Follow-up OBD System Test Failure -
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post #1 of 6 Old 01-25-2010, 07:26 PM Thread Starter
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2005 LJ Wrangler 
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Location: Helena, MT
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Follow-up OBD System Test Failure

Hi folks,

On 1-16-2010 I posted a question about the MIL light test indicating the OBD system is not ready for testing.

Got a few helpful replies and have since gotten some new information that I want to share with those of us still fighting the electronincs on our TJs/LJs.

The operation addressed in the Service Bulletin I referenced in my original post, TSB number 18-028-06, has been performed, and the #2 O2 sensor has been replaced; now the P2098 code is no longer present. I had the service advisor at the local Jeep dealer scan for codes, and he confirmed the code was no longer present.

I again told him about the failure of the OBD system to test ready (as I described in my original post), and he did some research looking for a TSB that might address the problem. He found the following Service Bulletin:

Number 25-001-07. Group: Emissions. Date: February 09, 2007.

I'll quote from the first page of the Bulletin:

"Subject: I/M Readiness Check Continues to Indicate OBD System Is Not Ready for I/M Testing.
Overview: This bulletin involves modifying wiring in the Power Distribution Center (PDC).
Models: 2005 - 2006 (TJ) Wrangler
Note: This bulletin applies to vehicles equipped with a 2.4L or 4.0L engine (sales code ED1 or ERH respectively).
Symptom/Condition: Vehicle On Board Diagnostics (OBD) system will not indicate readiness for I/M emissions testing. (See 'Emissions Inspection and Maintenance Programs' in section 7 of the Wrangler owner's manual to determine if vehicle is ready for I/M testing.)
Diagnosis: After turning the igniton key to the ON position without cranking the engine, the Malfunction Indicator Lamp (MIL) should remain illuminated solid. If the MIL flashes for 10 seconds approximately 15 seconds after turning the key to the ON position (without cranking the engine) and then returns to solid illumination, the vehicle is not ready for I/M testing. Perform the Repair Procedure."

The bulletin then goes on to list parts and tools required.

I had the dealer perform the service. Thus far the "I/M Readiness Check Continues to Indicate OBD System Is Not Ready for I/M Testing." The final steps in the repair procedure says that if the vehicle is still not ready for I/M emissions testing, "The vehicle will require further drive cycles. If this condition persists after several days of further drive cycles, then additional diagnosis may be required".

I have not driven the Jeep more than the few miles back from the dealer so far, and the OBD system still tests faulty. When I have put a number of more "drive cycles" on the Jeep, I'll post again to let you know if the light then tests normally.

Hope this helps anyone having this problem.

Oh, and by the way, one of the replies I got from my original post referenced a Service Bulletin number 18-026-06. I mentioned this Service Bulletin to the service advisor, and when he pulled it up he found it did not apply to the TJ. Think he said it applied to Voyager or Caravan. Dodge minivan.

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post #2 of 6 Old 04-15-2010, 02:38 PM
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Any updates on this?

-You're my boy blue!!!!

'79 CJ-5 - 304 V-8
'03 TJ Freedom - a little smaller
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post #3 of 6 Old 04-15-2010, 03:19 PM
Grand Wrangler
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Location: Chicago
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Mine's doing this now. Had my emissions test a month ago and it was fine. It's not giving any codes via the on-off key procedure. (2006 w/ 13K miles)

2006 Rubicon - original owner. 1989 Grand Wagoneer
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post #4 of 6 Old 04-22-2010, 10:01 AM Thread Starter
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2005 LJ Wrangler 
Join Date: Jan 2010
Location: Helena, MT
Posts: 16
Follow-up to the Follow-up/OBD/MIL Test Fault


Check my post titled Follow-up to the Follow-up/OBD/MIL Test Fault.

It basically says it took quite a few drive cycles to reset the computer after the service Bulletin was performed. Have had no problems since.

'05 LJ
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post #5 of 6 Old 04-22-2010, 05:21 PM
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1997 TJ Wrangler 
Join Date: Sep 2001
Location: Santa Clarita, CA
Posts: 304
Mine would not post ready until I put the airbag fuses back in. It took me a looong time to figure that one out because I have had the fuses out for a year or so to let my kids ride in the front.

97 TJ 4.0l
I've gotta stop running into things...
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post #6 of 6 Old 12-17-2013, 03:30 PM
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Join Date: Dec 2013
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I have a 2005 Wrangler, same problem... Took it in today and they said there is a recall on the O2 sensor for that year, and there is a computer update for this problem. They said the recall did not show up until my dealer did some research on why the O2 sensor would not reset and keeps showing not ready. They are doing the computer upgrade now.. Hopefully this fixes the problem.
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