Crown Automotive 56041213 Upstream Oxygen Sensor for 99-00 Jeep Wrangler TJ with 2.5L or 4.0L, 2000 Cherokee XJ with 4.0L & 96-99 Grand Cherokee ZJ & WJ with 4.0L, 5.2L or 5.9L Engines

In the figment the 4th bulletin says 2000 xj before cat,rear. On my 2000 xj Before the cat is the front. Mine only has 2 sensors total. the one before the cat is the front.OEM part number is 56044214aa.my rear OEM part number is 56041213ag. They have this one in the wrong fitment. They said a 56041056 fit the rear..it don’t. It’s the wrong part number and it has fine threads.both mine has coarse threads. They have California emissions mixed up with federal emissions. They require different sensors. The OEM sensors have the part number stamped on them which I didn’t know until I ordered these from quadratec. I talked to them on the phone and they said these would fit but they don’t.I will be returning mine. I hope they get their numbers straightened out.