Code P0171 and P0174 set same time.
Thread Starter
|
Junior Member
Joined: Nov 2011
Posts: 265
Code P0171 and P0174 set same time.
I have a 2005 Jimmy 2 door. Check engine light came on so used my cheapo scanner and codes P0171 and P0174 set same time. I was reading the forumns and was trying to figure out what to start first and lean towards.
1.) Both O2 sensors went bad same time
2.) Vacuum leak
3.) fuel pump problem
4.) fuel injector problem
Some background on recent repairs in the last year. New catylic converter gm replacement, all 3 O2 sensors ac delco, new delco plugs, new cap and rotor, new air filter.
1.) Both O2 sensors went bad same time
2.) Vacuum leak
3.) fuel pump problem
4.) fuel injector problem
Some background on recent repairs in the last year. New catylic converter gm replacement, all 3 O2 sensors ac delco, new delco plugs, new cap and rotor, new air filter.
Moderator
Joined: Mar 2009
Posts: 8,453
From: Belleville, Michigan
Check both sides of each fuse in the underhood fuse panel with the engine running: DVOM or a test light, doesn't matter. Specifically looking for a bad oxygen sensor fuse. Possibly one of the sensors shorted out. Then check fuel pressure and leakdown.
Thread
Thread Starter
Forum
Replies
Last Post
BlazinClint
2nd Generation S-series (1995-2005) Tech
4
Jan 28, 2016 12:54 PM
Bolbol
2nd Generation S-series (1995-2005) Tech
7
Mar 29, 2015 12:35 PM
