Volvo RWD 900 Forum

INDEX FOR 1/2026(CURRENT) INDEX FOR 11/2004 900 INDEX

[<<]  [>>]


 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Oxygen sensor and ECU questions 900 1995

posted by  Laozong on  Sat Feb 8 15:00 CST 2003
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

I'm still tracking an intermittent idling issue. I've ruled out vacuum leak because the bouncing rpm needle never go beyond 1k so I deduced it to be the fault of some sensors. The IAC was replaced with a used one to no effect. I've moved on to the O2 sensor, which I've replaced about 2 yrs back.

When I pulled the connector off the O2 sensor and ran the car to see if there is any apparent changes, I noticed there is none although the lambda sign came on in the dash.
The car is running the same, the idling is just as erratic, no worse and no better.
Does this mean the O2 sensor was not working at all and it is the cause of the erratic idling.

Also how do I do if the ECU is not faulty?

All inputs welcome and thanks everyone for all the suggestions and advice.

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.