Kryptek49 Posted February 5, 2019 Share Posted February 5, 2019 (edited) I've had a couple codes pop up recently - P0133 & P0131 which both relate to an O2 Sensor - Bank 1 Sensor 1. I've already got a replacement sensor from Zmanalex, however I don't know which one I'm meant to replace. Is it nearside or offside, and before or after the cat? I think it's Offside Upstream but wanted to confirm before I have to go through the massive PITA to swap it. On a side note - I've only had the car about 6 months, and the previous owner had it UpRev remapped when he had decats fitted. I'm now back on stock cats, so would Abbey Motorsports not have disabled the pre-cat O2 sensors so that there was no warning light while running on decats? Thanks in advance Edited February 5, 2019 by Kryptek49 Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted February 5, 2019 Share Posted February 5, 2019 Bank 1 is the driver's side on a RHD vehicle. Sensor 1 is the front sensor in the exhaust manifold. You will have to talk to Abbey about the rear sensor switch off. 1 Quote Link to comment Share on other sites More sharing options...
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