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  #1  
Old 07-06-2017, 07:18 PM
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Default altima 2003 3.5 catalytic not complete.

Hi all, am new here, but really need your help. I have a Altima 2003 3.5 with smog test fail first time, because 3 monitor was not ready, o2 and evap are ready but cat monitor not set ready (incomplete) was looking for a solution and found that the car need a drive cycle to be set monitor to ready and been driven over 100 miles on freeway and on streets but can set ready. I have no cat dtc codes. please need your help just one week for the expiration plates. thanks
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  #2  
Old 07-07-2017, 01:43 PM
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How long is the drive from your home to the smog test shop. If it is less than 10 minutes I suggest you do this: Instead of going straight to the shop from your home drive around for at least 10 minutes. Stop the car and shut down engine, wait a minute then start again and drive for another 5-10 minutes then go to the shop.

If you have a short drive to the shop what happens is the CAT hasn't reach an operating temp. that it starts to work which is at about 800F.
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Old 07-07-2017, 07:05 PM
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HI bennyb53, thank you for replay back really appreciate, the shop is about 15 min from my house and drive the car least 10 minutes stop the car and shut down engine, wait a minute then start again and drive for another 5 to 10 minutes then go to the shop. this is driving on regular traffic or freeway and how do I know if the cat monitor is complete.. thanks
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Old 07-08-2017, 01:57 AM
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You need to scan ECM with a code reader. Most code reader has a Inspection Monitor Status (I/M). It will show Oxygen Sensor Ok, Evap Ok, CAT Ok..... you either get Ok, Ready or Not ready status. Ask your auto parts store near you if they would scan computer. If they do, ask them to Select I/M Status because you want to make sure all items are Ok or Ready for your Smog Clearance.
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Old 07-11-2017, 10:34 AM
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Thanks so much for helping me to resolving my car problems and well I ending buying OBD2 and after reading the instructions the actron read evap, Oxygen sensor ok, but cat still not complete(inc), after been driven the car for 3 days on freeway and streets still not complete, please Benny any other suggestions do I need to replace the oxygen sensors from catalyst location which I believe there are two. Thanks you so much.
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Old 07-11-2017, 01:49 PM
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I did replace my O2 sensors even though I didn't get the DTC simply because it was getting close to its life cycle of 100k miles. I don't know what your mileage is if the O2 sensors have been replaced. The O2's can still be functioning hence no DTC but not at the desired efficiency level. Yes, the CAT looks to efficiency level of Pre-CAT and Post-CAT sensors. That said I would replace the pre-cat and post-cat.
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Old 07-11-2017, 05:31 PM
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Thanks benny my car has 172k and never been replaced and I will get the o2 sensors tomorrow at advanced auto parts the price are really high but in order to have the cat ready I will pay the price and will be in contact with you soon, I hope not need to replace the cat converter after replace the 02 sensors. Thanks for your time benny
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Old 07-11-2017, 09:06 PM
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In that case use NGK/NTK.
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Old 07-18-2017, 09:47 AM
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Hi benny, first I want to say thank you for been to kind to helped with my car issues and well after been struggling with my car finally installed the O2 sensor both of them that is not easy and need special socket to remove them. Well I was ready to drive the car and for two day driven over 300 miles to complete the driving cycle, still not pass the cat monitor the others has been set but not this one and also after at home I connect the obd2 to see if the drive cycle was complete and I got a big super sad news that now have the code p0420 bank1 and po430 bank2 all pending, men am so frustrated I really don't know what I did wrong, and for now you are my hope if you have another suggestion will be appreciated. Thanks
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Old 07-18-2017, 11:29 AM
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You've done the right thing replacing the O2 sensors. I don't know the maintenance history but we're beyond that now. I won't rush to replace the CAT right away. If you're due for oil change go ahead and do that. Continue to drive as you're doing for say 2-3 days and see if the MIL light will come on. According to you the DTCs are pending after you've driven 300 miles. So erase the DTCs and see if they return.
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Old 07-18-2017, 11:36 AM
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Ok will do that thank you, I will in contact with you soon. And also forgot to mention that the battery was dead and I went to advance auto parts to recharger it and the told me the was the alternator and replaced and now is working fine I rwill ally don't know if that have to be the problem with the cat pending codes also the oil was changed two weeks ago. What you do think?
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Old 07-25-2017, 03:07 PM
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Hi benny.. sorry to still borer you with my car problems, but you ar been so kind helping me to resolve my car issues, well after been driving the car for another week still can set the catalyst monitor to ready status at this point I really don't no what to do, i resets the faulty catalysts codes and didn't come back all others monitors has been set. I heard something about the O2 sensor adapter simulator helps to set the cat monitor to ready, really don't know if that's true, please help me. Thanks
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  #13  
Old 07-25-2017, 05:46 PM
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Have you done a OBD2 Drive cycle?
If you have not I would do a quick search and print the process.
That may be why the monitor is not clearing.
Evap and catalyst are always the last to clear,
I believe evap is first then catalyst is last
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  #14  
Old 07-25-2017, 08:10 PM
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It is possible you have not completed a drive cycle tho you've driven the car for a week. So try again and this time have your code reader hooked up. If you have someone do the driving the better while you're in passenger seat monitoring the I/M readiness status. Don't stop until all items says Ok or Ready. The upside is the Pending P0420 and P0430 did not return after you've erased them. Also check on Youtube for videos that might help you.
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  #15  
Old 07-25-2017, 08:24 PM
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Hi soapmyster I found a drive cycle but am not sure if have the correct one, and indeed am been driving that cycle many a least 12 times at nite time when not a lot traffic going on freeway and will be so nice if you can do that for me, I took the obd2 when was driving one nite for a least 1 hour and the o2 was the first and then evap and the last cat converter still incomplete, don't know if I have to repeat the whole driving cycle or just the freeway cycle to have the cat to set. I can't waste more money on a new catalyst if not necessary but thanks to you guys am really appreciate your support. Thanks
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