Code P1151 Need Help with Diagnosis - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 14 (permalink) Old 08-11-2019, 05:24 PM Thread Starter
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Code P1151 Need Help with Diagnosis

Vehicle:
2000 Mercury Sable
3.0 Liter Duratec 24V DOHC


Throughout the past few years I've done a lot of maintenance work. I include this information because that includes replacing old vacuum lines / coolant lines either as they failed or just going to the part store parking lot and swapping out old lines one at a time. Much easier than dealing with intermittent failures. Now, on to my problem.


I'm getting a code P1151. I've had it for a while, and the car is driving fine, but I would like to correct the issue. This seems to be an oxygen sensor lean code on bank 2. I would like to perform the following, and am unsure of the procedure in some cases, or the values I need in others.


Is it mentioned which HO2S sensor this is from the code?


Where is this sensor / both sensors located?


At this point, I am going to examine the wiring harnesses and the wiring for visual signs of defect, and I will repair if necessary. When doing this, can I take a reading across the pins and what value should I expect?


What should I look for next? It is quite likely that the sensor went bad, and I may need to replace it, but I would like to test and confirm if possible. Is there a procedure for this?


If I have to replace the sensor, I've heard they can be a PITA to remove. Are there any tricks for this?


Thanks for the info all!
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post #2 of 14 (permalink) Old 08-15-2019, 03:55 PM Thread Starter
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It has been a few days. Just a bump, hoping someone can help me get started, or perhaps rephrase the question.
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post #3 of 14 (permalink) Old 08-15-2019, 09:24 PM
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The sensor the code is referencing is the bank 2 (front/radiator) sensor 1 (upstream/pre-cat o2 sensor with a green elec. plug. It can be r&r'd with a 7/8" (22mm) combo wrench, o2 sensor socket or a crowfoot socket. It's the easiest of the 4 o2 sensors to access. I would 1st check its wiring/elec. conn. You may have an unfound vacuum leak causing that code. By the way, welcome from KCK!
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post #4 of 14 (permalink) Old 08-15-2019, 09:40 PM
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You really need to look at long term fuel trims to see if you have a vacuum leak before swapping the O2 sensor which is probably not bad.
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post #5 of 14 (permalink) Old Yesterday, 08:58 AM
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^^^^ Agreed. Likely cause is a large vac leak. LTFTs that are high positive at idle and drop toward lower numbers with the engine under load means vac leak.
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post #6 of 14 (permalink) Old Today, 12:06 PM Thread Starter
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Quote:
Originally Posted by sheila View Post
The sensor the code is referencing is the bank 2 (front/radiator) sensor 1 (upstream/pre-cat o2 sensor with a green elec. plug. It can be r&r'd with a 7/8" (22mm) combo wrench, o2 sensor socket or a crowfoot socket. It's the easiest of the 4 o2 sensors to access. I would 1st check its wiring/elec. conn. You may have an unfound vacuum leak causing that code. By the way, welcome from KCK!

Hey, thanks for the welcome! You are only a couple hours away from me. Now, for these sensors, is there any diagram that shows the location of the 4? I have not been successful as far as finding them. I think there is one mounted in the exhaust below the oil filter underneath the front. Would this be the sensor?


Quote:
Originally Posted by Automender12345 View Post
You really need to look at long term fuel trims to see if you have a vacuum leak before swapping the O2 sensor which is probably not bad.
Quote:
Originally Posted by Jeff K View Post
^^^^ Agreed. Likely cause is a large vac leak. LTFTs that are high positive at idle and drop toward lower numbers with the engine under load means vac leak.

Okay, so I'm willing to do this, but my code reader doesn't read fuel trims like that. Is there a cost-effective device that will do this? Otherwise, is there a way to test that specific sensor? I do have a couple meters, a loop calibrator and an oscilloscope that are capable of reading / simulating the sensor value. Is this a voltage or a current signal from the sensor?


I currently have an Actron CP9575 but I'm pretty sure it can't record fuel trims.


Also, could you please give a concrete example of what I would be looking for with fuel trims? As I understand this, I will let it idle and see what the fuel trim is, then take it out on the highway, and record the fuel trim, then report the results back here for an analysis.

Last edited by magic_ninja; Today at 12:16 PM.
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post #7 of 14 (permalink) Old Today, 02:48 PM
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Forscan. Free download for PC and pick up a LM327 for around $25 from Amazon. You will be amazed everything Forscan can do!!

Yes on the fuel trims. Be sure to get the info for both banks.

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post #8 of 14 (permalink) Old Today, 03:13 PM
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^ ELM327. No need for a highway run. Note the fuel trims at idle, then depress and hold the accelerator to ~2500 rpm and read. With hood open, look behind and possibly to the right of the hood latch for a green plastic elec. conn. (plug). This will be the B2S1 o2 sensor. Fwiw, the 2 upstream (pre-cat) o2 sensors have green plugs and the 2 downstream (post-cat) o2's have blue plugs.

Last edited by sheila; Today at 03:29 PM.
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post #9 of 14 (permalink) Old Today, 04:02 PM Thread Starter
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Quote:
Originally Posted by Jeff K View Post
Forscan. Free download for PC and pick up a LM327 for around $25 from Amazon. You will be amazed everything Forscan can do!!

Yes on the fuel trims. Be sure to get the info for both banks.
Quote:
Originally Posted by sheila View Post
^ ELM327. No need for a highway run. Note the fuel trims at idle, then depress and hold the accelerator to ~2500 rpm and read. With hood open, look behind and possibly to the right of the hood latch for a green plastic elec. conn. (plug). This will be the B2S1 o2 sensor. Fwiw, the 2 upstream (pre-cat) o2 sensors have green plugs and the 2 downstream (post-cat) o2's have blue plugs.

Thanks for the info on Forscan. For now, turns out my scan tool can actually read the trims. I've uploaded a pic (-3.1) of where they are at idle, and the other is with the engine under load.
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post #10 of 14 (permalink) Old Today, 09:05 PM
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I am thinking fuel trims don't look that bad but see what others think. You air intake temp is 61 degrees on one shot and 81 degrees on other. Were they done at the same time.
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