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2007 DTS
2007 DTS, 1991 Eldorado, 1999 Deville (retired)
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371 Posts
Discussion Starter #1
My 99 Deville is throwing the P0741 code. I cleared the code and took it to be tested and I was rejected because the OBD was not ready. How far do I have to drive it or let it idle before the OBD is ready? They told me to drive it for a couple of weeks or take it to a service repair facility to have it checked out. Any soggestions?
Thanks in advance,
Bill.
 

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'98 STS (RIP @ 206,xxx miles)
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4,854 Posts
To get ready for an emissions test I try to drive the car far enough to get the coolant temp. into the thermostat=open range and give it a few bursts of full throttle operation.

Your particular DTC could be as simple as the brake pedal switches are not adjusted properly. Can you "feel" torque converter lock-up at around 45 MPH under light throttle??
 

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1989 Fleetwood FWD / 2000 ETC / 2000 STS / 2006 STS V-8 1SF RWD
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475 Posts
Hello...
It also took me around 300 miles so the system was "ready".
Just drive the car for a few days and be sure not to disconnect the battery as this, too, will render the car as "not ready to test".

Think about it...if all anyone had to do to pass their emission test is reset their computer, then ALL CARS WOULD PASS- even those that should not.
It is just a system of "checks and balances".

Post back what you discover.
 

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2007 DTS
2007 DTS, 1991 Eldorado, 1999 Deville (retired)
Joined
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371 Posts
Discussion Starter #5
I did the light throttle and brake test and I can feel the converter working. What kind of adjustments to the brake pedal are you talking about? Do you think they will fail me if I leave the P0741 code in the OBD?
 

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1995 Sedan Deville Spring Edition
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268 Posts
Well,

Maybe someone else here can correct me if I am worng, but I am of the impression (at least here in Missouri) that the only codes that will fail emmisions testing on OBDII are ones that cause the "service enigne soon" and or "service vehicle soon" to light up. Not all codes will cause a MIL to light up, as many codes are not powertrain or emissions related. Thus, the car may pass emissions if this is true, and the code you have doesn't set an MIL to an "ON" state.

Anyone else here know for sure? MY car is OBDI (thankfully) so none of this applies, and I passed emmissions through the mobile "sniffer" van that the state sets up here on highway on ramps, so I never had to go and get it tested.

I know that this program varies from state to state, so the ground rules may not be the same where you're at. Of course, the one thing that is true everywhere is that clearing the codes just prior to testing will tip off the testing station during the OBDII test and will automatically fail the car. There has to be a certain amount of history data stored for the test to proceed.

KDirk
 

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1989 Fleetwood FWD / 2000 ETC / 2000 STS / 2006 STS V-8 1SF RWD
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475 Posts
Hello...
You are correct...(at least for GA and MO).
The only codes which will cause emission test failure are those codes directly related to emission controls.
I have been tested with other codes present and still passed.

Post back how this turns out for you.
 

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2007 DTS
2007 DTS, 1991 Eldorado, 1999 Deville (retired)
Joined
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371 Posts
Discussion Starter #8
They failed me with the P0741 code. Said it was emissions related. I reset the OBD and drove it around 200 miles in 3rd gear to avoid the P0741 code and took it back and passed!
 
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