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Old 05-14-2017, 10:00 AM   #1
jgdisco2
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Default 06 lr3 trouble codes

hey guys, drove the LR3(141K) to raleigh yesterday and got the CEL. it also stalled on us while in idle and intermittently runs a little rougher than normal.
here are the codes
P0175
p0174
p0101
p0171
p0172

those are all lean or rich codes and then a mass air flow sensor. should i just try cleaning the MAF or is it dying and needs replaced? anyone had all these codes grouped together?
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Old 05-14-2017, 01:36 PM   #2
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Default Re: 06 lr3 trouble codes

Those are lean and rich codes which is odd to have at the same time. Usually P0101 is set because of the throttle body being dirty. I would start with cleaning that, as well as running some BG44k or other injector cleaner through the fuel system. MAFS failures aren't super common, but it can happen. I have definitely seen a dirty throttle body cause stalling.
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Old 05-15-2017, 11:22 PM   #3
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Default Re: 06 lr3 trouble codes

I cleaned my throttle body a month or so ago. It made a world of difference in idle quality and throttle response. Before I cleaned it, it would surge in park and the would kind of lunge when taking off from a stop. That's all better now.

Today I ran a can of BG 210 and then dumped some BG44K in the tank. Throttle response is even better. (or so I think... it could be placebo I guess). I did reset the trip computer and on my test drive I was getting 22MPG. (I expect that to go down with some stop and go on the way to work tomorrow).

The MAF on these is the same as a bunch of Toyotas.
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Old 05-16-2017, 07:44 PM   #4
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Default Re: 06 lr3 trouble codes

I think once you get a fuel trim fault with the light on, you need to reset the adaptions.

Here's a good example of what I'm talking about. I lift the dipstick up out of the tube so oil doesn't back up in the valve cover when I'm filling it. If I forget to push that thing back down it will flag a lean fault. If I just clear the codes the car will go less than a mile and the light will be back on again. Even though I have fixed the vacuum leak by pushing the dipstick back into the tube. I have to reset the adaptions to make the code stop being flagged.
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Old 05-16-2017, 09:32 PM   #5
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Default Re: 06 lr3 trouble codes

Quote:
Originally Posted by discostew View Post
I think once you get a fuel trim fault with the light on, you need to reset the adaptions.

Here's a good example of what I'm talking about. I lift the dipstick up out of the tube so oil doesn't back up in the valve cover when I'm filling it. If I forget to push that thing back down it will flag a lean fault. If I just clear the codes the car will go less than a mile and the light will be back on again. Even though I have fixed the vacuum leak by pushing the dipstick back into the tube. I have to reset the adaptions to make the code stop being flagged.
But also for that at-home mechanic, the lean faults should eventually clear themselves if it has actually been fixed.
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Old 05-16-2017, 09:43 PM   #6
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Default Re: 06 lr3 trouble codes

I have an occasional lean code. I suspect it was due to some shitty gas on my Utah trip. How do I reset adaptations?
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Old 05-17-2017, 07:22 PM   #7
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Default Re: 06 lr3 trouble codes

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I have an occasional lean code. I suspect it was due to some shitty gas on my Utah trip. How do I reset adaptations?
You will need a scan tool that is more advanced than a standard OBDII reader.
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Old 05-17-2017, 09:44 PM   #8
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Default Re: 06 lr3 trouble codes

Quote:
Originally Posted by jymmiejamz View Post
You will need a scan tool that is more advanced than a standard OBDII reader.
Do you think a hard reset would reset the adaptions? I can't remember for sure but I think it does on the LR3 with the 4.4 Jag engine.
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Old 05-17-2017, 09:57 PM   #9
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Default Re: 06 lr3 trouble codes

Quote:
Originally Posted by jgdisco2 View Post
hey guys, drove the LR3(141K) to raleigh yesterday and got the CEL. it also stalled on us while in idle and intermittently runs a little rougher than normal.
here are the codes
P0175
p0174
p0101
p0171
p0172

those are all lean or rich codes and then a mass air flow sensor. should i just try cleaning the MAF or is it dying and needs replaced? anyone had all these codes grouped together?
If you clear the codes out of this thing and again get both lean and rich faults stored that would be really odd. I would smoke test it for leaks and flush the injectors. You could run some BG 44K thru the tank to clean them slowly and cheaper. The lean faults we see all the time, its the rich faults added in that make no sense. Maybe check the voltage drop across the ground circuit. Like from Battery neg post to the block while someone cranks it. Pull the fuel pump fuse and wait for it to stall,then have someone crank it while you measure the voltage drop from neg post to the block. It should be less than .3 of a volt. If you have 1 volt of drop it's way to much. I've been seeing them with 3 or more volts of drop lately. You have a ground strap in the right front wheel well that goes from body to frame to engine. That guy rots out and usually causes a no crank at times. But I see it cause a lot of strange shit.
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Old 05-18-2017, 10:00 PM   #10
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Default Re: 06 lr3 trouble codes

Thanks guys, hopefully getting a chance to work on it beginning of next week. I will report the findings
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Old 05-24-2017, 10:15 AM   #11
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Default Re: 06 lr3 trouble codes

Update: ran a can of bg 44 through the truck, maf cleaned as well as throttle body. CEL came back on after 30 or so miles. Codes are lean now P0171, P0174. Both banks are lean now. Intake gasket my next questionable possibility? Oxygen sensor?
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Old 05-24-2017, 11:06 AM   #12
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Default Re: 06 lr3 trouble codes

Did you reset the adaptations?
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Old 05-24-2017, 11:15 AM   #13
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Default Re: 06 lr3 trouble codes

No I don't have the scan tool to do that
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Old 05-29-2017, 04:28 PM   #14
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Default Re: 06 lr3 trouble codes

P0101, P0172, P01075 have shown back up. Running really rough at low speed and idle, feels like it's "coughing" and isn't very responsive.
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Old 05-29-2017, 06:12 PM   #15
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Default Re: 06 lr3 trouble codes

It is interesting that you get a P0101 after cleaning the throttle body, I've never seen that fault caused by anything else. Maybe you do in fact have a bad mass air flow sensor.
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Old 06-05-2017, 06:41 PM   #16
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Default Re: 06 lr3 trouble codes

Could a P2098 also be the adaptive values or is it usually something else, like a bad cat?

I was getting a lean code or something from one of the upstream O2 sensors, and I think it was from someone welding in a cat and damaging the sensor. I replaced the sensors (all 4) and now the only code I get is P2098.
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Old 06-05-2017, 07:13 PM   #17
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Default Re: 06 lr3 trouble codes

Update 2: installed a new MAF sensor and all has been well so far, instant improvement
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