I need some help with a code and I/M Monitors!

Reply Subscribe

Thread Tools

Search this Thread

Feb 7, 2010 | 12:28 PM

docbreece

Thread Starter

New User

Joined: Feb 2010

Posts: 4

Likes: 0

I need some help with a code and I/M Monitors!

This is what I'm pulling out of my 2000 Expy with an Accutron OBDII reader.

Code: P1151 Manufacturer Fuel Air Metering

All my I/M monitors are good except Catalyst Monitor and Evap System Monitor, which say "Inc"

I got a Freeze frame, and this is what I read...

DTC causing: P1151
RPM: 1180
Load value: 71.3%
Coolant Temp: 188F
Short Term Fuel Trim1: 3.1%
Long Term Fuel Trim1: 0.0%
STFT2: 3.1%
LTFT2: 0.0%
STFT3: 61.6%
LTFT3: 57.0%
Veh. Speed: 42 mph
Fuel Sys1: CLSD1
Fuel Sys2: N/A

Any help? I want to see if it could be anything other than the MAF, as it's rather expensive....

Thank you!
Eric

Feb 7, 2010 | 01:07 PM

alloro

Fleet Owner

Joined: Apr 2008

Posts: 24,322

Likes: 5,132

From: 0,0,1

Quote:

Originally Posted by docbreece

Code: P1151 Manufacturer Fuel Air Metering

Check to make sure your oil cap is on tight, the dipstick is in all the way, the PCV valve is seated all the way into it's grommet, and that the PCV hose is undamaged it's entire length.

Feb 7, 2010 | 05:03 PM

pdqford

Logistics Pro

Joined: Jan 2001

Posts: 3,740

Likes: 37

From: Central NYS

Quote:

Originally Posted by docbreece

Any help? I want to see if it could be anything other than the MAF, as it's rather expensive....

Eric, I highly doubt its your MAF, as a problem with the MAF usually effects both banks.

Your P1151 is telling you that the PCM ran a test on your HO2S and the upstream HO2S on Bank 2 (i.e, driver's side) failed the test. It was stuck 'lean' at the end of the test and has not switched from lean to rich for a claibrated amount of time.

This code is keeping the Cat Monitor and the EVAP Monitor from running to completion.

Your HO2S may be dying, or the problem could be in wiring to the HO2S. (Or you may have a fuel issue (pressure, injector, etc). To save some $$, you could try swapping the left and right HO2S and if you then get a P1131, the HO2S is the culprit.

Feb 7, 2010 | 09:38 PM

docbreece

Thread Starter

New User

Joined: Feb 2010

Posts: 4

Likes: 0

Good, good....

Quote:

Originally Posted by pdqford

Your HO2S may be dying, or the problem could be in wiring to the HO2S. (Or you may have a fuel issue (pressure, injector, etc). To save some $$, you could try swapping the left and right HO2S and if you then get a P1131, the HO2S is the culprit.

Thank you. What exactly are you referring to when you say HO2S? I recently replaced the #4 coil pack, and the PCV valve position sensor switch(? I think that's what it was. It was a little black box above the engine on the driver's side, it had two vacuum lines running into it, and an electrical plug.)

Eric

Feb 8, 2010 | 08:47 AM

alloro

Fleet Owner

Joined: Apr 2008

Posts: 24,322

Likes: 5,132

From: 0,0,1

Quote:

Originally Posted by docbreece

What exactly are you referring to when you say HO2S?

Heated Oxygen Sensor

Feb 8, 2010 | 12:35 PM

pdqford

Logistics Pro

Joined: Jan 2001

Posts: 3,740

Likes: 37

From: Central NYS

Quote:

Originally Posted by docbreece

I recently replaced the #4 coil pack, and the PCV valve position sensor switch(? I think that's what it was. It was a little black box above the engine on the driver's side, it had two vacuum lines running into it, and an electrical plug.)

That sounds to me like you replaced the EGR solenoid. It is an electrical (hence, the electrical plug) solenoid controlled by the PCM. When the PCM activates the solenoid, vacuum is passed to the EGR valve to control the EGR valve.

Are you dealing with the 4.6 or 5.4 engine?

Feb 8, 2010 | 01:00 PM

docbreece

Thread Starter

New User

Joined: Feb 2010

Posts: 4

Likes: 0

It's a 4.6. Egr, yes. Egr valve position sensor switch was its name-o.

Every 2026 Ford Engine Explained

Brett Foote

10 Ugly Ford Trucks That We Still Kinda Love

Joe Kucinski

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalyptic 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

Feb 9, 2010 | 07:07 AM

projectSHO89

Hotshot

Joined: Jan 2004

Posts: 19,763

Likes: 1,081

From: St Louis

P1131 and P1151 DTCs are usually (but not always) caused by the upstream O2 sensor for the bank for which the code is posted. In the absense of in-depth troubleshooting, replace the upstream O2 sensor on the driver's side. Bosch, NGK, and Motorcraft are all good. Figure around $50-60 from a local parts store as a typical price.

You replaced the DPFE sensor. Hopefully, you got one from Motorcraft.