Thanks
Code P2422 Check Engine Light still on
Thread Starter
Newbie
Joined: Dec 2020
Posts: 7
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2016 CLS 550
Code P2422 Check Engine Light still on
Have any of you guys ever had a P2422 code continuously come on after changing the Purge Valve and Charcoal Canister? I changed the Purge Valve myself and purchased a new gas cap. Reset the system with my OBDII , Still came on and stated that the EVAP Vent Valve was stuck/closed. Took it to a certified Mercedes Mechanic and their diagnostics stated the same. I had a new one installed, he said that it may come on but needed to be driven at least 100 miles. Can anyone give me any insight. Thanks
Last edited by wgabri01; Dec 18, 2020 at 08:46 AM.
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'11 E350, '11 E550, '98 M3, '95 E320
Quick look in WIS suggests their is a pressure sensor in the fuel tank, used in part to check the system for leaks. Do you hear the purge valve clicking when the car is running? Its PWM to control how much fuel vapor is introduced into the intake system. In conjunction with the purge valve there's a shut-off valve in the charcoal canister. So even if all the switches/valves are working, but there is an obstruction in the EVAP system piping or the tank pressure sensor is giving the wrong data if could flag a CEL.
A good scanner, with bi-directional control will help further diagnosis... can the valves be commanded? do they respond to command? am I getting the "correct" signals? etc... For all we know the purge valve and canister shut-off valve might have been fine.
A good scanner, with bi-directional control will help further diagnosis... can the valves be commanded? do they respond to command? am I getting the "correct" signals? etc... For all we know the purge valve and canister shut-off valve might have been fine.
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2011 E-350 4Matic Sport
They told you drive it for a while because the onboard evap monitor needs to complete a specific drive cycle and successful self test in order for the code to fully clear.
Emissions codes can be a pain because they are in compliance with EPA requirements for reporting and clearing. They essentially require the vehicle to successfully self test the evap system and complete a predetermined mfg-specific drive cycle. The drive cycle can be duplicated by the shop but it can be a pain so they simply tell you to drive it. I would expect the CEL to go off on its own if indeed the repair was successful and the drive cycle is completed without faults.
What they don't want is the ability to clear the code and get the vehicle inspected without repairing the root cause.
Some states allow 1 monitor to be incomplete at inspection, meaning the system is completing a drive cycle but if there's a CEL the vehicle won't pass.
Emissions codes can be a pain because they are in compliance with EPA requirements for reporting and clearing. They essentially require the vehicle to successfully self test the evap system and complete a predetermined mfg-specific drive cycle. The drive cycle can be duplicated by the shop but it can be a pain so they simply tell you to drive it. I would expect the CEL to go off on its own if indeed the repair was successful and the drive cycle is completed without faults.
What they don't want is the ability to clear the code and get the vehicle inspected without repairing the root cause.
Some states allow 1 monitor to be incomplete at inspection, meaning the system is completing a drive cycle but if there's a CEL the vehicle won't pass.
MBWorld Fanatic!
Joined: Jun 2020
Posts: 1,363
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'11 E350, '11 E550, '98 M3, '95 E320
They told you drive it for a while because the onboard evap monitor needs to complete a specific drive cycle and successful self test in order for the code to fully clear.
Emissions codes can be a pain because they are in compliance with EPA requirements for reporting and clearing. They essentially require the vehicle to successfully self test the evap system and complete a predetermined mfg-specific drive cycle. The drive cycle can be duplicated by the shop but it can be a pain so they simply tell you to drive it. I would expect the CEL to go off on its own if indeed the repair was successful and the drive cycle is completed without faults.
What they don't want is the ability to clear the code and get the vehicle inspected without repairing the root cause.
Some states allow 1 monitor to be incomplete at inspection, meaning the system is completing a drive cycle but if there's a CEL the vehicle won't pass.
Emissions codes can be a pain because they are in compliance with EPA requirements for reporting and clearing. They essentially require the vehicle to successfully self test the evap system and complete a predetermined mfg-specific drive cycle. The drive cycle can be duplicated by the shop but it can be a pain so they simply tell you to drive it. I would expect the CEL to go off on its own if indeed the repair was successful and the drive cycle is completed without faults.
What they don't want is the ability to clear the code and get the vehicle inspected without repairing the root cause.
Some states allow 1 monitor to be incomplete at inspection, meaning the system is completing a drive cycle but if there's a CEL the vehicle won't pass.
Never assume.
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Joined: Oct 2014
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2011 E-350 4Matic Sport
Yeah, it can "haunt" you for a while lol.
Suggest that OP get even a basic obd2 scantool like Launch CR319 as an example. It will provide onboard monitor status as well as retrieve codes , live data etc.
Suggest that OP get even a basic obd2 scantool like Launch CR319 as an example. It will provide onboard monitor status as well as retrieve codes , live data etc.
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Thread Starter
Newbie
Joined: Dec 2020
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2016 CLS 550
Great Info. So upon looking at the diagram you provided, it gave me good clarity. I applied my OBDII and it did send an addition code that said Y58/1 (Purge Valve). I ordered an OEM and will replace it. Thanks again
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Joined: Oct 2014
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2011 E-350 4Matic Sport
Here's a good write-up about the I/M (emissions) monitors:
https://www.obdautodoctor.com/scanto...tors-explained
https://www.obdautodoctor.com/scanto...tors-explained
Junior Member
Joined: Feb 2018
Posts: 35
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From: Santa Clarita,Ca
2010 E550 coupe,2005 porsche ca 911,04 subaru outback,94 Harley FXSTC
I had the p2422 code and cleared it after freeing up the evap vent valve and passing 9 monitors . Retest showed pass no codes but the test equiptment the state uses showed the prior code P2422 and they said I need to drive my car for approx 180 miles or 17 start and warm up procedures because it showed mileage when I cleared the code. Even though it does not make CEL light come on and is not showing on my tester. It also passed the drive cycle monitors as well . But failed for the code I just cleared and hasnt come back . I do the road test this week and see what happens with the retest afterwards. I have never seen smog test fail from erased code that has been fixed and drive cycle done and passed all monitors .I have worked as a senior master on gas and diesel vehicles and smog test and repair tech for over thirty years now retired have never had this come up before .They tell you how many miles or restart events it has been since repair .It does not show on your tester.this is a relatively new test procedure set by calif for smog tests.
