MB W203 C230 KOMPRESOR : CODE P0171 SYSTEM TO LEAN
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MB W203 C230 KOMPRESOR
MB W203 C230 KOMPRESOR : CODE P0171 SYSTEM TO LEAN
Hello , i am new here, i have e Mercedes Benz W203 C230 KOMPRESOR M271 ENGINE with petron and LPG (STAG), i am writing here bacause i have more than 3 months that i am having a problem with P0171 CODE lean some times put me P0172 rich anyway mostly chek engine light with P0171 , now i have change EGR change all spark plugs with ignition coil chek for vacum hoes chek manifold change upstream o2 sensor change canister purge valve solenoid clean tow times MAF clean throttle body and the P0171 still there ,the mechanics here dont know very very much but they try ,so i have bought a scan tool that i connect with my phone and i am learing from it . I see that my STFT stay 0 or cloes to 0 in idle speed , but my LTFT stay 14.8 at idle speed , my o2 sensor stays form 0.45 volt to 0.85 volt , and i dont know what to do know because the mechanic says change it all with new but i can not change it without know where the problem is it also knowing that they cost a lot. I emphasize that both in petorl and LPG the values are almost the same .Hope that anyone can help me . Thank you
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From: So. Oregon Coast
C230 Sport Coup + 2006 W164 ML350 + 99 Ford Escort RIP
Nooo! Don't just start throwing parts at codes only read with OBD reader.
1st off, look for any vacuum hoses that are bad, that will cause it.
For me, I was getting that, it was hoses and also needed new MAF but was very hard to find a
good one. OEM was originally made by VDO Siemen. None of the knock offs are any good.
But only a scan with mercedes specific scanner will pin it down.
I never dealt with voltages etc. but O2 sensors are supposed to be good for 100K miles, so
if it's older than that it's probably a good idea to replace it.
All these things are easy to do yourself.
1st off, look for any vacuum hoses that are bad, that will cause it.
For me, I was getting that, it was hoses and also needed new MAF but was very hard to find a
good one. OEM was originally made by VDO Siemen. None of the knock offs are any good.
But only a scan with mercedes specific scanner will pin it down.
I never dealt with voltages etc. but O2 sensors are supposed to be good for 100K miles, so
if it's older than that it's probably a good idea to replace it.
All these things are easy to do yourself.
Thread Starter
Newbie
Joined: Jun 2022
Posts: 10
Likes: 1
MB W203 C230 KOMPRESOR
Nooo! Don't just start throwing parts at codes only read with OBD reader.
1st off, look for any vacuum hoses that are bad, that will cause it.
For me, I was getting that, it was hoses and also needed new MAF but was very hard to find a
good one. OEM was originally made by VDO Siemen. None of the knock offs are any good.
But only a scan with mercedes specific scanner will pin it down.
I never dealt with voltages etc. but O2 sensors are supposed to be good for 100K miles, so
if it's older than that it's probably a good idea to replace it.
All these things are easy to do yourself.
1st off, look for any vacuum hoses that are bad, that will cause it.
For me, I was getting that, it was hoses and also needed new MAF but was very hard to find a
good one. OEM was originally made by VDO Siemen. None of the knock offs are any good.
But only a scan with mercedes specific scanner will pin it down.
I never dealt with voltages etc. but O2 sensors are supposed to be good for 100K miles, so
if it's older than that it's probably a good idea to replace it.
All these things are easy to do yourself.
Thread Starter
Newbie
Joined: Jun 2022
Posts: 10
Likes: 1
MB W203 C230 KOMPRESOR
Nooo! Don't just start throwing parts at codes only read with OBD reader.
1st off, look for any vacuum hoses that are bad, that will cause it.
For me, I was getting that, it was hoses and also needed new MAF but was very hard to find a
good one. OEM was originally made by VDO Siemen. None of the knock offs are any good.
But only a scan with mercedes specific scanner will pin it down.
I never dealt with voltages etc. but O2 sensors are supposed to be good for 100K miles, so
if it's older than that it's probably a good idea to replace it.
All these things are easy to do yourself.
1st off, look for any vacuum hoses that are bad, that will cause it.
For me, I was getting that, it was hoses and also needed new MAF but was very hard to find a
good one. OEM was originally made by VDO Siemen. None of the knock offs are any good.
But only a scan with mercedes specific scanner will pin it down.
I never dealt with voltages etc. but O2 sensors are supposed to be good for 100K miles, so
if it's older than that it's probably a good idea to replace it.
All these things are easy to do yourself.
Newbie
Joined: Nov 2022
Posts: 10
Likes: 0
w203 c230 kompressor 2005
Hello sir , i rest all ecu data with mercedes benz ob2 scanner and for now no engine light in my dashboard ,anyway i make another test with my ob2 scanner (video recorder in highway) {https://mega.nz/file/cjR0lJaI#5GJsB9P6nFs6ZkAmxD6I1LkqWhgK9ThCBlMp-avTe3U} and i see that my STFT goiing up and down 0-25% and my MAF move little strange for my judgment ,so i am attach the video here to see if anyone can judgement this and help me . Thank you very much .
Last edited by Geri-go; Nov 28, 2022 at 03:58 PM.
Thread Starter
Newbie
Joined: Jun 2022
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MB W203 C230 KOMPRESOR
https://mega.nz/file/g7YD3CQA#OhWH6x...breAPcI1yhnWo0
Member
Joined: May 2021
Posts: 121
Likes: 22
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!
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Member
Joined: May 2021
Posts: 121
Likes: 22
From: Melbourne, Vic, Australia
C230K M271 CL203 2003 model
BOSCH FR-6-MPP-332 is OEM..
NGK should be OK, but may also be the cause of your issue?.. Coils and plugs form a circuit, and the electronics can influence the dwell, and timing of spark, causing a lean condition..
NGK should be OK, but may also be the cause of your issue?.. Coils and plugs form a circuit, and the electronics can influence the dwell, and timing of spark, causing a lean condition..
