Volvo RWD 900 Forum

INDEX FOR 1/2026(CURRENT) INDEX FOR 2/2004 900 INDEX

[<<]  [>>]


 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Oxygen sensor fault or electrical? 900 1995

posted by  Laozong on  Tue Mar 15 18:53 CST 2005
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Sat Mar 27 21:43 CST 2010
[RELATED]

940 Non-Turbo

Hi!

Having problems with O2 sensor. Replaced a used but working unit and still have the check light with 2-1-2 fault code. I know the replacement unit is working because it was replaced earlier for an idling fault but discovered later it was due to something else. So, I kept the old one.

Tested voltage: 0.5V for the green wire that goes to the CPU. Fluctuating between 0.2 to 0.4V for the sensor end terminal (black wire) when car is idling. My sensor has three wires - 2 white and 1 black.

Read here there's supposed to be a ground terminal for the exhaust. Where exactly is this ground point. Engine ground with the web-like cable from the valve cover to the firewall is okay. So where can I check the exhaust ground or what else to check?

Thanks.

Laozong






<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.