t-codes 171 and 174

Reply

  #1  
Old 04-21-04, 05:48 PM
reyes45's Avatar
Member
Thread Starter
Join Date: Mar 2003
Location: Michigan, USA
Posts: 71
Question t-codes 171 and 174

On my 98 sierra, 4.3lt. my check engine went onand it registered codes 171, and 174. What could have coused these codes. Thank you.
 
Sponsored Links
  #2  
Old 04-21-04, 07:17 PM
Member
Join Date: Feb 2004
Location: So Cal
Posts: 248
Both front O2 sensors are seeing a lean condition.

Possible causes:

Lean fuel condition caused by low fuel pressure, restricted fuel filter, clogged fuel injector(s), etc.

Vacuum leak in a hose or intake manifold gasket leak causing the O2 sensor to see a lean condition.

Those are some of the most common reasons.

Check (or get checked) the O2 sensors to make sure they are responding to fuel changes. Easy job for a technician that knows what he's doing.

Matt
 
  #3  
Old 04-22-04, 05:27 PM
reyes45's Avatar
Member
Thread Starter
Join Date: Mar 2003
Location: Michigan, USA
Posts: 71
Smile

thanx matt,
I found that the pcv hose was leaking. I replaced it and erased the codes and they haven`t poped up yet. thanks for your advice.

reyes45
 
  #4  
Old 04-22-04, 09:15 PM
Member
Join Date: Feb 2004
Location: So Cal
Posts: 248
Sounds like you got a good fix on it. Congrats.
 
Reply

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 Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes