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CO? That means Carbon Monoxide - it's a rather toxic and poisonous gas emitted from the exhaust system.
When they check emissions on cars CO is one of the gases they measure. If the level is too high .. your car fails the emissions test. I believe in the USA the emissions test is known as the 'smog test'?
If you have a problem with excess CO emissions on a car the cause is often an incorrect fuel/air mixture or a faulty sensor called the lambda/oxygen sensor in the exhaust system
High CO usualy means the O2 sensors are not reading properly. Take it to a parts store that can read codes, I know Auto Zone does in my area. If it is the O2 sensor it is an easy fix but the sensors run about $50.00 each.
theres 3 things ur emisans fail on 1 spark plugs 2 air filters need changing 3fuil filter so yes a full service should do it change ur oil fuil filter air filter oil filter and oil
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