I recently took my car to a shop,because it was idling rough and there was a shudder going around 45mph,the shop told me I need a 02 Sensor and a Tune-Up will a bad 02 Sensor make a car shudder?

 

In my experience only a few times have i seen an o2 sensor cause a shudder in the form of a misfire, it is rare but possible. If the o2 sensor reading sticks at one spot instead of switch rich to lean It can cause a rich or lean misfire, you need to look at scantool data to determine that is the case. Is the service engine soon light on with trouble codes set?

 

The Engine light is on,but I'm not sure about the codes,but I read where the O2 sensor going bad can cause poor gas mileage which it has,fumes,and it's kinda hesistant to start in cold weather.Any idea what it could be?he also mentioned doing a tune up