I GOT A HONDA CIVIC 96 WHEN I BOUTH IT IT HAD A FULL CATBACK EXHAUST I RECENTLY TOOK IT TO PASS AN EMISSIONS TEST AND MY CHECK ENGINE LIGHT WAS ON, IT FAILED AND THEY TOLD ME I NEEDED AT H2O SENSORS that deals with the exhaust..i dont really know what to do because they told me the only way to fix it was to put the hold exhaust system back on and change the sensor ...is there anyway i can fix the problem keeping my exhause muffler on the car...please help if you have any idea..?

 

well you could try changing the o2 sensor.....Unless you have a high flow cat there shouldn't be a problem.

 

im not really sure if i do or not how do you know?