- This topic has 2 replies, 2 voices, and was last updated 9 years ago by .
-
Topic
-
Hey Guys,love the forum but first time posting.
I have a 2002 Grand Prix 3.1 this time and it is throwing a po137. Checked the live data and that downstream sensor would start off fine and show good normal voltage between .4 and .6 but then the longer I drive it creeps down to 0 where is bottoms out and ultimately stays after about a 15 min drive.
Popped the old o2 sensor out (obviously garbage) and replaced with a known good sensor from another Grand Prix I have. Same thing happens with that one.
What would cause it to start off great but then lose function after warming up if it’s not the sensor?
Any help is much appreciated.
- You must be logged in to reply to this topic.