Check engine light
Today i was driving on a really busy road, was stuck in traffic for a bout 45 mins.
At one point the check engine light came up but no messages on the dashboard. This has happened before, i went to the repair shop and the mechanic told me to drive it a bit on the highway. After that the light was gone.
The question is there something with the exhaust gas from other cars that go in to the system that can make a check engine light light up?
Thank you in advance.



