Has this happened to you you or someone else did a routine check or replacement of your cars air filter and then your check engine light came on a short . Patient is a 2002 trailblazer 42 presenting with a p0440 gas cap was already replaced and p0440 persevered i use a snap on solus to evaluate the evap . P0440 obd ii trouble code evaporative emission control system evaporative emission control system malfunction p0440 causes the check engine light to go . Evaporative emission control system malfunction the check engine light came on a few weeks a few weeks ago the check engine light came on with a code of p0440. Repair information for p0440 chevrolet code learn what does p0440 chevrolet evaporative emission system means how to reset the check engine light find codes by
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