The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

CAT error code 4-4-3 850 1995

posted by  roger on  Thu Sep 15 19:41 CST 2016
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Sep 12 22:18 CST 2014
[RELATED]

When I get this on my 850 turbo, it has usually meant time to do the O2 sensors, so I agree with you on that diagnosis.

However, I tend to reset (as you did) and wait for reoccurrence.

Your reoccurrence seems to have come a lot sooner than mine did. I think it would go maybe a week or two before it would reoccur. (It takes a while for the ECU to decide that an O2 sensor is lazy, they drift slowly.)

Since yours seems to have come on suddenly, and reoccurs quickly, that makes me think vacuum leak. Something broke or split. I'd look for something like that first, then replace the O2 sensors if a second, close look didn't reveal any leaks.

As you know, they age together. You could replace just one, but the other will follow soon after, so I usually do both together just to minimize the hassle.

Hope this helps!

Roger






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©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.