Obd1 Trouble Code 176 - Taurus Car Club of America : Ford Taurus Forum
LinkBack Thread Tools
post #1 of 4 (permalink) Old 08-13-2008, 10:10 PM Thread Starter
Join Date: Jul 2007
Location: Dundas MN
Posts: 202
Rep Power: 0
Trader Score: 0 reviews
What I have: 1991 Sable 3.8L

It's not the sensor itself, as I substituted a known good one; code 176 continues to show up in continuous memory.

I tested the ground wire; there is continuity to ground. The sensor connector pins look good.

My desire now is to test the continuity of the "hot" wire that runs between the sensor and the ECM. However, I do not have a schematic for that: can anyone help me identify the corresponding ECM connecter pin?

Am I on the right track... is there anything else I should check?

Regards... Mike

P.S. My fuel economy is horrible. I'm assuming the computer is dumping loads of fuel in an attempt to correct a perceived lean condition.
elgoathead is offline  
Sponsored Links
post #2 of 4 (permalink) Old 08-14-2008, 11:25 AM
Devoted Member
DaveX 3.0's Avatar
Join Date: Oct 2007
Location: Methuen, MA
Chapter: Northeast
Posts: 1,318
Rep Power: 22
Trader Score: 0 reviews
Does the engine run rough at all? Particularly at idle?

Here's some things to check:

An unmetered air leak (any way for air to get in after the MAF).
A Vacuum leak (which is also technically an unmetered air leak).
An exhaust leak before the O2 sensor (oxygen getting into the exhaust leak will pass by the O2 causing a false lean condition).

Those are the most common things that could cause a lean condition, and are fairly easy to check.

Currently driving a 2009 Focus SE Sedan w/5-Speed!

Previous cars:
1997 Geo Prizm
1996 Ford Taurus G

Formerly "Mr. X"
DaveX 3.0 is offline  
post #3 of 4 (permalink) Old 08-14-2008, 01:35 PM
Crazy Devoted Member
shoz123's Avatar
Join Date: Nov 2002
Location: Ashkum, Illinois
Posts: 14,123
Rep Power: 58
Trader Score: 4 reviews
I don't have schematics for the '91s but if you know the color of wire that the O2 sensor feedback signal is then look for this on the PCM connector. Them back probe the connector at that wire and monitor the voltage. It will take a good digital voltmeter but you can read the output easy enough.

Paul Nimz
'10 Red Genesis Coupe
'08 Hyundai Accent
shoz123 is offline  
post #4 of 4 (permalink) Old 08-15-2008, 10:08 PM Thread Starter
Join Date: Jul 2007
Location: Dundas MN
Posts: 202
Rep Power: 0
Trader Score: 0 reviews
Thanks for the replies.

It evidently was a bad sensor after all. I tried a third one; that seems to have chased the fault code away.

Why they trigger the CEL on this car but not my other car, I don't know.

My fuel economy is still terrible in my opinion; around 13 mpg, mostly stop-and-go city type driving, and I'm a conservative driver.

It is smooth at idle as well as any other speed. Compression is very good, no vacuum leaks were found.

I have observed, however, that in the last couple of days, it seems to be developing what feels like an ignition miss. This occurs after about 3 hrs. of driving. I notice it the most at medium speed when the engine is under load. I suspect a possible weak coil or bad wires (they appear to be original).

I suppose that an occasional ignition miss does not enhance fuel economy, but could it cause it to be as bad as I'm getting? I guess I'll find out.

Regards... Mike

elgoathead is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Taurus Car Club of America : Ford Taurus Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome