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Old 06-16-2011, 03:37 PM   #1
Econdron
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Default Emissions monitors not ready

I have a 1997 saturn sl2 with 142 thousand miles. It drives fine, but idles rough. I've had to do a lot of work on it since my original purchase but not a whole lot relating to the emissions stuff. I brought it in to get tested and the oxygen sensor and the egr monitors were "not ready" everything else was fine. They said drive around for a week or two and then come back. I did just that and got the same results. Took it to a technician who claimed that the thermostat was bad and replaced that. He said he did a lot of testing a did a lot of work to get all the monitors set to ready. The third time I brought it in it had the same results. I'm completely lost now and have no idea what to do. I brought it to an auto parts store who did a free scan with their OBD II tool and it said all the monitors were on and he reset them saying they should have been fine but he reset them anyway. So I'm confused, why is it that every one else's scan tool says the monitors are fine but the emissions place doesn't? Any suggestions?

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Old 06-16-2011, 03:55 PM   #2
fdryer
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2003 L-Series 3.0L Sedan
Default Re: Emissions monitors not ready

1-You're a new member!

2-Newbies with this issue on an old S-series car aren't aware of the infamous original faulty coolant sensor failures. If yours is the round nosed plastic one, replace it immediately with a brass one from any auto store. Your mechanic was so close with a t-stat replacement but not close enough. See below.

Once replaced the car should pass all readiness monitors. The failed coolant sensor won't allow the engine to warm up so emissions self testing halts until the problem is solved. And you won't have to drive all week after replacing the coolant sensor, just one drive should do it so drive one day and inspect the next day.
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