P0171 oxygen sensor no voltage
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Junior Member
Joined: May 2014
Posts: 48
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From: Cyprus island
clk200 w209 2004 kompressor
P0171 oxygen sensor no voltage
Hello.The yellow engine light showed up giving codes P0170 and P0171. Maf is brand new but what i have noticed on torque pro app is tha bank 1 sensor 1 does not give any readings or voltage . Do you believe this is the reason ?
Junior Member
Joined: Mar 2017
Posts: 26
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From: Estonia
Mercedes-Benz CLK200K 2005
My torque app also doesnt show first o2 sensor voltage.
Mu p0171 and p0170 problems started because oil in wire harness. Check your camshaft magnet plugs
Mu p0171 and p0170 problems started because oil in wire harness. Check your camshaft magnet plugs
Last edited by kev95; Apr 7, 2017 at 05:00 AM.
Thread Starter
Junior Member
Joined: May 2014
Posts: 48
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From: Cyprus island
clk200 w209 2004 kompressor
yes you are right their ar leaking ... a little bit . how to remove oil from harness ? it seems it travelled all the way to ecu because i found some oil there
Junior Member
Joined: Mar 2017
Posts: 26
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From: Estonia
Mercedes-Benz CLK200K 2005
Check o2 connectors too. I replaced both cam magnets, added "pigtails", replaced front o2 sensor(rear sensor plug was clean).
For the wire harness, I used contact cleaner spray, alot of it.
After fix, it was good for ~ 400km but then CEL came back with P0170 code. I havent found out what the issue is yet.
For the wire harness, I used contact cleaner spray, alot of it.
After fix, it was good for ~ 400km but then CEL came back with P0170 code. I havent found out what the issue is yet.
Junior Member
Joined: Mar 2017
Posts: 26
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From: Estonia
Mercedes-Benz CLK200K 2005
I will give you product numbers for magnets and pigtails so you could stop existing oil leak into wire harness.
2x A271 150 27 33 - "pigtail" wire
2x A271 051 01 77 - Cam magnets
2x A010 997 23 48 - O-rings for cam magnets.
2x A271 051 00 32 - rubber plugs for cam magnets
2x A271 150 27 33 - "pigtail" wire
2x A271 051 01 77 - Cam magnets
2x A010 997 23 48 - O-rings for cam magnets.
2x A271 051 00 32 - rubber plugs for cam magnets
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Thread Starter
Junior Member
Joined: May 2014
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From: Cyprus island
clk200 w209 2004 kompressor
but my question remains. the wires have oil in them . how do i clean them ?because they go all the way to the ecu and o2 sensors. do i need to replace them or can i clean them ?and if so how can i clean them ?
Junior Member
Joined: Mar 2017
Posts: 26
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From: Estonia
Mercedes-Benz CLK200K 2005
You can replace entire engine wire harness and that would be better than what I did but I went harder and alot cheaper way. I cleaned all plugs that had oil in them and after every 3 days I check and if needed clean plugs again. It should get oil out of them eventually.
Somebody here at mbworld removed engine harness, and soaked them in alcohol I think.
Theoretically you can also open ECU and clean it with contact cleaner too, I didnt.
Somebody here at mbworld removed engine harness, and soaked them in alcohol I think.
Theoretically you can also open ECU and clean it with contact cleaner too, I didnt.
Thread Starter
Junior Member
Joined: May 2014
Posts: 48
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From: Cyprus island
clk200 w209 2004 kompressor
hello there. i have changed the complete wire harness cam magnets for 400 euro in cyprus i think i a good price. but there is a problem still i hope you can help me.
strange coincidence i press the brakes suddenly abd the yellow managment icon appeared and codes p0170 and p0171
strange coincidence i press the brakes suddenly abd the yellow managment icon appeared and codes p0170 and p0171
Junior Member
Joined: Mar 2017
Posts: 26
Likes: 8
From: Estonia
Mercedes-Benz CLK200K 2005
Check 12$ PCV hose, maybe you have an air leak?
https://mbworld.org/forums/c-class-w...placement.html
Did you check you O2 sensor plugs for oil? If they have oil in them, they are probably dead too.
Also it wouldn't be bad to clean MAF with MAF cleaner spray(During PCV hose check/repalcement)
PS:
you can read my threads, I had same problem. Maybe it will help you somehow.
https://mbworld.org/forums/clk-class...p0036-cel.html
https://mbworld.org/forums/clk-class...ion-p0170.html
https://mbworld.org/forums/clk-class...170-p0171.html
https://mbworld.org/forums/c-class-w...placement.html
Did you check you O2 sensor plugs for oil? If they have oil in them, they are probably dead too.
Also it wouldn't be bad to clean MAF with MAF cleaner spray(During PCV hose check/repalcement)
PS:
you can read my threads, I had same problem. Maybe it will help you somehow.
https://mbworld.org/forums/clk-class...p0036-cel.html
https://mbworld.org/forums/clk-class...ion-p0170.html
https://mbworld.org/forums/clk-class...170-p0171.html
Thread Starter
Junior Member
Joined: May 2014
Posts: 48
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From: Cyprus island
clk200 w209 2004 kompressor
Check 12$ PCV hose, maybe you have an air leak?
https://mbworld.org/forums/c-class-w...placement.html
Did you check you O2 sensor plugs for oil? If they have oil in them, they are probably dead too.
Also it wouldn't be bad to clean MAF with MAF cleaner spray(During PCV hose check/repalcement)
PS:
you can read my threads, I had same problem. Maybe it will help you somehow.
https://mbworld.org/forums/clk-class...p0036-cel.html
https://mbworld.org/forums/clk-class...ion-p0170.html
https://mbworld.org/forums/clk-class...170-p0171.html
https://mbworld.org/forums/c-class-w...placement.html
Did you check you O2 sensor plugs for oil? If they have oil in them, they are probably dead too.
Also it wouldn't be bad to clean MAF with MAF cleaner spray(During PCV hose check/repalcement)
PS:
you can read my threads, I had same problem. Maybe it will help you somehow.
https://mbworld.org/forums/clk-class...p0036-cel.html
https://mbworld.org/forums/clk-class...ion-p0170.html
https://mbworld.org/forums/clk-class...170-p0171.html
Junior Member
Joined: Mar 2017
Posts: 26
Likes: 8
From: Estonia
Mercedes-Benz CLK200K 2005
Look at the thread I posted, there are pictures that show how to dismantle everything and excact location of that hose.
https://mbworld.org/forums/c-class-w...placement.html
https://mbworld.org/forums/c-class-w...placement.html
Thread Starter
Junior Member
Joined: May 2014
Posts: 48
Likes: 0
From: Cyprus island
clk200 w209 2004 kompressor
hi thanks for your assistanse so far kev95 . I have check visually the o2 sensors for oil in the plug. i can not see any oil on the plugs . are the o2 faulty ? is there a way i can check them ?if not the 02 then what is the problem if these codes show up ?
p0171
p201c
p201e
p2029
p0171
p201c
p201e
p2029
Junior Member
Joined: Mar 2017
Posts: 26
Likes: 8
From: Estonia
Mercedes-Benz CLK200K 2005
I think you should check breather hose for cracks and leaks.
https://mbworld.org/forums/c-class-w...placement.html
https://mbworld.org/forums/c-class-w...placement.html
Senior Member
Joined: Sep 2002
Posts: 352
Likes: 12
From: Worcester, MA
15' CLS400
Follow up question, what was the outcome of reading the O2 sensors? Should we get actual voltage readings when using an ODBII app like Torque or Car Gauge Pro? I'm currently fighting with a P0172 "Bank 1 too rich" code with a rough idle after the engine is at operating temp. Anyway, I was trying to read the sensors but nothing shows up. I had autozone use their scanner which said the sensors were OK but they guy didn't say anything further. I've done a lot of other tests and I think I've narrowed it down to these sensors but I'm trying to be sure. As a side note I did have an oil pan leak that I just fixed and noticed some oil did get into the connectors which I cleaned out. Would the sensors report ok but give bad readings? Would a high end reader be able to get the voltages? What should they be?
