Question about 1998 Ford Expedition

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Emission system problem

Will not pass Pennsylvania emission inspection. Have done everything the inspection garage told me to do. Check engine light is off and have now driven 800 miles and the engine analyzer computer still says that the OBD is not ready to test on 3 areas.Catalyst,EGR.and 1 other. The origional problem was EGR flow low.





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  • cuzzmo Jan 31, 2009

    All the sos pads did was reduce engine power, and caused it to use too much gas.

  • Anonymous Mar 19, 2014

    how many miles does car need to be driven before system is reset

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Fill your muffler with SOS pads just before your test a wire coat hanger can remove them after the fact..
good luck its how i got my prelude to pass inspection in vancouver bc canada

Posted on Jan 16, 2009

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Evap system problem, 2008 silverado extended cable 5.3 Flexfuel check engine light is off, but, the scanner is showing evaporative system , no code, only yellow light, it won't pass the emissions. I a


Did the garage check the gas cap during the emission test? 90% of the time an evap leak turns out to be a bad gas cap. Or if someone had gas cap off while engine was running (pumping gas). Or if gas cap was not tightened all the way while driving. If this is the case, code saying evap leak, will clear after drive cycle self tests are done. Usually after 50 miles or more.(if the leak is solved)

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Tip

I get OBD codes P0420 and P0430



P0420 and P0430

P0420 means Catalyst System Efficiency Below Threshold, Bank 1

P0430 means Catalyst System Efficiency Below Threshold, Bank 2

It means that the O2 sensors are good, and the O2 sensors are telling you that your catalytic converter, in the exhaust system is not working fine, as its emissions are polluting the air too much.

The catalytic converter is part of the exhaust system. The way to test this part is by doing an emission test. The two OBD codes that you are getting are already a test telling you that the converter must be replaced, unless an emission test done at a garage says the opposite.

This kind of problem will trigger the check engine light, and your car will also waste too much fuel.
You also risk to get in trouble if the car goes through an Air Pollution control, as the car won't pass an emission test in this condition.

To conclude, the Catalyst System must be replaced, the O2 Sensors are fine.

This is a repair that should be done at a garage, however you can find DIY instructions here:How to Replace a Catalytic Converter or you can get more detailed instructions, and step by step illustrated procedure purchasing a repair manual.

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1 Answer

2004 porsche cayenne i reset computer and now it will not start


Clearing Codes, clears all data, then all the emission
monitors have to run again, or you won't be excepted
to inspection

Clearing codes & data,has nothing to do with diagnosing
why you got the fault codes & fixing the problems

How would clearing a dash light help pass inspection?

Before you got down the street two houses, the light would
be back,the car has a failed system ,thus the light on the
dash after the motor is started.

You cleared all data,now a shop can't even work on it
You removed all vehicle history & codes

Flat bed it to a shop & they will make the repairs you neglected
to do, while trying to get hundred miles before the parameters
on a failed system went out of range & the dash light came back

Need to study OBD 2 Systems on the internet & leave the vehicle
work to the pros

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If you look at Honda's maintenance schedule they say that this is something that you should do. But if you just passed smog and the amount of miles on the vehicle I would not do it at all. Its basically a way for the dealership to get more money from you.

This is to make sure that all your emission systems is up to par no leaks, and everything is working correctly. If you where having emission issues you would be having a check engine light come on. I honestly again would not worry about it.

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Every vehicle manufactured in the U.S. has to first pass an Environmental Protection Agency (EPA) test called the Federal Test Procedure. This sets the acceptable limits of wear and/or failure for the emission control system-i.e., what conditions will ultimately cause a Check Engine Light to illuminate. These standards are closely regulated. If the emission control system is faulty and the vehicle is polluting the air, the Check Engine Light illuminates to alert the driver of this condition. (Note: A vehicle in this condition would fail an emissions inspection or smog check.)
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Your gas mileage will suffer and if your state requires an annual emission inspection, you will not pass. There is also a possibility that your catalytic converter's life will be shortened because of improper combustion. Ask the dealer if these component are covered under the emissions warranty.

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1 Answer

When is my 2004 rodeo due for a tune up


P0420 means Catalyst System Efficiency Below Threshold, Bank 1
It means that your catalytic converter, in the exhaust system is not working fine, as its emissions are polluting the air too much.

The catalytic converter is part of the exhaust system. The way to test this part is by doing an emission test. The two OBD codes that you are getting are already a test telling you that the converter must be replaced, unless an emission test done at a garage says the opposite.

This kind of problem will trigger the check engine light, and your car will also waste too much fuel.
You also risk to get in trouble if the car goes through an Air Pollution control, as the car won't pass an emission test in this condition.

To conclude, the Catalyst System must be replaced, the O2 Sensors are fine.

This is a repair that should be done at a garage, however you can find DIY instructions here:How to Replace a Catalytic Converter or you can get more detailed instructions, and step by step illustrated procedure purchasing a repair manual.

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