GLK250 error codes 01/02 and 02/02
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GLK250
GLK250 error codes 01/02 and 02/02
CEL illuminated 2y ago. Car ran well with a full power and a good mileage. Codes 01/02 and 02/02 were detected and turned off. Reappeared 1y ago and then more frequently, now after only 10 mi drive. I changed the air filter (1st time with 34,000 mi) and and cleaned the MAF with the spray. What could be the issue? What would be the next thing to check?
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GLK 250
I've never seen those codes; what scan tool are you using?
Most likely related to the DPF and regen not happening correctly, but without a proper scan tool that gives you MB specific codes we are just guessing.
Most likely related to the DPF and regen not happening correctly, but without a proper scan tool that gives you MB specific codes we are just guessing.
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GLK250
P0202 cyl 2 injector circuit malfunction
Tool is Quicklynks, should the codes be universal? As per google the problem is Cylinder 2 injector circuit malfunction. So dpf cleaning next? Thanks for your suggestion.
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GLK250
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The codes came up after cleaning with spray? Do you think the spray caused the codes? P0102 is related to the MAF sensor. P020 is related to injectors. Could the spray used have affected the MAF and injectors?
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GLC300 (mine) GLK250 (wife's)
P0102 is Mass Air Flow Sensor, P0202 is a fuel injector issue cylinder 2.
Check for a vacuum leak, external wiring to the MAF, remove the MAF and check if it is dirty, if so clean it. If these fail you may have to replace the MAF.
The Fuel Injector code may/may not be caused by the MAF issue. If not, check the wiring then the injector.
If you take your GLK to a good indy with MB experience (avoid dealers if possible) make sure they check all possibilities and they don't just throw parts at the problem. That gets expensive.
Good luck
Check for a vacuum leak, external wiring to the MAF, remove the MAF and check if it is dirty, if so clean it. If these fail you may have to replace the MAF.
The Fuel Injector code may/may not be caused by the MAF issue. If not, check the wiring then the injector.
If you take your GLK to a good indy with MB experience (avoid dealers if possible) make sure they check all possibilities and they don't just throw parts at the problem. That gets expensive.
Good luck
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GLK 250
Correct, I believe cylinders are in order front to back (or from timing belt/chain and counting away from it on a transverse mount).
I would definitely check the fuel injector wiring. I would also consider a fuel injector cleaner such as LubroMoly's Diesel Purge.
When the CEL comes on, is the engine performance affected in any discernible way?
I would definitely check the fuel injector wiring. I would also consider a fuel injector cleaner such as LubroMoly's Diesel Purge.
When the CEL comes on, is the engine performance affected in any discernible way?
Last edited by andreigbs; Oct 24, 2019 at 10:36 AM.
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GLK250
CEL appearance has no effect on performance, running sound or any other feature. I am also thinking about swapping the wiring and /or fuel tube between 2 and 3 and see if the error code changes to nr 3 cylinder. I assume they may be interchangeable.
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And what code(s) are present still?
The wiring is part of the injector, you won't be able to swap it. Also the metal rail tubes are bent in certain shapes to accommodate each injector's location with regard to the fuel rail; these also are not interchangeable without placing serious stress on those bends. I wouldn't try it.
What I would try though is to unplug injector 2 wiring harness, clean out with compressed air spray and reconnect snugly.
I would also try that injector cleaner I mentioned, at the next fuel filter change (every 40K miles). Look up diesel purge on YouTube for a tutorial on how to run it straight from the bottle to all 4 injectors. I do this on all my diesels and it has always helped.
The wiring is part of the injector, you won't be able to swap it. Also the metal rail tubes are bent in certain shapes to accommodate each injector's location with regard to the fuel rail; these also are not interchangeable without placing serious stress on those bends. I wouldn't try it.
What I would try though is to unplug injector 2 wiring harness, clean out with compressed air spray and reconnect snugly.
I would also try that injector cleaner I mentioned, at the next fuel filter change (every 40K miles). Look up diesel purge on YouTube for a tutorial on how to run it straight from the bottle to all 4 injectors. I do this on all my diesels and it has always helped.
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2015 GLK250 Bluetec
Can you repost the injector cleaner you recommended?
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GLK 250
LiquiMoly Diesel Purge. Comes in 500mL cans and you can find tutorials on YouTube of how to run it straight from the can. It’s much more effective that way than dumping it into the fuel tank.
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GLK250
Howdy,
The same error code came back. Since spraying contact spray to the wiring helped, the next step I will try is to unplug the cyl 2 wire and spray contact spray to the connectors. Can you advice how to detach them? Also, what is that wiring set called, if I need to buy (order) new one? Thanks!
The same error code came back. Since spraying contact spray to the wiring helped, the next step I will try is to unplug the cyl 2 wire and spray contact spray to the connectors. Can you advice how to detach them? Also, what is that wiring set called, if I need to buy (order) new one? Thanks!
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GLK 250
Not sure if you can unplug the wiring harness at the opposite end of the injector(s), I haven’t had to fiddle with it yet. You might want to clean all contacts with electronics spray cleaner and reconnect.
As for wiring harness itself, perhaps someone with WIS can chime in. I’ll see what I can find meantime.
You might want to rethink if it’s possibly the injector itself, or the fuel you’re using, or a dirty fuel filter. Rule other things out, starting with the easiest and cheapest.
As for wiring harness itself, perhaps someone with WIS can chime in. I’ll see what I can find meantime.
You might want to rethink if it’s possibly the injector itself, or the fuel you’re using, or a dirty fuel filter. Rule other things out, starting with the easiest and cheapest.
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GLK250
Update to this issue: After spraying the coupling with a contact spray, the CEL light stayed off almost for a year. When it came back, I ordered a new wire harness. However, the parts ordered in EU for EU delivered cars, don't fit for my car that was purchased in the USA and then moved to Finland. The local dealer replaced a some chords only. I turned off the light, but it came back after 20 miles. The next step is to buy a new wire harness the next time I visit the USA. Hopefully in Sep. However, I am thinking that driving with the light on does not damage the engine. The system will most likely shut down the engine or puts it in a limp-home mode, if there is a problem that would damage the engine, eh?
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GLK 250
If it goes into limp mode, you'll definitely know it. Along with severely reduced power and jerky shifting.
I'm curious if it's still the injector code(s) or if it's the MAF code. We never talked about checking the intercooler hose (driver's side) which is a common failure item that leads to, weirdly, a MAF code.
Because of the location and shape of this boost hose, it is likely to develop tears and let boost escape. You wouldn't notice it right away, especially if you're not always driving around like a hooligan. A close visual inspection of that hose may be in order. There are several threads around that will be helpful. Here's one to get you started.
Good luck!
I'm curious if it's still the injector code(s) or if it's the MAF code. We never talked about checking the intercooler hose (driver's side) which is a common failure item that leads to, weirdly, a MAF code.
Because of the location and shape of this boost hose, it is likely to develop tears and let boost escape. You wouldn't notice it right away, especially if you're not always driving around like a hooligan. A close visual inspection of that hose may be in order. There are several threads around that will be helpful. Here's one to get you started.
Good luck!
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2011 GLK 350 4Matic
... or switching to another (proper) forum for your vehicle. Our GLKs were old cars before your GLC was built! ;-)
But yeah, your plan sounds like the right one - swap the suspect injector with a neighbor, clear the codes and see if the problem follows the injector, or sticks with the original cylinder (leading to more fun troubleshooting). But us DIY wrench-twisters on this forum are a lot better at the M272 and M276 V6s than, well, anything else.
But yeah, your plan sounds like the right one - swap the suspect injector with a neighbor, clear the codes and see if the problem follows the injector, or sticks with the original cylinder (leading to more fun troubleshooting). But us DIY wrench-twisters on this forum are a lot better at the M272 and M276 V6s than, well, anything else.
