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if you have a code for the precat, ie P0420 or P0430 chances are you will not pass emmisions since this is an emmisions device and code.
you might try clearing the code the day before and drive the car, and hope then it doesn't come back until after your emisions testing.
the mil eliminators will allow you to pass testing.
- 95 Mystique LS - Zetec/5spd
- 99 Contour SeVT Sport - Duratec/5spd
Official NE-CEG Contour/Mustang Family
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Originally posted by BrApple:
...you might try clearing the code the day before and drive the car, and hope then it doesn't come back until after your emisions testing.
...
If you do this, make sure you go through the OBD II cycle before showing up for emissions testing or you will fail for a "not ready" code.
The OBD II drive cycle is in the Owners' Manual.
Download a copy from www.fleet.ford.com
In addition, you can find the OBD II drive cycle here.
http://www.obdii.com/drivecycleford.html
This will describe the Inspection/Maintenance monitors and the OBD II drive cycle.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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Originally posted by Tony2005:
If you do this, make sure you go through the OBD II cycle before showing up for emissions testing or you will fail for a "not ready" code.
guess I wasn't clean on that, this is why i suggested doing it the day before and not right before the emissions test
- 95 Mystique LS - Zetec/5spd
- 99 Contour SeVT Sport - Duratec/5spd
Official NE-CEG Contour/Mustang Family
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Dang.. that's a lot of work  Not really. the MIL Elims will be a long term fix. I think i'll go that route. Man.. i love forums, i don't know crap about cars and you guys make it easy!
99 SVT Black/Midnight
1462 out 2760
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The day before is unlikely to be helpful.
My 98 took 3 weeks to clear the P1000....
FWIW, the cat efficiency codes won't cause the PCM to go into any mode that uses more fuel.....
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!
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Originally posted by BrApple:
drop in gas milage is because of the CEL, so getting mil eliminators to turn the CEL off will improve gas milage, headers could but not if you have a heavy right foot and like how your car sounds at WOT 
Originally posted by projectsho89:
FWIW, the cat efficiency codes won't cause the PCM to go into any mode that uses more fuel.....
Steve
so which is it?       
99 SVT Black/Midnight
1462 out 2760
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Originally posted by ChiliSVT:
Originally posted by BrApple:
drop in gas milage is because of the CEL, so getting mil eliminators to turn the CEL off will improve gas milage, headers could but not if you have a heavy right foot and like how your car sounds at WOT
Originally posted by projectsho89:
FWIW, the cat efficiency codes won't cause the PCM to go into any mode that uses more fuel.....
Steve
so which is it?
The second answer is correct.
Jim Johnson
98 SVT
03 Escape Limited
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i had P0420 and the cel went off like 2 days later. should i worry about this or since the cel went off am i alright?
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Originally posted by racerm515:
i had P0420 and the cel went off like 2 days later. should i worry about this or since the cel went off am i alright?
you are ok for now but it will come back at some point
- 95 Mystique LS - Zetec/5spd
- 99 Contour SeVT Sport - Duratec/5spd
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Originally posted by racerm515:
i had P0420 and the cel went off like 2 days later. should i worry about this or since the cel went off am i alright?
Probably.
Many times when this code sets, it is a false positive. Ford eventually partually addressed this issue with a reflash on some of the cars effected. The reflash widened the parameters for setting the code. My car was not one of them with a new PCM code.
I would speculate that ocassionally when the cat monitor in the PCM runs that the pre cat may not be hot enough.
I'll give you an idea about how the cat ineffeciency codes are set. The cat effeciency monitor only runs ocassionally, not all the time. It is the last of the monitors to run, and even then only after certain driving conditions have been met. When the cat monitor runs, it compairs the readings of the upstream oxygen sensors to the downstream oxygen sensors. The upstream oxygen sensor is before any cat. It switches rapidly from lean to rich with the pulses set up from the opening of the exhaust valves. A proper performing cat will even out the rich/lean switching. The downstream oxygen sensor is after the cat. The PCM compares the upstream readings with the downstream readings, and if the downstream readings nearly mirror the upstream readings, the code is set and the CEL is illuminated.
What can you do to minimize the likelyhood of the cat monitor codes? Proper maintenance helps. Clean injectors, good plugs and wires, clean valves, and a clean combustion chamber may help a lot. A slightly lazy upstream oxygen sensor may also contribute. So it helps to ocassionally run a good injector cleaner through the tank, do the vacuum suck intake cleaning, make sure the ignition system is in good shape, confirm that the air filter is in good shape, drive in a spirited manner, and if there is any question about the condition of the upstream oxygen sensor, change it.
That may not keep the cat effeciency codes from ocassionally setting, but if it is only ocassionally there should be no trouble.
Even though my car has ocassionally set those codes, it still has the original pre-cats, and on an emissions test the readings are nearly zero, much lower than would be possible if only the main cat (which is downstream of the downstream oxygen sensors) were all that was working.
I do believe in agressive maintenance which includes frequent injector cleaning as well as new plugs every 60,000 miles. Beyond my agressive maintenance schedule I did replace both upstream oxygen sensors a few months back when the #1 bank set and kept repeating a code. The cat effeciency codes have not come on since, but I don't know if it is related since it is an infrequent event anyway.
I hope this helps.
Jim Johnson
98 SVT
03 Escape Limited
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