saw that the O2 sensor (pre-cat) was reporting lean. He
replaced the sensor, cleared the code, and within minutes, the code was
When we actually looked the engine over, we found the intake manifold gasket
was leaking, allowing more air in than the MAF was reporting, and causing a
lean condition. The O2 sensor was working perfectly - the mixture WAS too
lean. He thought he could fix the problem in 10 minutes with an $80 part.
As it turned out, it only cost about $20, but about three hours, to do the
job right. Needless to say, he didn't get his $80 back, and after buying
lunch and beer, was out even more cash :)
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