1998 Acura TL 3.2 p0133 & p0153
 

I have a 1998 Acura TL 3.2 with about 151,000 miles. Car runs perfectly. Check engine light came on. p0133 & p0153 are the codes listed. I decided to use a multimeter to try and check both sensors before replacing them but when I connected the multimeter, it seems like both are working because the numbers jumped up. What could the issue be? Should i still replace the sensors?