The test that is performed has very high standards, meaqning they give you alot of lee way when being tested.
I recently had my 99 D2 tested after moving into Colorado with nearly 60,000 miles on the plugs and wire and a clean crank case. My highest test came back at about 2% of the allowable measurement..
The test is nearly worthless cause most vehicle will pass even when running poorly. If they really wanted to clean up the air, the range of tollerance would be so high that most wouldn' pass and people would just complain.
As for your 10 year ols O2 sensors, if you have or 100,000 miles on them, your truck would run better, get better MPG and performance if you would replace them.
Mike
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