o2 sensor help
#1
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2005 c230 kompressor 2003 s500 94 wrangler
o2 sensor help
2005 c230 kompressor 41k miles
code reads po171 bank 1
since their are 2 upstream o2 sensors before the cat.
how do i know which sensor if their are 2?
i tried getting this fixed but the mechanic said my bosch exact fit 5 wire o2 sensor might fail in a week. changed it anyway.
4 days later cel came back on with same code.
code reads po171 bank 1
since their are 2 upstream o2 sensors before the cat.
how do i know which sensor if their are 2?
i tried getting this fixed but the mechanic said my bosch exact fit 5 wire o2 sensor might fail in a week. changed it anyway.
4 days later cel came back on with same code.
Last edited by sammydragon3; 01-12-2011 at 10:15 PM.
#2
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06 C230 SS 6spd
If you go to autozone or oreilys and have them read the code, it'll usually tell you which position or o2 sensor it is. It'll say 1 or 2 and usually 1 is the closest sensor to the engine.
#3
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There have been a few exhaust changes on the M271 but there should only be one O2 sensor before Cat - 130 in this diagram - Please only use genuine Bosch heated replacement - Do not use universal sensors even if they are Bosch.
![](https://mbworld.org/forums/attachments/c-class-w203/200099d1294915730-o2-sensor-help-m271-exhaust-manifold-cat.jpg)
Last edited by Glyn M Ruck; 01-13-2011 at 05:52 AM.
#5
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Well there aren't two banks since it is an I4. I took what he said to mean that if it says Bank 1 it is closest to the engine and Bank 2 to mean it is furthest way. Not sure if that's accurate but that's how I took it.
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#11
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No - Allowing the car to ingest a spray containing silicone would & leaded fuel would but it would take about 20K miles.