Rep Power: 0

I have a Honda Civic 2009. When the weather below 50°, the engine runs noticeably rougher and takes longer to “warm-up “. It is definitely related to the temperature, as there are no problems in warm weather. Nobody seems to know the reason why this is. Any suggestions?

 
Rep Power: 224

How is it rougher? It's a small engine, it's going to take some driving to get it warm.

 
Rep Power: 0

It actually makes the car vibrate noticeably.

 
Rep Power: 222

Check engine light?
bad coolant temp sensor maybe? Checked filters? Sparkplugs? Bad gas?

 
Rep Power: 0

None of the above with the possible exception of a bad coolant temp sensor. Is it easy to replace?

 
Rep Power: 222

It's fairly simple, make sure you buy an oem one. Aftermarket ones never seem to work properly. I would check the temp readings with a scanner to see if they look weird before throwing parts at it

 
Rep Power: 0

Many thanks