Use an engine diagnostic code scanner to find out what's wrong.
or if you have less then 150k miles on the car, and Honda dealership in the USA has to replace the O2 sensor and any other parts that are directly associated with your emissions. This is part of Honda's national emissions warrenty even if you are not the first owner of the car. I had the same problem with my 96 Honda civic lx and they replaced my O2 sensor, catalytic converter, and exhaust manifold at no charge to me at 142K miles. good luck.
check the codes and see what comes up, that'd be where i start...
i don't think that there are Honda civic EX on Honda civic GX, but there is a Honda Accord EX maybe that's what you are looking for. you can check some free car classifieds on the internet to know more about the car you are looking for honda civic ex is the one that comes with power windows power locks and sun roof and v-tec engine
The 1996-2000 Honda Civic came with the 1.6-liter SOHC 4-cylinder 16-valve engine.
Check your brake fluid level!
Have vehicle scanned to determine problem
Unfortunately, the Honda Civic SI only comes with a gas-powered engine and is promoted as a sporty car. It does not offer a hybrid option, as do some of Honda's other models.
Fuse
Honda civic 1997 comes out with 175/65r14 size 14inch wheels Honda civic 1997 comes out with 175/65r14 size 14inch wheels
It is underneath the car, at the exhaust manifold where it comes off the engine...access it from the bottom
The 2005 Honda Civic has a timing belt that must be changed every 105,000 miles or 10 years whichever comes first. Warning: This is an interference engine.
Honda engines need special care when it comes to oil changes - it is possible you need an oil change. You could also trying to flush out the old oil and replace it with new.
The 2013 Honda Civic VTec comes with 201 horse power, a 4 cylinder engine, and a aluminum allow engine block. It has a one touch moon roof feature 5 inch LCD screen, and has a combined gas mileage of 25 mpg.