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Originally Posted by hockey7711
I have a 1987 mercedes 190E, i just had it smogged and it passed, but the hydrocarbons are pretty high. Doing some research online, it said that it may need a new sensor. As far as I know, it;s the original one in there (244k miles)
Is this a fairlyeasy thing to replace?
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Your sensor is too old. Change it, emmisions and fuel economy will improve. However, a vacuum leak can lead to high HC readings. Check for a leak first.