Volvo AWD 850 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 6/2011 850 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

O2 sensors failed after replacing catalytic converter 850

posted by  Paul M on  Fri Jan 23 06:14 CST 2004
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS] [RELATED]

I had my catalytic converter replaced at a national muffler chain in November '03. Shortly thereafter my check engine light came on. Since we have purchased a new vehicle we have not been driving the 850. Today I brought it into a Volvo dealer to have spring seats replaced along with diagnosing the reason for the check engine light. The service writer told me that instad of unbolting the catalytic converter the muffler shop cut the converter out with a torch and then welded in a new one. He said although he could not prove it he suspects both O2 sensors were damaged by heat. Cost to replace is $622.00. Has anyone heard of this before? Any suggestions?
Paul








  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    O2 sensors failed after replacing catalytic converter 850

    posted by  Dennis 850GLT on  Sat Jan 24 02:04 CST 2004
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Sat Aug 13 08:42 CST 2011
    [RELATED]


    There is a vacuum hose at the top front of the engine that sneaks under the fuel rail. At the top end, there's an elbow that rots out pretty quickly, letting false air into the hose. This can trigger O2 sensors problems.
    WAIT, there's another. Lean over the engine on the driver's side and from the top of the engine (almost right under the top engine brace) there's another identical elbow that is probably rotted out. Go to the Volvo place and purchase both elbows , install them, clear your codes and you just might find the O2 problem gone.


    --
    Dennis







<< < > >>



©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.