AZJeff Posted July 20, 2018 Share Posted July 20, 2018 My MJ has the engine from a 2000 XJ in it, and it has the California emissions system on it. I see two "mini-cats" just off the exhaust manifold, with pre and post cat O2 sensors. What I do not have is a second "main" cat converter further downstream. The FSM is contradictory here. It shows a main cat like all the "49 state Federal" in place along with the mini-cats, but the wiring diagrams do NOT show O2 sensors associated with the main cat., only with the mini-cats. So do the CA XJ's have three cats? If they do,does the main cat have any O2 sensors? i have to get the exhaust system right to pass emissions testing here in AZ. Link to comment Share on other sites More sharing options...
AZJeff Posted July 20, 2018 Author Share Posted July 20, 2018 Nobody knows? Eagle, you are a wizard on XJ's as well as MJ's. Do you have any clue, or know anyone on other forums who would know? Link to comment Share on other sites More sharing options...
Ωhm Posted July 20, 2018 Share Posted July 20, 2018 R U A V6, if so, I don't see no DTC's posted for a 3rd cat. Link to comment Share on other sites More sharing options...
AZJeff Posted July 21, 2018 Author Share Posted July 21, 2018 1 hour ago, Ωhm said: R U A V6, if so, I don't see no DTC's posted for a 3rd cat. A V6? A 2000 XJ never came with a V6, only the 4.0 in-line six. My FSM lists the following codes: P0143 (M) 1/3 O2 Sensor Shorted To Ground P0144 (M) 1/3 O2 Sensor Shorted To Voltage P0145 (M) 1/3 O2 Sensor Slow Response P0146 (M) 1/3 O2 Sensor Stays at Center Since they talk about O2 sensors 1/1 and 1/2, as well as 1/3, I thought it might be a sensor related to a third cat. I am still confused. Link to comment Share on other sites More sharing options...
Jeep Driver Posted July 21, 2018 Share Posted July 21, 2018 I don't if this will help you or not..... http://www.jeepforum.com/forum/f11/o2-sensor-confusion-1498743/ https://www.cherokeeforum.com/f2/number-o2-sensors-2000-a-76025/ https://www.cherokeeforum.com/f2/o2-sensor-location-163287/ Link to comment Share on other sites More sharing options...
sinkrun Posted July 21, 2018 Share Posted July 21, 2018 Two upstream o2`s in the exhaust manifold and two down stream just below the two mini cats nothing down on the third. Link to comment Share on other sites More sharing options...
AZJeff Posted July 21, 2018 Author Share Posted July 21, 2018 Thanks, "JeepDriver" and "Sinkrun" Those two details explain a lot that seemed a little unclear from the FSM. So it looks like I have all of the O2 sensors and wiring needed, along with the mini-cats. What I don't have is the "main" cat located downstream between the trans. mount and the muffler. I guess I have some shopping to do if I want to pass an emissions test. Link to comment Share on other sites More sharing options...
gogmorgo Posted July 22, 2018 Share Posted July 22, 2018 Just curious, has any AZ emission tech actually told you your exhaust isn't compliant? Link to comment Share on other sites More sharing options...
AZJeff Posted July 22, 2018 Author Share Posted July 22, 2018 2 hours ago, gogmorgo said: Just curious, has any AZ emission tech actually told you your exhaust isn't compliant? No, not yet. I have been debating this myself. Maybe when they "sniff" the unit (which is registered as a 1989), they will find it complies. The only thing stopping me right now is that the vehicle has no brakes, and I am waiting for parts to arrive to complete that task. Maybe I will take it to the emissions test station and see how it goes.... Link to comment Share on other sites More sharing options...
JeepSchmidt O'Guinness Posted July 22, 2018 Share Posted July 22, 2018 I thought there was something offered like diagnostics procedure's before you actually do the inspection test which can label your title as a gross polluter? Link to comment Share on other sites More sharing options...
AZJeff Posted July 24, 2018 Author Share Posted July 24, 2018 On 7/22/2018 at 11:22 AM, JeepSchmidt O'Guinness said: I thought there was something offered like diagnostics procedure's before you actually do the inspection test which can label your title as a gross polluter? If there is such a thing, there is no information on it anywhere on the Arizona DMV or Arizona Dept. of Environmental Quality websites. I cannot find any exceptions for vehicle age, etc. and I am unlucky enough to live in an area of this state that requires emissions testing. Link to comment Share on other sites More sharing options...
Ωhm Posted July 24, 2018 Share Posted July 24, 2018 Can you read OBD codes? Do you have "Check Engine" lamp? Found this link, maybe you did too. http://www.myazcar.com/obd-check-engine-light Link to comment Share on other sites More sharing options...
gogmorgo Posted July 24, 2018 Share Posted July 24, 2018 If it's only certain parts of AZ it might be county bylaws, not state. Link to comment Share on other sites More sharing options...
AZJeff Posted July 24, 2018 Author Share Posted July 24, 2018 My address is in the area that requires an emissions test. If I lived 2 miles east of here, I would be exempt. Since I am not roadworthy right now without brakes, I am not too concerned yet. I will probably take it in and have it tested with just the front two California cats, and see if it passes. I will also investigate the exemption mentioned in the link by "Ohm" Standby for more details later. Link to comment Share on other sites More sharing options...
Longview Posted July 24, 2018 Share Posted July 24, 2018 Fiancee drives a 2004 cali LJ. 2 cats on manifolds for both banks. O2s before cats for fuel mixture, O2s after cats for cat efficiency. 1 cat under the jeep, not monitored before or after. Sent from my SM-N920V using Tapatalk Link to comment Share on other sites More sharing options...
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