bad o2 sensor making default rich?

[Blaze4G63]

i think my o2 sensor is bad i have unpluged it when the car is running and no change in the running of the idle or anything...what is the voltage on the 02 sensor so i can check with a voltmeter looked everywere cant find it its a 91 tsi awd

 

[Joshuah Stedman]

Well if it's bad you'll get a voltage reading of either 0V or like something crazy high(4.X..). The normal operating voltage is (when @ OPT) should be about 0.20v to around 0.70v.

 

[USER_22]

Unscrew the O2 sensors and look for a burned white color. If you have that color on the sensor, you may need to replace them.

 

[Blaze4G63]

i dont have a logger yet its coming in the mail ask we speak

 

[Spoolin18]

Unscrew both of the O2 sensors and look for a burned white color. If you have that color on the sensor, you may need to replace them.

IIRC 1gs have only 1 02 sensor, its in the 02 housing, 2gs have 2.

 

[LiquidX]

Unplugging the sensor is just going to make the car run richer.