Hello there
i just bought a w204 c250 Blueff and i had knocking for a long time due to the bad fuel quality in Egypt had misfire in cylinder 1 , it was bad coil in live data.
i changed 4 coils and 4 spark plugs and there is no knocking now finger crossed.
the problem is i have error P061A9A
i read the with carly obd and it states "P061A9A internal control module torque performance component or system operating condition"

i googled it and i couldnt figure out what are the possible causes.

keeping in mind that i have good pressure from both pumps

 

How many miles on your engine: 50, 100, 150KMi?

What maintenance was done in last 2 years ?

Why dont you get a scanner worth using it... with these vars iCarSoft or Xentry are very popular with troublesshooters.

The code you poped is extra strange... I am guessing there is a collection of other active codes mini scanner can not see!

Part of cars are kept standard by law but part are not to help keep repair business vibrant.

 

first of all i would like to thank you for your reply.
The car is now 87000 miles (139000km)
i just changed the thermostat, spark plugs, ignition coils, transmission oil.
i read the car with icarsoft and i got the same fault ! i know its strange but i googled and what i've found is that the torque has been decreased for 5 seconds 50 neutons which is too much !

 

Ok, got it thanks for these info.
You're lucky to have only one single fault... more strange.

A 5 second blank while driving... I guess has something to do with fuel pump or a failing connection to a major control piece (ECU, Tranny, SAM, pump, ...)

(a failing CKP sensor would have popped it's own related codes )

Have you tried to RESET this fault?
then fault came back as ACTIVE, right?
​​​​​​How does the CAR FEEL when that problem happen?

 

It looked familiar, so I looked it up. P061A faults are listed as transmission fault codes that are eligible for a waiver on state emission testing failures. I don’t know what the 9A is exactly, but I’m guessing that a place to begin would be the conductor plate in the transmission. There are sensors on it that monitor the inputs and outputs on clutch packs and gear sets. But I’m also surprised that there aren’t 2 or 3 other codes to go along with it that would help define the associated components.

 

here we we go same fault with xentry. The second one from the thermostat. Its original mercedes

 

these faults are STORED...

non active...

Simply reset faults and have a nice day then scan again in couple days.

 

when u did the trans flush did u do it correctly my guess would be u could be a little low or to much oil in the trans might cause something like this

 

How would i know ?
i think it took 9L

 

You seem to be fairly competent with general auto repairs. You will need enough lift to get the car high enough to do this. The 722.9 transmission has a specific fill procedure. Since the car has been run after the flush, the oil cooler and the torque converter should be filled. The transmission is filled to overflow at the fill fitting on the pan. The transmission must be up to a specific temperature for the level to be correct. If these things have been done, then the transmission fluid level should be correct. I don’t know all the details because I had it done at the dealership but it’s all available in this forum.

 

Vehicle raised and level. Start engine and shift through P-R-N-D several times with the vehicle stationary. Wait until transmission oil temperature reaches 45C (113F) then remove transmission drain plug. No flow - oil level too low, rapid flow - oil level too high, constant dribble - correct oil level.

 

i reset the fault and it only comes when i accelerate after 100km (kick down) i feel a little loss of power and it store the code

 

yes it is and it happen only when i use kickdown after 100km

 

Can you graph two things (before/during/after accelerations) that are likely impacting your engine performance:
-- charging voltage
-- high fuel pressure
-- low fuel pressure

I think one of these 3 graphs will show your problem. It's fairly common and often undetected.

You could try to charge up your battery full and quickly test for temporary improvements.