System Too Rich Bank 1 & 2

[ahmadsharbaji]

Most of the mechanics here misdiagnose the problems. And if the user needs to change 1 part, they make him change 5 parts until he reaches the desired solution.

I have these codes in the picture, please help me. What is the solution to my problem?
The car is W203, C230 Sport 2007.
My problem is that my car consumes a lot of fuel, instead of consuming 140 km in the tank, it consumes a maximum of 95 km. What is the cause of my problem and what is the solution?

 

[oleks1992]

Does yours have m271 kompressor engine?

 

[ahmadsharbaji]

Does yours have m271 kompressor engine?

No Sir. Normal V6

 

[oleks1992]

Could be many issues at the same time, first thing is to check if airbox is sitting on the airmass sensor at the back properly and the seal not leaking, check your air filters if they're clogged, check your injectors, check your airmass and lambda values too on live data

 

[alexanderfoti]

The ecu is sensing that the exhaust gas contains too little oxygen and that the mixture is too rich. It is doing this via the o2 sensors before the catalyst.

The ecu is then trying to remove fuel from the base map to correct this.

Once it reaches a limit (usually 20%) it will log this code.

As your car has a maf, you need to check that the information the car is being fed about air mass is correct, then verify downstream.

If the air flow sensor is sensing more air than is actually flowing through it, the ecu will add more fuel for this air. This will result in a rich mixture, and the o2 sensor will sense rich mixture and set the codes.

If all these values are correct, then the issue is leaky fuel injectors, or blocked air filters, rail pressure (too high).

If the values are incorrect, then check sensors (MAF, o2 etc)

 

[Steve@Avantgarde]

2007 230K engine with self adaption issues:

There are 2 faults that cause that, the rubber hose under the manifold and the bypass valve or a stretched timing chain. Youll need to remove the airbox to check the pipes and youll need a bore scope to check the one that goes under the manifold.

If thats ok then remove the rocker cover and time the engine up.

 

[alexanderfoti]

2007 230K engine with self adaption issues:

There are 2 faults that cause that, the rubber hose under the manifold and the bypass valve or a stretched timing chain. Youll need to remove the airbox to check the pipes and youll need a bore scope to check the one that goes under the manifold.

If thats ok then remove the rocker cover and time the engine up.

OP said 272 engine?

 

[Steve@Avantgarde]

OP said 272 engine?

So he did..

Looks like an overfuel going on there. Potentially injector related which is nuking the KATs causing the self adaption fault. Cylinder 5 is potentially the giveaway.

 

[ahmadsharbaji]

Most of the mechanics here misdiagnose the problems. And if the user needs to change 1 part, they make him change 5 parts until he reaches the desired solution.

I have these codes in the picture, please help me. What is the solution to my problem?
The car is W203, C230 Sport 2007.
My problem is that my car consumes a lot of fuel, instead of consuming 140 km in the tank, it consumes a maximum of 95 km. What is the cause of my problem and what is the solution?

*** UPDATE ***

Now after replacing the ignition coil with a new one, the misfiring is gone.
So now,
I have no fault codes on the engine or the transmission. But, Here are some apparent symptoms that I'm facing:

• I am facing a hurting/ugly smell out of the exhaust (not all the time but especially in the first start).
• Facing hard starting up when I start the car at the beginning of the day (temp here is around 20°C).
• Very poor fuel consumption! This engine should consume about 160 km in the city per tank. It really does go 100 km max!
• Sometimes, some hesitation.

After hard and deep research, I'm almost sure that my problem is the Mass Air Flow Sensor (MAF). I ordered a cleaning spray, but haven't received it yet. But with this post and the attached pictures of the live data (Please see the links), what do you think is the solution to the problem? I have read that the result of the O2 sensors should be between 0 and 1. But I have about 1.45 !!!
I also have thought, as long as the O2 sensors are giving results, does this mean that they are working properly?

Data stream results:
https://i.ibb.co/ZV4MGf0/1.jpg
https://i.ibb.co/WzNmnPn/2.jpg
https://i.ibb.co/hC90wD9/3.jpg

 

[Steve@Avantgarde]

I wouldnt have thought it would be the MAF. You could easily rule that out with live data anyway. I dont think the MAF is a hot film type on the 272 meaning that it doesnt rely on that for fuel map.

02 sensor results are interesting. You links dont load so I cant see the data but this is where Xentry comes into its own. You can do an 02 layover test which directly shows the 02 performance in graph form. That will show if the 02s have correct function performance in their operation but also if the KATs are allowing correct performance. Same too with the MAF. It cuts out all this guesswork.

If you want to test the 02, you could measure the internal resistance as a start point. 6ohms (I think is near spec).

 

[ahmadsharbaji]

I wouldnt have thought it would be the MAF. You could easily rule that out with live data anyway. I dont think the MAF is a hot film type on the 272 meaning that it doesnt rely on that for fuel map.

02 sensor results are interesting. You links dont load so I cant see the data but this is where Xentry comes into its own. You can do an 02 layover test which directly shows the 02 performance in graph form. That will show if the 02s have correct function performance in their operation but also if the KATs are allowing correct performance. Same too with the MAF. It cuts out all this guesswork.

If you want to test the 02, you could measure the internal resistance as a start point. 6ohms (I think is near spec).

Hello Sir, may you please reach out this post ? https://forums.mercedesclub.org.uk/...bad-fuel-consumption-system-rich-lean.195937/ I provided all the live data you may need. I really need your help. Thank you

 

[ahmadsharbaji]

The ecu is sensing that the exhaust gas contains too little oxygen and that the mixture is too rich. It is doing this via the o2 sensors before the catalyst.

The ecu is then trying to remove fuel from the base map to correct this.

Once it reaches a limit (usually 20%) it will log this code.

As your car has a maf, you need to check that the information the car is being fed about air mass is correct, then verify downstream.

If the air flow sensor is sensing more air than is actually flowing through it, the ecu will add more fuel for this air. This will result in a rich mixture, and the o2 sensor will sense rich mixture and set the codes.

If all these values are correct, then the issue is leaky fuel injectors, or blocked air filters, rail pressure (too high).

If the values are incorrect, then check sensors (MAF, o2 etc)

Hello Sir, may you please reach out this post ? https://forums.mercedesclub.org.uk/...bad-fuel-consumption-system-rich-lean.195937/ I provided all the live data you may need. I really need your help. Thank you

 

[Bay Leaf]

Live Data? I come from an era of carburettors/points/condensers etc. I'm puzzled with the afore mentioned. I have a icarsoft Mb v1.0 scanner but I don't understand how to read "live data" Any help/advice on this topic would be very much appreciated.