went out of town today CEL came on after about 120 miles, car ran just fine going and coming back. Had the alternator repaced rite before I got on the road. Did the CEL code check came up with 2 codes 403 throttle position sensor, and a 303 upstream O2 sensor. Should I fix these immediately or wait to see if I get the code again since I cleared the codes

thanks in advace

 

Have you ever replaced the O2 sensor? How many miles on your car? O2 sensor, if bad, will result in decreased performance as well as poor fuel economy.

~THT

 

have never replaced car has 153000 miles on it. should I replace all of them