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Forum > Failed Smog Test > Question

2001 Ford F250 Check Engine Light ON - Failed monitor readiness smog test.

My truck failed the functional part of the smog check. There are no trouble codes in the ECM. My truck also failed the MIL/check engine light due to failure to successfully complete all OBD self tests.
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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