If it's multi-wire O2 Sensor(s) then yes they cost ...but if it;s single-wire, you can pick them up "new" off eBay for about $30. And yes, O2 Sensor(s) could cause you to run too Rich or too Lean depending on whether it's clogged or it's faulty. As suggested earlier ...have a look at your plugs for deposits ...maybe rich fuel mixture but could be oil beginning to get into the combustion chamber. If you haven't done so already, do a compression check.
Quote:
Originally Posted by igya
Yep, changed out all the usual stuff and the light IS on. I was just wondering if an O2 sensor could cause a rich mixture. And, would the rear sensor need to be changed along with the manifold sensor? They're $71 a pop, and that a lot of Big Macs!!!
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