P0421

[birchette42]

Ok so I have a obx header no pre cat and magnaflow catalyst converter with n1 style catback exhaust and p0421 code keeps coming up warm up below threshold blank 2 or something like that is there anything i can do to fix this or wats going on

[oakrdrs187]

Get a spark plug fouler and put it between the oxygen sensor and the exhaust, or go on ebay a search for a "oxygen sensor spacer 90" its basically the same idea but it creates a 90° bend, I think this method works better.