How to Read O2 Sensor Data
Thread Starter
Newbie
Joined: May 2017
Posts: 6
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2005 C230
How to Read O2 Sensor Data
I am trying to get a P0240 code (low cat efficiency) cleared. Of course it might be related to it being a well used cat(200k miles), but it might be the O2 sensors.
I have a cheap ELM327 reader and use Torque both of which seem to work. I get a reading for O2 sensor bank 1-sensor 2 but not for sensor 1. I have replaced both sensors. Is this normal or am I missing something? Is there a better free option than Torque. Any ideas on what the O2 sensors should be reading?
Thanks
I have a cheap ELM327 reader and use Torque both of which seem to work. I get a reading for O2 sensor bank 1-sensor 2 but not for sensor 1. I have replaced both sensors. Is this normal or am I missing something? Is there a better free option than Torque. Any ideas on what the O2 sensors should be reading?
Thanks
Junior Member
Joined: Mar 2017
Posts: 26
Likes: 8
From: Estonia
Mercedes-Benz CLK200K 2005
To see sensor 1 graph then you should choose "O2 Sensor1 Equivalence Ratio" and you can see what your sensor is doing.
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Junior Member
Joined: Oct 2009
Posts: 17
Likes: 2
From: Toronto, Ontario
2005 C230K Coupe
O2 sensor
Yes using Torque app.
If chose 02 sensor bank 1 sensor 1 upper screen blank.
If chose 02 sensor bank 1 sensor 2 lower screen shows live Graff.
Did you end up solving your problem?
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Junior Member
Joined: Mar 2017
Posts: 26
Likes: 8
From: Estonia
Mercedes-Benz CLK200K 2005
Yes, I solved my problem.
My P0170 and P0171 was solved after cleaning MAF with cleaner and during maf removal I found a problem with one airbox clamp. It wasnt tight anymore and it had and airleak because of that. Tightened clamp and my fuel trim was nice again.
My thread: https://mbworld.org/forums/clk-class...p0036-cel.html
Thread Starter
Newbie
Joined: May 2017
Posts: 6
Likes: 0
2005 C230
Thought I would post the long overdue resolution to this issue.
1) Torque was not reading correctly and when I tried another monitoring program it cleared the lack of that one reading.
2) After changing the O2 sensors the problem persisted thus I expected the old cat was failing
3) Bought a aftermarket CAT (needed one CARB rated, but was only listed for 2004 not 2005) but it fit fine. Got it for $400.
4) Breezed though the smog check, Has been working fine ever since. Yea!
1) Torque was not reading correctly and when I tried another monitoring program it cleared the lack of that one reading.
2) After changing the O2 sensors the problem persisted thus I expected the old cat was failing
3) Bought a aftermarket CAT (needed one CARB rated, but was only listed for 2004 not 2005) but it fit fine. Got it for $400.
4) Breezed though the smog check, Has been working fine ever since. Yea!
