It's P1151, I can't figure it out, I have a fuel filter awaiting installation, have put Lucas in the fuel tank, my van runs like a raped ape, it's a 15 passenger with 3.50 gears a microtuner program on the 5.4 and it's laying rubber like never before, what gives. I can't get my tags till I can correct this, I erased the code, drove around and it's back up again. My MPG is a steady 10 city, that's hot rodding it, if I could stay out of it it'd likely go up, which would be impressive. I had to replace my DPFE last year, so I know that isn't it, o2's were done 5 years ago, I did them, previous were clean as a whistle and no codes, I just had the cash and got a deal on them.

Oh what do I do Ford guru.

 

Replace the bad O2 sensor....The rest of the stuff isn't relevant.

 

It's an open for translation type thing tho, the o2 sensors aren't that old.

 

The PCM doesn't seem to be having any problem with translation, only you do.

The age of a part isn't important. The OPERATION of the part, as detected by the PCM, is what is relevant.

 

Just the print out I got and the online description have a list of causes, no out right replace the o2 in writing on them. I'd like to know which side is bank 2 to get the right one as I'm looking down at the 2 of them from behind my engine from inside through the open doghouse of my van.

 

P1151 OBD Trouble Code

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Technical Description

Lack of HO2S-21 Switch, Sensor Indicates Lean
What does that mean?

A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.
Symptoms

You will likely not notice any drivability problems.
Causes

A code P1151 may mean that one or more of the following has happened:
Electrical:

* Short to VPWR in the harness or HO2S
* Water in the harness connector
* Open/shorted HO2S circuit
* Corrosion or poor mating terminals and wiring
* Damaged HO2S
* Damaged PCM

Fuel System:

* Excessive fuel pressure

Leaking/contaminated fuel injectors
Leaking fuel pressure regulator

Low fuel pressure or running out of fuel
Vapor recovery system

Induction System:

* Air leaks after the MAF
* Vacuum Leaks

PCV system:

* Improperly seated engine oil dipstick

EGR System:

* Leaking gasket
* Stuck EGR valve
* Leaking diaphragm or EVR

Base Engine:

* Oil overfill
* Cam Timing
* Cylinder compression
* Exhaust leaks before or near the HO2S(s)

Possible Solutions

* See the above list of causes and go from there.

Sources: MotorCraftService.com

 

Still no answer to which side I need to replace the o2 on.

 

According to above there maybe other causes but that 02 sensor is lh forward of cat.

 

Well I'm going ahead and doing a number of things that need to be done, oil and filter change, fuel filter, clean the MAF if I can find what I did with my can of stuff, the PCV system is junk, never been a good fit before, doubt it's throwing a code now.

 

Bank1 is side with #1 cylinder (passenger side)

 

I replaced the o2 sensor, problem was solved.