blackduck08 Posted September 29, 2019 Report Share Posted September 29, 2019 Hello. I own a rebuilt 2018 Ford Edge SEL 2.0. I'm getting a P0036 code (P0036 - HO2S Heater Control Circuit Bank 1 Sensor 2). Where is the rear oxygen sensor located at? See picture; it this the correct one? Is anybody else having this same problem? Thank you for your help. Quote Link to comment Share on other sites More sharing options...
1004ron Posted September 29, 2019 Report Share Posted September 29, 2019 It is the one after the first catalytic converter - cant tell clearly from your photo. Quote Link to comment Share on other sites More sharing options...
blackduck08 Posted September 30, 2019 Author Report Share Posted September 30, 2019 (edited) I tried looking for it but can't find it. I'm lost. if you zoom the picture, you will see the oxygen sensor. The photo is facing towards the engine. Edited September 30, 2019 by blackduck08 Quote Link to comment Share on other sites More sharing options...
1004ron Posted September 30, 2019 Report Share Posted September 30, 2019 I see it, but can't tell if its after the first CAT - the Front/1st O2 sensor is immediately after the exhaust manifold, and these days the 1st CAT is also very close to the exhaust manifold. Quote Link to comment Share on other sites More sharing options...
blackduck08 Posted September 30, 2019 Author Report Share Posted September 30, 2019 Maybe this will help. This is the catalytic convertor (part) for my vehicle. Is the hole in the highlighted upstream or downstream? 2 Quote Link to comment Share on other sites More sharing options...
1004ron Posted September 30, 2019 Report Share Posted September 30, 2019 (edited) 9 hours ago, blackduck08 said: Maybe this will help. This is the catalytic convertor (part) for my vehicle. Is the hole in the highlighted upstream or downstream? Great, and the first picture shows the port for "Sensor 2" downstream sensor that the OP is looking to confirm. Edited September 30, 2019 by 1004ron Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted September 30, 2019 Report Share Posted September 30, 2019 (edited) N/M Edited September 30, 2019 by WWWPerfA_ZN0W Quote Link to comment Share on other sites More sharing options...
blackduck08 Posted October 2, 2019 Author Report Share Posted October 2, 2019 Okay, so the real world picture shown is the downstream sensor, correct? Quote Link to comment Share on other sites More sharing options...
handfiler Posted October 2, 2019 Report Share Posted October 2, 2019 The upstream oxygen sensor is located before the catalytic converter. The downstream oxygen sensor is located directly after the catalytic converter. Quote Link to comment Share on other sites More sharing options...
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