Unsolvable P0171 - C180 Kompressor (m271)
11-28-2022 | 03:10 PM
#26
Newbie
Joined: Nov 2022
Posts: 10
Likes: 0
w203 c230 kompressor 2005
11-29-2022 | 03:05 AM
#27
MBWorld Fanatic!
Joined: Dec 2003
Posts: 3,140
Likes: 214
From: Vancouver, BC, Canada
2003 C230K Coupe Orion Blue
It's probably defaulting to some map when the MAF is unplugged.
You can replace the MAF, but I would still look at the hoses first. The hoses are easier and cheaper to replace than the MAF.
While you're at it, check the large hose that goes from the muffler baffle into the EGR. This one is also known for cracking over time.
You can replace the MAF, but I would still look at the hoses first. The hoses are easier and cheaper to replace than the MAF.
While you're at it, check the large hose that goes from the muffler baffle into the EGR. This one is also known for cracking over time.
11-29-2022 | 06:30 PM
#28
Member
Joined: May 2021
Posts: 116
Likes: 21
From: Melbourne, Vic, Australia
C230K M271 CL203 2003 model
Make sure you are using OEM spark plugs! This can cause - P0171 SYSTEM TO LEAN
Spark plugs can make your car run lean so check there first if you did a change and getting lean errors. Stick to the good stuff!
Spark plugs can make your car run lean so check there first if you did a change and getting lean errors. Stick to the good stuff!
02-20-2023 | 08:38 AM
#29
Newbie
Joined: Jun 2022
Posts: 10
Likes: 0
MB W203 C230 KOMPRESOR
Hello Aggelos katerin ,i have same problem my stft cloes to 0 and idle but ltft +25 all all time its not moving , did you fix it? Thank you
02-20-2023 | 08:42 AM
#31
Newbie
Joined: Jun 2022
Posts: 10
Likes: 0
MB W203 C230 KOMPRESOR
Hi all,
I am at my wits end this p0171 issue, I have tried pretty much everything and do not know where to look further.
Model: 2007 C180 Kompressor Auto
VIN: WDC2030462R261104
Engine Number: 27194630861788
The history:
I have propaned the engine bay thoroughly and cannot find any air leaks, what could be causing this problem?
I would love to save someone this horrible ordeal, any good information will be acted on and I will keep the forum updated on any progress made.
Any required live data can be arranged, just let me know.
I am at my wits end this p0171 issue, I have tried pretty much everything and do not know where to look further.
Model: 2007 C180 Kompressor Auto
VIN: WDC2030462R261104
Engine Number: 27194630861788
The history:
- About 3 months ago I had rather high Long Term Fuel Trim Values of about +16.8 that would occasionally trigger the check engine light. When putting the engine under load it would subtract up to -7% and when at idle it would shoot up to around +10%.
- The fuel system would stay Closed loop most of the time but when moving the throttle it would bounce to Closed Loop Fault and occasionally Open Loop Drive.
- About a month ago the Long Term Trim numbers suddenly started getting worse, they went up to +17.2% and the 18.4%, This brought on the below work:
- Fuel System: New Fuel Pump and Sender Unit (Pierburg), New Fuel Pressure Regulator (Merc Original), New Injectors (Merc Original)
- Intake System: New Manifold Seals (Merc Original), New Throttle Body (Bosch OE), New Throttle body Seals (Merc Original), all pipes ion the system where then removed, cleaned, checked and refitted.
- Exhaust System: Flange was resealed, New o2 Sensors (Merc Original) and the manifold was checked by two shops for leaks.
- Ignition System: New Spark Plugs (Merc Original), New Ignition Coils (Beru OE)
- Sensors: New Cam Position Sensors (Bosch OE), new MaF Sensor (VDO OE), new MaP sensor (Merc Original), new Altitude Sensor (Merc Original), New Air Temperature Sensor (FAE)
- Miscellaneous: New Evap Solenoid (Merc Original), New PCV valve and piping (Merc Original)
I have propaned the engine bay thoroughly and cannot find any air leaks, what could be causing this problem?
I would love to save someone this horrible ordeal, any good information will be acted on and I will keep the forum updated on any progress made.
Any required live data can be arranged, just let me know.
