Your civic could be running too rich because you used bad gasoline. It could also be running rich if a spark plug needs replaced.
Your car is running too rich.
Your injectors are leaking, or your O2 sensor is dead, or misreading.
You either removed the catalytic converter or you are running too rich.
on a 2004 civic coupe, running 205-40-17 and they seem accurate.
a 1980 civic hatchback , that thing still running,
Yes
Malfunctioning emissions system. Get this repaired. Engine probably running rich from a leaking fuel pressure regulator. If there is fuel in the vacuum line the regulator is bad.
The running lights have a bad ground.
first and best thing to find out is if your running rich or not your fuel to air ratio might not be just right. check your oxygen sensor and do a full tune up.
DRL - Daytime Running Lights
Daytime running lights on a Honda Civic are the same as normal headlights. To fix or replace them, locate the headlight housing in the front of the car. Remove the plastic housing and replace the bulbs.
My 1998 suburban right side is running rich. I was hoping to find a soulutin to your question Mike