o2 help please
Thread Starter
3rd Gear
Joined: May 2005
Posts: 3
Likes: 0
o2 help please
I have a 95 auto that had the front o2 sensor replaced about six months ago. In the mean time the coil went out (only partially) and was sending only a small amount of fire to the plugs. After replacing the opti-spark we found out it was the coil- oh well it needed one anyway.... now it showed the second bank o2 sensor was tripping the code and the car was running very very rich. we replaced the passanger side o2 sensor after the cat. On the computer it showed the readings at around .88-.94 while normal driving. yet the car was still rich (read black stuff all over the back of my car) and the SES light comes on after the loop opens. I disconnected the front o2 sensors and the car seems to run almost perfect just a little rich and the computer says the disconnected sensors are reading .45 I also can only find three sensors on the exhaust sytem (stock) two on the passenger side one pre cat on th edrivers side. any help or suggestions would be appreciated. 
Thread Starter
3rd Gear
Joined: May 2005
Posts: 3
Likes: 0
Thanks, I need to get one-I did however find out today that the first o2 sensor I had put in does not work-replaced it and everything is fine-although Chevy still says there are four sensors on my car...
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by khy
Thanks, I need to get one-I did however find out today that the first o2 sensor I had put in does not work-replaced it and everything is fine-although Chevy still says there are four sensors on my car...
