Anyone now if this could be something else. I don't think I should have to replace o2 sensor after only three months. Is this really going to effect anything if I drive with light on. I don't have the time or money to deal with this kind of crap. Nobody has been able to offer an answer on this so far. What about disconnecting completely? Could this harm the engine in any way? How much could it actually effect gas mileage?
Thank in advance. K
My guess is that you replaced them with Bosch sensors. Bosch sensors do not work well on some (many? all?) Chrysler products. Daniel Stern used to say this, and I was skeptical, but I have seen thread after thread after thread on the various LH car forums by people who learned the hard way attesting to the fact that it is true. Get them from the dealer. Also NGK's work well (I think for some years they are the OEM sensor).
Must be a new trouble code. I've never seen a code that says an O2 sensor is faulty.
The answer is it needs to be properly diagnosed.
Can't help with the money, but, if you used the time you've spent whining about it and throwing parts at it, on actually diagnosing it instead, you'd be better off.
Disconnecting it will guarantee the light will always be on. Then you'll never know if something worse has developed.
In addition to monitoring cat condition, the downstream O2 is also used as an input by the PCM to determine upstream O2 goal voltage. Fuel mileage may be a concern, but I'd be more concerned about what would happen to the cat if it ended up running too lean.
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