yewman Posted April 7, 2018 Share Posted April 7, 2018 After Diagnosing the Check engine light as the front sensor, I heated up the exhaust and tried carefully to remove the sensor by working the threads back and forward. It still came out with the threads stripped. I read somewhere that all Oxygen sensor threads are Aluminium. Is that correct? The threads in the exhaust box don't seem too bad, so I need to know what the thread is to buy a thread chaser. Tool shops only seem to be selling 18mm X1.5 or 12mm chasers. Measuring an undamaged part of the sensor thread where the washer had been, gave about 17.4mm across the threads. What is the correct size to buy please. Quote Link to comment Share on other sites More sharing options...
matt167 Posted April 7, 2018 Share Posted April 7, 2018 18mm spark plug chaser 1 Quote Link to comment Share on other sites More sharing options...
yewman Posted April 8, 2018 Author Share Posted April 8, 2018 Thanks for that information. The legacies seem to have different sensors according to the model. Is there a parts list somewhere to check the part number for a 2005 2.0i EJ202 engine? Quote Link to comment Share on other sites More sharing options...
Mike104 Posted April 8, 2018 Share Posted April 8, 2018 (edited) https://parts.subaru.com/ But that's for North America. You could try http://opposedforces.com/parts/ as they have European listings Edited April 8, 2018 by Mike104 Quote Link to comment Share on other sites More sharing options...
yewman Posted April 8, 2018 Author Share Posted April 8, 2018 Thanks a lot Mike, The European link is the one for me. My Legacy is a 2.0i, which is not available in the States. Yours start at the 2.5i. Paul Quote Link to comment Share on other sites More sharing options...
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