Bad gasoline certainly could cause the warning lights to come on as you observed. (Look at the SIMILAR THREADS at the bottom of the page.)
But we would need more details to answer your question. The 'rich' running at cold start could have made the plugs sooty looking but that would be normal.
What was the code that the CEL indicated?
Also, how long has it been since the dealewr's oil change? You should be doing an under-hood fluid check at least monthly.
At 37K miles there probably isn't any major issue.
But we would need more details to answer your question. The 'rich' running at cold start could have made the plugs sooty looking but that would be normal.
What was the code that the CEL indicated?
Also, how long has it been since the dealewr's oil change? You should be doing an under-hood fluid check at least monthly.
At 37K miles there probably isn't any major issue.