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2015 E class P22AA Heater NOx sensor consipracy ?

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Botus, Jan 13, 2020.

  1. Botus

    Botus Senior Member

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    There’s a brilliant free mag that you can pick up in some parts factors... it’s called “professional motor mechanic”. Mostly has articles on new parts suppliers, updates and improvements to existing stuff and info on new ranges of spares coming to the market re complex systems that are becoming more and more popular.

    The other bit it does is have a deep dive into to the odd nasty surprise tripping up many garages. Often covers weird electrical faults. I remember one about Seat with a misfire and it was a failing ECU the diagnostics couldn’t pick up.

    Anyway back to Mercedes.... Now thinking as I write this.... it sounds very much like the article is trying to highlight Mercedes now deliberately build in fake faults that will get you an MOT failure. Yet outside the dealer network it will never get fixed and is only there to discredit independent garages and push an owner back in to the main dealership network. Funny that, as writing this I remember a guy at work having the VERY same issue impact a Vauxhall Mokka’s and CAT sensor faults no one can resolve....

    The mag doesn’t quite say its deliberate fake faults being engineered into cars. But the fix is a great example of how your ave indy is never going to know about or be able to resolve. You get a real fault code on diagnostics, you can measure a real fault with the offending sensor and you can buy a genuine new sensor and correctly replace it. But still have the same issue ongoing.

    On the E class 2015 EML light comes on but the car drives OK, however diagnostic show P22AA heater circuit failure on the CAT sensor . The article goes on to say Merc have never even released a TIPS document re the issue and the part man will ALWAYS sell you the wrong spare part.

    The first part of the fix is to retrofit "special equipment code 30o" via online dealer tools. This updates the vehicle record so the parts EPC will now sell you the correct “updated spares”, you then replace both CAT sensors, reset adaptions on the SCR, then need to flash the Engine, Gearbox and Selective Catalytic Reduction (SCR) modules and clear stored codes.

    Funny as I write more points come to the fore about conspiracies... Recently we've had a sudden recall to flash many Merc ECU because "the EML light might come on". I suspect the EU got wind of the fun above.... and instead of buying two CAT sensors and giving Mercedes 500 quid... they've been told to take the trick out of the system "NOW !"
     
  2. LostKiwi

    LostKiwi Senior Member

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    For a conspiracy to work it has to be limited to a small number of people and they have to have something to lose in order to keep quiet.
    The more people involved, the harder to keep under wraps. The less people have to lose the more likely it will come out.
    That sounds like it fails on both counts.
     
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  3. NBurns

    NBurns Senior Member

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    So the same difference as being a 'Sun newspaper' reader having loads of rubbish chucked in and a 'Telegraph' or 'Times' reader and thus having more accurate facts on the subject? Personally I prefer the broadsheet's accurate information.



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  4. OP
    Botus

    Botus Senior Member

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    of course its all in my head

    Service Campaign 2019040001 APR19 – 2012-2014 117, 166, 172, 204, 207, 212, 216, 218, 221, 222, 231, 251, 463 ECU Malfunction Indicator Light displayed while no fault is present in the control unit, dealer will update ECU software. Approximately 210,440 vehicles are affected.
     
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  5. NBurns

    NBurns Senior Member

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  6. LostKiwi

    LostKiwi Senior Member

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    That's not the same thing.
    That's a recall for a fault when there isn't one as opposed to anything to do with NOx sensors as you claimed above.
     
  7. bembo449

    bembo449 Senior Member

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    I think the VW scandal reveals They are more than capable of building these sort of things into the software on a car
     
  8. star

    star Forum Supporter Authorised Forum Supporter

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    Indies with online star can do all of this, even get the data card updated for new Nox sensors, then carry out software update.
     
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  9. OP
    Botus

    Botus Senior Member

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    ... a bit of a difference between a paid for version of dealer kit by 4 or 5 countrywide independant specialists and most garages... and the fact they deliberately never issued a TIPS documenting this issue?

    I see there's another issue on these cars with outside temp errors and engine ECU issues, USA get extended warranty to 10 years 120k miles

    various Model Year ("MY") 2014 - 2018 Mercedes-Benz vehicles, the engine control unit (ECU) software may not meet current specifications. In certain circumstances when the vehicles are parked for a long duration, an erroneous activation of the "Check Engine Lamp" for the outside temperature sensor might occur. In our continuing efforts to assure the proper performance of Mercedes-Benz products and to ensure the satisfaction of our customers, the warranty for the ECU software in the subject vehicles has been extended from the original 4 years/50,000 miles to 10 years/120,000 miles.

    Faults on diagnostics

    Motor Electronics (ME) N3/10 P007128 (for M274/276LA engine) – Ambient Air Temperature Sensor Circuit "A’ Range/Performance signal bias level out of range/zero adjustment failure
    or
    ME N3/10 P007028 (for M270 engine) – Ambient Air Temperature Sensor Circuit "A’ signal bias level out of range/zero adjustment failure

    odd I thought I'd read the issue was hardware not software... along the lines temp input to ECU and corrosion on the circuit board destroying it...
     
    Last edited: Jan 17, 2020
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