2004 Audi A4 1.8l fwd 4d sedan O2 Sensor

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03-07-2019, 09:01 PM

Daryl J Elias

1st Gear

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Join Date: Dec 2018

Posts: 5

2004 Audi A4 1.8l fwd 4d sedan O2 Sensor

I have a PO135 code bank 1 sensor 1. I don't know if it's upstream or downstream or where it's located? Can someone help me?

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