charlieb71 Posted February 20, 2018 Share Posted February 20, 2018 Help please. There's a "hole" on the exhaust manifold near the head that looks like it should be for a sensor. I noticed it on the freeway when it must have blown out whatever was mounted in the hole and the car sounded like it had an exhaust leak. The O2 sensor is is downstream from there and attached. What goes in this hole? I apologize if my terms were incorrect or unclear. Any help is appreciated. Quote Link to comment Share on other sites More sharing options...
naru Posted February 20, 2018 Share Posted February 20, 2018 I think you have an EA-81T up pipe on your car. They mount the O2 sensor there. Plug the hole w/a dead sensor or WHY. 3 Quote Link to comment Share on other sites More sharing options...
john in KY Posted February 20, 2018 Share Posted February 20, 2018 Having owned several turbos, been more than a few years ago, I recall that hole is where the O2 sensor goes. Turbo models only used one sensor so can't explain the second one downstream. 1 Quote Link to comment Share on other sites More sharing options...
charlieb71 Posted February 21, 2018 Author Share Posted February 21, 2018 The previous owner did do some funny stuff. I think you all are right. I'll just plug it up. Thanks! Quote Link to comment Share on other sites More sharing options...
SiriusBlack Posted April 7, 2020 Share Posted April 7, 2020 (edited) That hole could have been installed by a previous owner for an air to fuel ratio gauge. Edited April 7, 2020 by SiriusBlack Quote Link to comment Share on other sites More sharing options...
carfreak85 Posted April 7, 2020 Share Posted April 7, 2020 2 hours ago, SiriusBlack said: That hole could have been installed by a previous owner for an air to fuel ratio gauge. The EA81T had the o2 sensor in the uppipe, the EA82T has the sensor in the downpipe. Besides those two differences, both the exhaust manifold and the downpipe can be swapped between generations, as long as you are aware of the sensor placement. That is likely what happened here. Quote Link to comment Share on other sites More sharing options...
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