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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

lh 3.1 code 2-1-2 200 1991

posted by  JimSig on  Thu Mar 25 16:39 CST 2010
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Mar 28 17:24 CST 2014
[RELATED]

91 244 with lh 3.1 - I keep getting a code 2-1-2 (missing/faulty heated o2 sensor signal). I replaced the old sensor with a bosch 13953 spliced into the existing wires but the code still comes back. Car runs very rich and stumbles, idles poorly.

Probing between the still connected single wire connection and ground gives a steady/unchanging reading of .54v

Disconnected the two heater wires and checked for the voltage being supplied to the heater - only got a reading of .02 volts I am assuming it should be getting a constant 12v . Where does the power supply for the heater circuit come from - I assume the ecu? If so what pins - want to work back and find if its a broken wire. The tip of the old sensor was black and sooty so I assume it was not heating up either.

Also, could I just connect the heater wires to a good, ignition switched, 12v power source or does the ecu look for a completed heater circuit?

Thanks for any ideas!

Jim






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.