• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech

Code advice needed.

  • Thread starter Thread starter Down
  • Start date Start date Aug 1, 2004

Down

Founding Member
Mar 20, 2002
309
0
0
Overland Park, KS
Aug 1, 2004
#1
  • Aug 1, 2004
  • #1
Ugh, Ima bout ta give up

My car's been having an intermittent hesitation/buck. It comes and it goes. I'm actually just now getting on the ball about fixing it (been setting in garage since Mar. or so, I bought it in Oct.)

Ran codes and got this-
543
Continuous memory codes
176
542
543

I'm doin' a buncha lil knick knack stuff now, even if it may not need it this moment (new plugs/wires/cap/rotor/ACT/ECT)

176- I would write this code off to my long tubes, but last fall I pulled a 176 AND a 177. So that left bank has been throwing codes for awhile, never had one for the other side. I plan on new O2's.

I am thinking about changing the fuel pump. I already have a new 255 that I'd picked up for my now postponed blower project. Might as well put it to use, even if I pulled no codes that necessarily suggest a bad pump.

The 542/543 was didn't concern me much (I'd always heard they were common, "ghost codes") until I read this- http://forums.stangnet.com/showthread.php?t=477626&highlight=542

I'm a simple cave man, that walkthrough fascinates and frightens this simple mind. Christ, it's gonna take me a couple hours to change plugs and wires.

Any thoughts? I know I didn't ask any specific questions, but I'd love to hear any opinions you may have.

Thanks,

J
 

mo_dingo

20+ Year Stangneter
Aug 26, 2003
3,031
2
58
Tucson, AZ
Aug 1, 2004
#2
  • Aug 1, 2004
  • #2
176 - Seeing as you are not getting a code for the right side as well, your left side O2 may be bad.

Check the plugs on both sides of the motor (sucks, but free). If the left side plugs are white, but the right side is brown, then sounds like a bad left side O2 sensor.

Also, test the resistance for both o2 sensors, as outlined in Rockin_rick's thread.

Report back and let us know what happens.
Scott
 
You must log in or register to reply here.

Similar threads

R
Misfire at high rpm! Help
  • Ryanm2018gt
  • Jan 2, 2026
  • 2015 - 2023 (S550) Mustang -General/Talk
Replies
9
Views
880
2015 - 2023 (S550) Mustang -General/Talk Jan 17, 2026
highplace11
H
G
Persistent P0102 and limp mode
  • Godless
  • Oct 30, 2025
  • 2005 - 2009 Specific Tech
Replies
2
Views
203
2005 - 2009 Specific Tech Nov 11, 2025
Godless
G
R
94’ SN95 - Intermittent lope & bogging at moderate rpm
  • Red5.0ho
  • Nov 2, 2025
  • 1994 - 1995 Specific Tech
Replies
5
Views
383
1994 - 1995 Specific Tech Nov 3, 2025
General karthief
S
Fuel ‘88 GT Runs Rich Cold — Fixes Itself When I Unplug Sensors (ECT, MAF, O2, etc.)
  • Sufarry
  • Nov 6, 2025
  • Fox 5.0 Mustang Tech
Replies
12
Views
706
Fox 5.0 Mustang Tech Nov 9, 2025
Mustang5L5
G
Sputtering/misfiring below 2500rpm
  • Godless
  • Sep 14, 2025
  • 2005 - 2014 S-197 Mustang -General/Talk-
Replies
5
Views
330
2005 - 2014 S-197 Mustang -General/Talk- Sep 14, 2025
gkomo
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?