o2 sensor help
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Joined: Dec 2010
Posts: 712
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From: chicago
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; Jan 12, 2011 at 10:15 PM.
MBWorld Fanatic!
Joined: Feb 2009
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From: fort worth, tx
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.
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Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
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.
Last edited by Glyn M Ruck; Jan 13, 2011 at 05:52 AM.
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2019 G70 6MT & 2022 Ford Maverick XL
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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Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
No - Allowing the car to ingest a spray containing silicone would & leaded fuel would but it would take about 20K miles.
