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2007 Dodge RAM 1500 - O2 sensor and Catalyst not ready

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  #1  
Old 09-17-2012, 08:07 AM
coolram coolram is offline
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Default 2007 Dodge RAM 1500 - O2 sensor and Catalyst not ready

2007 Dodge HEMI 5.7L RAM 1500 Sport Grey
My 2007 Dodge did pass emmision inspection since it had O2 sensor and catalyst not ready. Since I drove more than 400 miles but it still has not cleared. It has no other error codes nor 'check engine' message. Yesterday I took it to the dealership. Today I was told that we could not help you. Service guy told me that at their dealership, he has seen this second time in last several years. He advised me that you simply have to keep on driving and gave me some criteria as to speed RPM etc. The truck has only little over 54000 miles.

Please help me if someone has been through this problem.

Thanks
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  #2  
Old 09-17-2012, 09:58 AM
Izero Izero is offline
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I am assuming you meant to say you "Didn't pass inspection"

Have you used an aftermarket tuner on the truck?

Have you replaced both the Upstream & Downstream O2 Sensors?
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Old 09-17-2012, 03:45 PM
coolram coolram is offline
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Izero,

Thanks for the reply.
Yes, It didn't pass the inspection. I have not replaced any of the sensors. I have not used any aftermarket tuners either. There is no check engine light nor any error codes. I have my OBDII Actron and it keeps on showing 'INC' for those 2; O2 and Catalyst sensor.
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Old 09-17-2012, 04:09 PM
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so replace the sensors and see what happens... that would be my starting point...
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Old 09-17-2012, 06:25 PM
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Dont buy the sensors at the parts store save yourself some money get them at ROCKAUTO.com. Make sure you stick to the original brand of the sensors or you could end up with more problems
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Old 09-17-2012, 07:20 PM
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I wouldn't replace the sensors until you know they're bad. You'll know a sensor needs replacing when the PCM actually conducts the test on the sensors and pops the CEL on. By replacing a sensor, it will not speed up the test of the sensor. The tests of the systems, or sensors, only gets done after certain driving situations. Meaning both city & highway driving, or whatever Dodge requires before the test will be conducted.

I had the same problem on both my car & truck last year, same two sensors. The truck I got through on the second try, but my car was another story. I got it to pass on my fourth try! I forgot how many miles it was, but what a PITA.

Don't worry, you'll either get the CEL or pass inspection, hopefully the latter.
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Old 09-17-2012, 09:51 PM
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So, to be clear, they wont pass your inspection because the sensors are showing incomplete status, not because they actually somehow found a problem with your catalytic system. If you havent installed new sensors, then your battery had to have been disconnected at some point in recent history. Does that ring a bell? When you do that, things get reset and have to complete a "drive cycle" before they will start reporting problems, if there are any. But inspection stations that are required to check emissions cant pass you when the sensors read inc because every person with a real problem would just disconnect the battery right before going in for an inspection. Normal driving will eventually complete a drive cycle but, if you can find out what the drive cycle is, sometimes you can follow some steps and force it sooner than later. The link below contains information like what i am describing but i dont know if they are the steps that will work on your truck. I replaced a sensor on my old 4runner once and tried to force the drive cycle to complete following similar steps but could never get it to work. It eventually completed on its own.

http://img.neons.org/archives/chrysler_drive_cycle.pdf
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Old 09-18-2012, 09:23 AM
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Thank you all for the help. As mentioned, I have to do some highway driving to complete the cycle which then may clear the incomplete error message. The battery terminal connector was rusted and broke off disconnecting the power, and since then I have only done city driving and probably have driven 500-600 miles total but not like 100 miles at constant RPM and speed. I think what 04HemiGreg stated makes sense. Thanks again.
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Old 09-18-2012, 09:43 AM
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That isn't 100% correct, he failed because of a failure to pass the "readiness test" which is most of the time indicative of a failing or failed O2 sensor. (of course other sensors can cause be at fault too)

He is correct that if the PCM's short term memory was erased (by resetting the PCM or disconnecting the battery) the computer will NOT perform the readiness check.

But you stated that you drove through a complete heat cycle (20-50miles) which should have been more than enough for the computer to adjust its fine learning trims and begin the readiness checks.

http://www.nyc.gov/html/tlc/download...fact_sheet.pdf

That is a little fact sheet that will help explain what I am summarizing here.

You might not get a DTC (aka CEL) if your sensors fail the readiness check, because they might still be reporting valid voltage/amperage readings.

The inspection station should have given you a failure report after they performed the inspection, it would help us help you if you can post that up so we can see which sensor or sensors failed the readiness check.
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Old 09-18-2012, 11:04 AM
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Quote:
Originally Posted by coolram View Post
Thank you all for the help. As mentioned, I have to do some highway driving to complete the cycle which then may clear the incomplete error message. The battery terminal connector was rusted and broke off disconnecting the power, and since then I have only done city driving and probably have driven 500-600 miles total but not like 100 miles at constant RPM and speed. I think what 04HemiGreg stated makes sense. Thanks again.
If you have done 500-600 miles i would just start with sensors
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Old 09-18-2012, 12:48 PM
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Keep in mind if you do swap sensors, you will still have to complete a drive cycle before going in for another inspection. If it were my truck, I'd try to find the correct drive cycle steps, follow them, and then only change sensors if they still show inc.
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Old 09-18-2012, 12:51 PM
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Quote:
Originally Posted by 04HemiGreg View Post
Keep in mind if you do swap sensors, you will still have to complete a drive cycle before going in for another inspection. If it were my truck, I'd try to find the correct drive cycle steps, follow them, and then only change sensors if they still show inc.
Thats a better idea!
Good luck finding the exact Driving Cycle though, i personally havent looked into detail but ive read many places its so many miles here so much idiling there to many different answers
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Old 09-18-2012, 04:14 PM
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post the inspection report they should have given you, it will tell you which sensors didn't pass the readiness test.

In most states, any car beyond 2001 will fail if 2 or more sensors fail the readiness check.
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Old 09-18-2012, 08:28 PM
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The drive cycle is not as simple as "drive x number of miles". I wish it was. I think the thought process is "drive x miles and the cycle is likely to complete somewhere within there". But if you look at drive cycles that are available online, you can see that they involve different speed ranges and driving conditions. So, while one person may drive 100 miles of varied conditions and get it to complete, another may drive 300 miles down the interstate at 70mph and not get a completed cycle.
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Old 09-18-2012, 09:54 PM
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Im going to start doing so searches!
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Old 09-19-2012, 11:17 AM
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Im glad we dont have those inspections here.

I replaced all my O2s some time back. Not because they failed or a CEL but because of age more than mileage. Im only now flipping 86k on my 04

But I bought the $25 Bosch sensors from AutoZone and they worked fine. I still dont have any CELs or any issues.
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Old 09-19-2012, 12:05 PM
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I used the same ones and both threw a code as soon as i hooked the battery up and started the truck.
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Old 03-14-2013, 01:52 PM
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Same thing happened to me at DEQ. I got a "not ready" on the catalyst. They told me their computer was reading my Cat. I recently disconnected the battery because my CEL was on. I did the turn the key on and off trick and got 2 codes, P0440 and P0441. When I disconnected my battery my CEL went off. I drove around both city and highway for about 50 mile total before going to DEQ. Any thoughts??
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Old 03-14-2013, 02:29 PM
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would help to know what year and model truck you have... as well as if you have any modifications...
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Old 03-15-2013, 11:01 AM
Dublel240 Dublel240 is offline
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Oh sorry. It's a 2003 Durango 4x4 no mods. And in my post it should have read - "the computer did NOT recognize my catalyst". I understand now that I must not have completed the drive cycle. Now a few days later the CEL is back on. It's throwing codes: P0440 & P0441. After some research, I believe it will be the hoses just in front of the gas tank or right next to the battery. If anyone has had these codes before and can throw some info my way, it would be much appreciated. Thanks all!
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Old 03-15-2013, 11:01 AM
 
 
 
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