SE: Engine light issue W12
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AudiWorld Junior Member
Joined: Feb 2022
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SE: Engine light issue W12
2005 W12. 170.000km Engine light came up one day.
Car runs great no issues,
error codes.
P1151 bank1 mixture adaption range 1:Lean limit not reached.
P1089 bank2 mixture adaption range 1:Lean limit not reached.
i tried delete the error codes But the engine light came up after approx 200km.
any ideas what the issue can be? I have tried to search But didnt find much info regarding this isseue.
Car runs great no issues,
error codes.
P1151 bank1 mixture adaption range 1:Lean limit not reached.
P1089 bank2 mixture adaption range 1:Lean limit not reached.
i tried delete the error codes But the engine light came up after approx 200km.
any ideas what the issue can be? I have tried to search But didnt find much info regarding this isseue.
AudiWorld Member
Joined: Apr 2022
Posts: 144
Likes: 1
From: Espain
2005 W12. 170.000km Engine light came up one day.
Car runs great no issues,
error codes.
P1151 bank1 mixture adaption range 1:Lean limit not reached.
P1089 bank2 mixture adaption range 1:Lean limit not reached.
i tried delete the error codes But the engine light came up after approx 200km.
any ideas what the issue can be? I have tried to search But didnt find much info regarding this isseue.
Car runs great no issues,
error codes.
P1151 bank1 mixture adaption range 1:Lean limit not reached.
P1089 bank2 mixture adaption range 1:Lean limit not reached.
i tried delete the error codes But the engine light came up after approx 200km.
any ideas what the issue can be? I have tried to search But didnt find much info regarding this isseue.
Thread Starter
AudiWorld Junior Member
Joined: Feb 2022
Posts: 26
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second time i used the VCDS But seems to put out same codes..?
i swapped the air filter recently.
AudiWorld Super User
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From: SF Bay Area, CA
W12 has oil filter at far bottom of oil pan area and is accessed solely underneath. So, this is not relevant. Sounds like maybe 4.2?
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Joined: Oct 2001
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From: SF Bay Area, CA
Meantime, Bank 1 and Bank 2 together constitute the whole left side of the W12 as you look at it underhood. USA or Continental Europe passenger side of car. Given lean codes generally, likely a vacuum leak. Look critically at the infernal clamp at base of the rubber intake hose right at top of air box on that side. More so since you reference the air filter work. Really bad design and incredibly finicky to get back on properly. If it is slightly dislodged, you will have an air leak after MAF (which is in top of air box) and then lean codes can result. Since leak is showing across both Bank 1 (front 3 cylinders) and Bank 2, that's also why I am thinking it is something before the intake starts to branch down to individual cylinders, or something connected to O2 sensors that are also in those groups of three for each Bank. Obviously check other end of same hose too--where it is clamped to throttle body on that side of motor. But that clamp end is much harder to mess up.
Last edited by MP4.2+6.0; May 9, 2022 at 11:59 AM.
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Thread Starter
AudiWorld Junior Member
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Be sure to look at ECU 2 for codes too.
Meantime, Bank 1 and Bank 2 together constitute the whole left side of the W12 as you look at it underhood. USA or Continental Europe passenger side of car. Given lean codes generally, likely a vacuum leak. Look critically at the infernal clamp at base of the rubber intake hose right at top of air box on that side. More so since you reference the air filter work. Really bad design and incredibly finicky to get back on properly. If it is slightly dislodged, you will have an air leak after MAF (which is in top of air box) and then lean codes can result. Since leak is showing across both Bank 1 (front 3 cylinders) and Bank 2, that's also why I am thinking it is something before the intake starts to branch down to individual cylinders, or something connected to O2 sensors that are also in those groups of three for each Bank. Obviously check other end of same hose too--where it is clamped to throttle body on that side of motor. But that clamp end is much harder to mess up.
Meantime, Bank 1 and Bank 2 together constitute the whole left side of the W12 as you look at it underhood. USA or Continental Europe passenger side of car. Given lean codes generally, likely a vacuum leak. Look critically at the infernal clamp at base of the rubber intake hose right at top of air box on that side. More so since you reference the air filter work. Really bad design and incredibly finicky to get back on properly. If it is slightly dislodged, you will have an air leak after MAF (which is in top of air box) and then lean codes can result. Since leak is showing across both Bank 1 (front 3 cylinders) and Bank 2, that's also why I am thinking it is something before the intake starts to branch down to individual cylinders, or something connected to O2 sensors that are also in those groups of three for each Bank. Obviously check other end of same hose too--where it is clamped to throttle body on that side of motor. But that clamp end is much harder to mess up.
but engine light still come on after 1 day of drivning
any other ideas on what the problem could be?
should i try to change the MAF? Doesnt seem to expensive of the ones i found online, But om thinking that the VCDS should have give error codes on MAF IF that was the problem…right?
Last edited by Ashmatic; May 31, 2022 at 12:52 AM.
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