Hi Guys, Long time lurker and now member,. I am hoping some of you can chime in and help me out on these codes i have on the 2015 GLK 250 Diesel about 173k miles. The car has no boost, im pretty sure its in limp mode. it wont allow me to put the car into manual mode.. If i restart the car it runs ok and lets me go into manual mode for a short period and goes back into limp mode. The car drives fine even in limp i don't notice anything aside from not having WOT. i don't know to much about it as i recently bought it.

P0101FA Mass air flow sensor 1 has a malfunction._
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P245A13 The switchover valve for bypass "Exhaust gas recirculation cooler" has an electrical fault or an open circuit. There is an open circuit.
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P245C11 The switchover valve for bypass "Exhaust gas recirculation cooler" has a shot circuit to ground. There is a short circuit to ground.
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P0101FD Mass air flow sensor 1 has a malfunction._
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P010100 Mass air flow sensor 1 has a malfunction._
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P02EC00 The air mass flow in the intake air system (cylinder bank 1) has a malfunction.
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When i clear them these 2 show up immediately wont clear, Car drives fine till the other code come and it goes into limp mode P245C11 The switchover valve for bypass "Exhaust gas recirculation cooler" has a shot circuit to ground. There is a short circuit to ground.

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P0101FD Mass air flow sensor 1 has a malfunction._

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Any advice is welcomed.

Side note i did check the intercooler hoses, both driver and pass look fine without rips or tears. i have also swapped out the MAF with a spare working one and still same symptoms. Could it be as simple as a dirty air filter??? Doubt it.

 

Sounds like limp mode to me. Can you smoke test the intake system to look for leaks? Focus on things that can make the MAF sensor reading being something other that what the computer wants to see.

 

Did you run intake adaptations after you changed the MAF? You need to.

If the filer looks suspect, replace it at the same time, or run adaptations again after it is replaced.

 

filer? What’s that? How do I run adaptions on a launch handheld? The one I swapped it for is also a used one OEM would I still need to run adaptions? Also with the original MAF it was the same

 

yeah, I just ordered a smoke tester of Amazon which gets here tomorrow. Any suggestions on where I should pull and fill it with smoke? I know to test the turbo I can just go from the MAF tube. But how about the rest of the components? Thanks.

 

What I've done is put smoke nozzle in hose and shoved blue shop towel into opening around it to seal it off. Try to get where you can squeeze the hoses while filled with smoke. Ive seen them crack and not open up/leak till it was under boost and it was leaking where I could not see crack by visual inspection.

 

do you run the check with the engine running to create boost or better with the engine off? also what I’m asking is where is the best place to put the smoke in for both MAF testing and intake testing

 

Id have to be sitting there looking at it for best place to apply smoke. You will need to have engine off. But as you have already figured out the smoke machine won't really pressurize the system hence squeeze hoses while putting smoke to it. It took me awhile to find the crack in the top side of the hose between intercooler and intake on a 98 E300 with the 606 engine.

 

Bump

 

Filter. Sorry, Yes, you have to run adaptations whenever you change anything in the intake. Otherwise, the ECM will see a sudden change and set all sorts of codes.

 

Smoke tested for leaks with car on and car off and found that there are no leaks coming out of anywhere. I’m kind of lost for words here to try and narrow this down. Any advice would be appreciated again like I said there are no leaks anywhere. No smoke is coming out nothing.

 

Check the Air box and found that the air filter was dirty dirtier than I like it. Could this be what’s causing the Matt and the bypass for the EGR here’s a picture thanks guys.

 

See post #3.

 

thanks. I removed the MAF from a friends glk while he had my MAF his was running fine without adaptions and mine with his same codes “ no change” so I don’t believe it’s an adaptation issue rather something else. I will run an adaptation later today however I suspect I will return with same results.

Additionally I did find a small bit of smoke here
wheee the egr intake actuator is. Not sure If it matters. It was really small amount coming out here that lever is.

Not

 

Bump!! Still waiting for access to a scanner that can run adaptations. Any other advice on the egr codes? Open circuit and short to ground isn’t that wiring related???

 

Yes, but the two codes (open and short) should be mutually exclusive. Usually that means there's really something else going on.

 

hi John,

could you explain in a bit more context? Sorry I’m not understanding the “mutually exclusive” sorry you think it could be related to the MAF and it needed adaption? I wish I could know what caused these codes to come. I bough the car like this so I can’t know what caused it to come on.

any idea on what the deal is with this? P02EC00 The air mass flow in the intake air system (cylinder bank 1) has a malfunction.

Where is the location for this sensor or maybe a part number if you know

 

An open circuit is a circuit with a break that prevents current from flowing through the load. A short to ground is a circuit that has the power connected to ground so all the current flows to the ground and not to the load. You could build one that alternates between one case and the other by cutting the power wire and letting it hang where it could randomly touch ground.

The MAF is that blocky thing on the front end of the air filter housing that the air filter connects to.

Your problem sounds a lot like mine. Mine started with a boost problem traced to a split intercooler hose from the IC to the throttle body. I fixed the hose, but by then it had started throwing MAF and EGR codes. After wasting a lot of time and money, I finally took it to a specialist. He replaced the MAF (which we had replaced with an after marked one) and the filter and performed some adaptation magic and it's been fine ever since.

I'm tempted to put the original MAF back and run adaptations and see if it works, but I'm afraid I might just restart the sequence and have to pay him to put his hands on it and bless it again.

 

yeah I’m thinking I may just bring it in. I didn’t want to but I’m staring to rub out of options. I’m just surprised that there aren’t more replies with the 651 owners I’m sure more of us have felt with this.

 

#3 is the solution, together with Air Filter adaptation of you installed a new one and is installed properly.

I don't see any fault code about EGR.
EGR cooler it's another part

 

thanks. Filter is installed “correctly too” here is what I don’t understand. When I took this maf out and put it into my buddies car, it ran perfectly fine without any adaptation so why do I have to run adaptation when I put it in my car that’s what throwing me off and confusing me

can you also please elaborate what you mean about the EGR?

 

Running adaptation after changing the engine air filter, only, seems like nonsense to me.

 

If filter is OK, so only the "adaptation" part is the difference between your friend car and yours.

In your car the Air Filter is monitored by pressure sensor, so your MAF offset is dynamically added in such a way as the air intake should be the same even the filter is almost clogged. Of course this routine comes to an end when the filter is too clogged or when you don't know about this routine and change filter over years without resetting the Air Filter values.

As you can imagine, the offset value remains on wrong math.

P245A13 The switchover valve for bypass "Exhaust gas recirculation cooler"

Translated.. your "EGR" fault code, it was about "EGR Cooler". EGR cooler it's a heat exchanger, a very small radiator intercalated somewhere between EGR and mixing chamber and this has his own actuator with an electric valve, named "switchover valve".
And yes, switchover valve from EGR cooler, has nothing to do with the EGR.
@MBKLUE , I hope my essay add some light for you too.

 

The EGR cooler tends to get blocked up (from EGR). That could have a lot to do with all your other issues.

 

thanks John. Any idea on how to remove and clean? Direction would be appreciated. What shouldn’t I be looking at? Thanks