Maddog Posted August 4, 2017 Share Posted August 4, 2017 Need some advice in the matter, I'm about to put some HFC's on the 350 DE , And i thought it would be better to install another pair of O2 sensors rather than try and remove the ones in the OEM cats just incase i can't get them out without damaging them. Are they prone to get damaged easily, so buying second hand is a no no. Or are new sensors the only way forward, As i'm sure new sensors will cost a small fortune. Thanks Quote Link to comment Share on other sites More sharing options...
Zeezeebaba Posted August 4, 2017 Share Posted August 4, 2017 With post cat sensors and HFCS you may experience the CEL/EML light will come on. I had this issue with my Berk cats. I replaced with new sensors but it still came on regularly. Ultimately I went and got the Uprev map done and had them deleted. Pre cat sensors I replaced anyway as they are the important ones and have no influence on which cats are on the car. I wouldn't bother and save up to get the Uprev done with regards post cat sensors and get them deleted. Quote Link to comment Share on other sites More sharing options...
Maddog Posted August 4, 2017 Author Share Posted August 4, 2017 Going for the uprev next week at H-Dev, Although wouldn't have thought the uprev would delete the sensor, just corrects the CEL light on post cat sensors think i might bight the bullet and get some new ones before the uprev Quote Link to comment Share on other sites More sharing options...
Zeezeebaba Posted August 4, 2017 Share Posted August 4, 2017 (edited) It was my understanding the Uprev turned them off. Either way my CEL has not come on since the map. I still have them fitted but they do nothing. I think we mean the same thing mate. Edited August 4, 2017 by Zeezeebaba Quote Link to comment Share on other sites More sharing options...
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