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2000 Pontiac Montana won't pass smog check due to emission readiness monitors.

My car won't pass the emission smog test because of readiness flags. I have changed the spark plugs, 02 sensor, and had an oil change done. Still no luck. Any advice?
Answer:

We recommend driving for at least 200 miles in a variety driving conditions; traffic, freeway, city, stop and go. Getting the emission monitors to set can be tricky. Continue driving with 1/4 to 3/4 tank of gas, and in all sorts of driving conditions in order to get the required emission monitors to set. You'll need to make at least one trip where you park the vehicle for at least 1 hour and then restart it. This is required to set the EVAP monitor. posted by SmogTips Support

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