Major o2 sensor problem
Thread Starter
|
Senior User
Joined: Mar 2010
Posts: 171
Likes: 0
Major o2 sensor problem
My 98 threw a check engine light the other day and after retrieving the codes I got the usual "lean condition bank 2". Although after hooking up my scan tool, I found that three o2 sensors are not responding. All zeros across the board. I just changed the bank 2 sensor not even 500 miles ago. Im guessing with 3 going out at the same time I have a wiring issue.
Does anyone have a wiring diagram for the o2 sensors on a 98 Expy with the 5.4?
Does anyone have a wiring diagram for the o2 sensors on a 98 Expy with the 5.4?
Fleet Owner
Joined: Apr 2008
Posts: 24,318
Likes: 5,128
From: 0,0,1
FYI, the O2 sensors labels translate as:
#12 = Bank 1, Sensor 2
#22 = Bank 2, Sensor 2
#11 = Bank 1, Sensor 1
#21 = Bank 2, Sensor 1
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
The signal circuits won't generate any voltage until they come up to operating temps. And the heater circuits shut down after a fixed amount of time after startup.
Thread Starter
|
Senior User
Joined: Mar 2010
Posts: 171
Likes: 0
After the cel came on I hooked up my scanner and viewed the real time data and the three dead sensors were at 0.000 volts while the truck was running and warm. The bank one sensor was switching no problem.
My truck has raised fuel mixtures 12.5% and Im guessing thats because of what it perceives to be a lean condition. On a road trip last week I only got 270 miles to a full tank on the expressway.
I need to fix this
My truck has raised fuel mixtures 12.5% and Im guessing thats because of what it perceives to be a lean condition. On a road trip last week I only got 270 miles to a full tank on the expressway.
I need to fix this
Fleet Owner
Joined: Apr 2008
Posts: 24,318
Likes: 5,128
From: 0,0,1
Trending Topics
Fleet Owner
Joined: Apr 2008
Posts: 24,318
Likes: 5,128
From: 0,0,1
One time the wife drove my Mustang through a deep puddle (up to the floor boards) and that caused all 4 O2 sensors to go bad. So just be aware that it is possible something happened to all 4 at once for some reason.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
Fleet Owner
Joined: Apr 2008
Posts: 24,318
Likes: 5,128
From: 0,0,1
I know starting in 1999 you have fuse #23 (15-amp) for the front O2 sensors and fuse #24 (15-amp) for the rear O2 sensors. But for 97 and 98 I think it was different. You can check those 2 fuses just in case.
Thread
Thread Starter
Forum
Replies
Last Post
