3117 CEL troubleshooting
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Joined: Jun 2012
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2008 GL320CDI (310k), 2017 GLS450 (170k), 2024 Sprinter 2500 (40k)
3117 CEL troubleshooting
Hello. I got a 3117-001 code about a week after changing old K&N filters with the new set (same brand). Code description is: "Check component Mass air flow sensor. Right Offset drift." Engine runs fine. Fuel economy did not change.
Troubleshooting steps I took so far: Visually inspected the right filter and both sensors. Cleaned the sensors. Swapped the sensors from left to right. Installed spare sensors. The CEL comes back immediately after a code erase. Component test does not reveal that anything is wrong with the sensors.
What else can anyone recommend I do?
Thank you.
Troubleshooting steps I took so far: Visually inspected the right filter and both sensors. Cleaned the sensors. Swapped the sensors from left to right. Installed spare sensors. The CEL comes back immediately after a code erase. Component test does not reveal that anything is wrong with the sensors.
What else can anyone recommend I do?
Thank you.
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NGL450 w/EORP, S550
if you have a proper Das like scan tool you can perhaps try an air filter adaptation and see if this can be recovered without swapping map, mass meter and air temp sensors.
Thread Starter
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2008 GL320CDI (310k), 2017 GLS450 (170k), 2024 Sprinter 2500 (40k)
too right, paper Mann filters are what the ecu is calibrated to suck through. Not heavy K&N which even if lightly oiled will ruin every sensor downstream of it.
if you have a proper Das like scan tool you can perhaps try an air filter adaptation and see if this can be recovered without swapping map, mass meter and air temp sensors.
if you have a proper Das like scan tool you can perhaps try an air filter adaptation and see if this can be recovered without swapping map, mass meter and air temp sensors.
Thread Starter
Senior Member
Joined: Jun 2012
Posts: 409
Likes: 22
2008 GL320CDI (310k), 2017 GLS450 (170k), 2024 Sprinter 2500 (40k)
Thread Starter
Senior Member
Joined: Jun 2012
Posts: 409
Likes: 22
2008 GL320CDI (310k), 2017 GLS450 (170k), 2024 Sprinter 2500 (40k)
The issue was resolved by performing two steps. Installed old/spare sensors and resetting HFM drift compensation. I have a suspicion that there is nothing wrong with my sensors and I just needed to to reset both, filters and HFM. Once I verify my theory I will update this thread.
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MBWorld Fanatic!
Joined: Jan 2010
Posts: 3,128
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NGL450 w/EORP, S550
The issue was resolved by performing two steps. Installed old/spare sensors and resetting HFM drift compensation. I have a suspicion that there is nothing wrong with my sensors and I just needed to to reset both, filters and HFM. Once I verify my theory I will update this thread.
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Thread Starter
Senior Member
Joined: Jun 2012
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2008 GL320CDI (310k), 2017 GLS450 (170k), 2024 Sprinter 2500 (40k)
It’s more than a theory at this point - it’s what the WiS manual says… Every time you change an air filter you do an ME9.7 (iirc) intake adaptation to recalibrate the sensors to the new pressure map caused by a clean filter. The ECU automatically adapts and scales for changing pressure map as the filters clog and become more restrictive. Now all of that is out the window if the sensors are even lightly fouled by oil contained in a K&N filter and passed through the downstream components. Hopefully this is not the case!
I also just found this: https://workshop-manuals.com/mercede...s_set/page_89/
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NGL450 w/EORP, S550
OK. Now that the diesel cat is out of the bag, disregard everything I said. Your turbos are slinging enough oil around in that intake piping and the EGR is adding to that so much heat to create coke that a lightly oiled K&N filter amounts to a mouse fart in a storm of badness.
you don’t have a way to interrogate 9.7 Motor Electronics, because compression ignition.
you don’t have a way to interrogate 9.7 Motor Electronics, because compression ignition.
Last edited by Max Blast; Aug 3, 2022 at 08:25 PM.
