The other day, flooring the car in a tunnel I noticed I left a cloud of smoke behind me. Next day, my dad was driving behind me and he said he could see some black smoke coming from the exhaust while doing city driving and nothing when we reached the highway.
Cats (Magnaflow) and oxygen sensor have less than 3000 kms.
Unfortunately I barely drive the car and when I do, it's almost all city driving, definitively not its habitat. Do you think some more highway driving and a good injector cleaner should fix the problem or is there something else I should check? I haven't looked for codes yet, I didn't have time.
Thanks in advance.