Evaporative monitor not working after cat converter replacement and driven 200 miles or more.

why did you had the Cat change? cat converter it the heart for emission control
you had to change all the O2 sensors
Scan the car and see if all the o2 sensor are working when the car is operating temperature
after this you can see what is happening with the car and emission

can be a bad cat /sensor / computer or wiring usually takes about a 100 to 125 miles on most vehicles to reset after clearing a code dead battery or replacing battery but thats if all systems are working properly if it was reset because of a code and that part of system hasnt reset than more than likely a problem with a component or system from original code

Replacing Spark Plugs & Ignition Coils
does not require any clearing of codes

You have 8 monitors on most vehicles

5 Monitors do not run all at one time

If the Catalyst fails when it does run, then you
may have not replaced the front O2 Sensors
at 100,000 or one failed
Have to use professional scan tool to look at data
& see if the I/M Monitors have run

The Evap is the last to run & there is no info avail
as to when it runs, as far as I know

The Evap will run once or twice a week-maybe

The cat should run by 50 miles of driving or a couple
hours run time

From 2002 until now-- I doubt the converter has much life left,
but the monitor will still run.

Look at scan tool misfire on Mode $06,O2 Data,Fuel Trim
and such, after a road test of 25 miles,then component test
anything not as it should be.

If you keep using your code reader to clear DATA- forget the codes,then your monitors,freeze frame & such are gone,thus your current situation.

Try disconnecting your battery and recoonnecting.

200 miles is more than enough. p0420 is a cat code meaning the cat in the exhaust is not doing its job. you need to make sure there are no exhaust leaks before the downstream (last one) o2 sensor. if you can get all but 1 monitor to set without the check eng light coming on, you will pass pa emmissions.

The converter is 13 years old

It won't be too effective by now,
so you may want to consider replacing it

First have a repair shop check your O2 Sensors

The front ones get replaced at 100,000 miles

The rear ones are your Monitor ones you have
an issue with. They may be shot by now

Don't always need a MIL Lamp on dash to have
worn out parts

There are no monitors for O2 Sensors

You must have other issues effecting
the sensors

If your cats are 15 years old,then there
is your problem. No Efficiency,Replace
worn out cat

Let's see if I got this right.The vehicle can't be driven because of legal issues with the emissions test, and it has to be driven 200 miles before it can be tested. Talk about your catch 22. Jack that thing up, put it on jack stands, fire it up, put it in gear, and watch the miles add up.

You're going to have to have the codes read and find out what is setting that light on. After that problem is repaired, the car must indeed complete a drive cycle, not nessacarily 200 miles. This lets the computer run all it's tests and set all its readiness monitors. If you know what the code number is now, post it and I'll tell you the most likely cause, and repair.

The P0420 code, usually associated with a weak cat converter, is in fact often caused by an ageing (weak) downstream O2 sensor. On both my cars at around 150K miles replacing the downstream O2 sensor was all that was needed to clear the code. No cat replacement was necessary. If one actually spends some time reading the diagnostics procedure for this code, they will find that the O2 sensor diagnostic is the first thing to do before replacing the cat converter. The downstream sensor, the one after the cat converter, gets "lazy" with age. This means that it no longer produces voltage signals as it used to. The result is that the voltage swings that come out of it begins to follow very closely the voltage that is generated by the upstream O2 sensor. When this happens, the car computer thinks the cat converter does not do its job (which might as well be the case too, but the O2 sensor is the first thing to try). With a code scanner with live data stream you can see the voltages coming from the O2 sensors. Check-out my write-up on the 2002 Toyota Prius cat converter replacement on http://www.pbase.com/kocho/exhaust_prius
- I got some details there. And see my comment for Dennis above here too