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Old 19-05-17, 07:45 AM   #1
Join Date: Jun 2015
Posts: 76
Default Downstream O2 sensor bypassing

Hello Dears

307, 1.4, 2003, 1.4, manual

I am trying to bypass the downstream O2 sensor in my car. I have successfully bypassed the upstream one using a capacitor and a resistor as follows:

While this didn't work on the downstream sensor!!, I still got P0141 what I need to know is the following:

1- Is there any difference between the upstream and downstream sensors wires?.

2- After some troubleshooting it might be the wires. Where the downstream wires end up?, is it in the ECU? where exactly in the ECU?.

3- Does the P0141 causing the car to operate in the open loop?.
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Old 19-05-17, 07:40 PM   #2
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Join Date: Sep 2016
Location: Stoke on Trent
Posts: 1,796

On the seat altea I have they are different. Upstream has 5 wires and downstream has 4 and they physically look different to!
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