# Oxygen sensor Heater circuit testing? **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [June 28, 2009, 4:58pm UTC](https://forums.speedlife.net/t/oxygen-sensor-heater-circuit-testing/69800 "2009-06-28T16:58:02Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Viper966](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/viper966/32/7268_2.png) [@Viper966](https://forums.speedlife.net/u/Viper966)\ **Post date:** [June 28, 2009, 4:58pm UTC](https://forums.speedlife.net/t/oxygen-sensor-heater-circuit-testing/69800/1 "2009-06-28T16:58:02Z")
One of the oxygen sensors in my car is being a PITA and shorting out… and it causes a fuse to pop in my DME and then throws the car into limp mode… I need to figure out which o2 sensor is causing the fault… Does anybody know if you can test resistance on them to see if a short is present? Will the heater circuit show continuity when tested if good? or should it show an open circuit?? Its kind of a PITA for me to change the 02 sensor with the headers, so i would like to be able to know which one is DOA before diving into swapping them