Have code P1151 need help
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Well drat, I guess it was too much to expect the fix to be that straight forward.
The computer isn't happy with bank two air/fuel ratio for some reason.
Again the fuel trim isn't showing a real imbalance between banks 1 & 2.
Will your device read the O2 sensors output???? If so, post their numbers & watch their switching speed, it should be fast & averaging around about 0.6 vots.
The computer isn't happy with bank two air/fuel ratio for some reason.
Again the fuel trim isn't showing a real imbalance between banks 1 & 2.
Will your device read the O2 sensors output???? If so, post their numbers & watch their switching speed, it should be fast & averaging around about 0.6 vots.
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Ok good feedback.
If the passenger side O2 sensor has more than 75-100K miles on it, I'd seriously consider replacing it too, as they're normally replaced in pairs, as with age they get slow/lazy to sense/switch/feedback to the computer & it would like a balanced O2 sensor feedback from both cyl banks.
If you do decide to replace the passenger side O2 sensor, pull the battery B- cable before starting the job, to wipe the computers KAM, so it'll begin to build new fuel trim tables with the new O2 sensors input.
You might want to do the cold & warm idle computer relearn routene too, to avoid idle or driveability problems.
More thoughts for consideration.
If the passenger side O2 sensor has more than 75-100K miles on it, I'd seriously consider replacing it too, as they're normally replaced in pairs, as with age they get slow/lazy to sense/switch/feedback to the computer & it would like a balanced O2 sensor feedback from both cyl banks.
If you do decide to replace the passenger side O2 sensor, pull the battery B- cable before starting the job, to wipe the computers KAM, so it'll begin to build new fuel trim tables with the new O2 sensors input.
You might want to do the cold & warm idle computer relearn routene too, to avoid idle or driveability problems.
More thoughts for consideration.
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
A search turned this up.
Ford Truck Enthusiasts Forums - View Single Post - Again, P0401 and P1443 on a different motor
Ford Truck Enthusiasts Forums - View Single Post - Again, P0401 and P1443 on a different motor
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