Code P0171 and P0174 set same time.
#1
11-19-2012, 07:42 PM
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.
#3
11-27-2012, 06:42 PM
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.
#5
11-30-2012, 05:23 PM
Major vacuum leak, where the breather tube enters the engine the vacuum line seperated, got it all fixed now.
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