Omega Owners Forum
Chat Area => General Car Chat => Topic started by: Jimbob on 01 February 2026, 16:53:14
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Ive got a P010162 code : MAF sensor 1 has a maulfunction. The signal comparision is faulty.
Car is in Limp, EML on and wont clear
W212 OM651 engine
Ive checked all the hoses I can see, had both boost pipes off, HP one was changed last year as it burst.
Can see, or feel, or anyway detect an air leak anywhere. Used light, feel, very basic smoke test (bottle full of smoke near inlet)
Any ideas what next? I fear its an inlet manifold swap which doesnt look huge fun.
Luckily ive a little project car I can drive while I work on this.
Some reports from my Topdon tool - expand professional report section
https://euait.x431.com/Home/Report/reportDetail/diagnose_record_id/2b77a267getZ3bAEDhAEnROMoG/report_type/D/l/en-us (https://euait.x431.com/Home/Report/reportDetail/diagnose_record_id/2b77a267getZ3bAEDhAEnROMoG/report_type/D/l/en-us)
https://euait.x431.com/Home/Report/reportDetail/diagnose_record_id/211a1316getZ3bAEDhAELrDhnR/report_type/D/l/en-us (https://euait.x431.com/Home/Report/reportDetail/diagnose_record_id/211a1316getZ3bAEDhAELrDhnR/report_type/D/l/en-us)
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Has the air intake hoovered up some water?
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Has the air intake hoovered up some water?
Nope, not even been through a big puddle
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DPF diff pressure very low and yet there is a back pressure of over 1 bar?
What state is the EGR?
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DPF diff pressure very low and yet there is a back pressure of over 1 bar?
What state is the EGR?
Untouched in my ownership!
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Fill level of DPF = 180% ? That doesn't sound right, although I know nothing about diags on that car.
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Fill level of DPF = 180% ? That doesn't sound right, although I know nothing about diags on that car.
I beleive ash / soot differences, and full is about 400% but could be wrong
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I can be of no use ;(
My W212 was dealer serviced. My involvement was limited to brakes and tyres.
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If you clear the codes do they instantly return, or only when revved/loaded?
The code is saying the MAF is not seeing the weight of air it expects for the engine operating conditions, that is usually as a result of gas getting in/out when it shouldn't (hence the question about the EGR as if it is clogged/stuck shut then the MAF would expect to see less air, if stuck open, then the MAF would expect to see more air, remembering that on a diesel, MAF is open at idle and closes as boost comes on)
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The code just doesnt delete.
EML goes out when i reset, but comes back next start.
This car hasnt needed much doing to it in reality while ive had it, so blockages building up anywhere are more than possible.
Had a DPF sensor a year or so ago, and that failed charge pipe.
Given that EGR and its cooler needs to come out to get much further, makes sense to look at it first.
Seems to be a commonish fault of Inlet manifolds breaking around a 2nd bolt, having watched vids of both, think egr gubbins counts as a lot of what needs removing to get near it
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Took the EGR cooler off, and can see one end od the EGR now which didnt seem overly dirty. blew it out, but not gone back together yet.
Getting to the other end is challenging.
However, once that was off, I can see the bottom of the inlet manifold, which I beleive should be dry. If grimey indicates a failure, they often crack underneath.
I think this means Ive got to strip down much further and swap that out, not sure thats in my capabilities, will grab a quote too.
(this is the job sped up and made to look easy : https://www.youtube.com/watch?v=6CNoqeqIfLQ or a somewhat less condensed version https://www.youtube.com/watch?v=XsGe9wIb0vw )
Vid and a couple of pics I could manage with a little usb scope camera
https://images.omegaowners.com/images/Jimbob/WIN_20260208_14_54_47_Pro.mp4 (https://images.omegaowners.com/images/Jimbob/WIN_20260208_14_54_47_Pro.mp4)
(https://images.omegaowners.com/images/Jimbob/WIN_20260208_14_54_16_Pro.jpg)
(https://images.omegaowners.com/images/Jimbob/WIN_20260208_14_54_01_Pro.jpg)
(https://images.omegaowners.com/images/Jimbob/WIN_20260208_14_53_45_Pro.jpg)
(https://images.omegaowners.com/images/Jimbob/WIN_20260208_14_53_33_Pro.jpg)
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Had a couple of little goes, but got stuck in today
So, EGR cooler out, EGR out, Ducting and throttle body out, fuel filter housing out, and inlet manifold out.
Hateful job, every bolt out of site, around a corner, new flexible extensions required.
All pretty gunged up, and a coolant weep, and inlet manifold leak spotted.
Next to clean everything up and try and put it back together.
New inlet manifold here and ready, new fuel filter housing on order.
All in all, prob the biggest job I've ever tackled.
Luckily I've the project corsa, which turned out to not be much of a project to use as a daily driver so have the time to do this.
(https://images.omegaowners.com/images/Jimbob/mim_resize.jpg)
(https://images.omegaowners.com/images/Jimbob/mim1_resize.jpg)
(https://images.omegaowners.com/images/Jimbob/mim2_resize.jpg)
(https://images.omegaowners.com/images/Jimbob/mim3_resize.jpg)
(https://images.omegaowners.com/images/Jimbob/mim4_resize.jpg)
(https://images.omegaowners.com/images/Jimbob/mim5_resize.jpg)
(https://images.omegaowners.com/images/Jimbob/mim6_resize.jpg)
(https://images.omegaowners.com/images/Jimbob/mim7_resize.jpg)
(https://images.omegaowners.com/images/Jimbob/mim8_resize.jpg)
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You got further than I did trying to track that intermittently P006A code on hers.
I checked intake pipework to turbo, and pipework to/from intercooler, no obvious leaks anywhere. No telltale signs of cracked manifold either, not that they are prone to cracking on this engine.
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assume you are just living with an intermittant code?
Anyway, all cleaned up, and manifold back on, just 2 more bolts to do up, the awkward ones, but I'm done for today.
Got to wait for parts anyway, so can do those when fresher
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Well done for getting stuck in :y
It should run considerably better all cleaned up as well ;)
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Inlet manifold bolts all done, and Fuel filter housing all sorted.
EGR to wrangle into place, and some more very awkward bolts to do next
Getting there!
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One layer at a time :y
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indeed, not fun, no access.
an hour to do a bolt is frustrating!
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indeed, not fun, no access.
an hour to do a bolt is frustrating!
Ah a 'B-bolt'! ;D
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indeed, not fun, no access.
an hour to do a bolt is frustrating!
Ah a 'B-bolt'! ;D
Lots of B-Bolts!