The window of opportunity is often only a few seconds.  It will be on when
the car thinks its warm.

And, what's your problem with running a clean car?  It seems to me like you
need a new cat, so get a new cat.  Or get a new f.cking car (which will have
a new cat).

If you are looking for excuses or a way to cheat the systems put in place to
prevent asstards like you from f.cking up my ability to breathe, maybe you
should consider f.cking off.  Go back to mexico you cheap a.s beaner piece
of sh.t.

It seems to vary.  Mine's getting shorter.  

Once you clear teh code, it resets counters that take time to become
valid.  So, don't think you can clear the code and then go have your
emissions tested -- you won't pass if the sensors/tests that require a
longer time period to become "ok" aren't yet in that state.

It seemed like you needed about oh... 25 miles or so after clearing
codes to get clear.   When I first started fighting p0420 that time
window of being  clear before anothe rcel would set was about a
month.

Now, the window is getting smaller or non-existent.   I need a new
cat, myself, apparently.   I certainly don't want to be poluting but I
also don't want to be throwing money on what might be a false
indication of a problem.

--
Todd H.
2001 Legacy Outback Wagon, 2.5L H-4
Chicago, Illinois USA

There are dozens. Here is the largest group...

P0130      O2 Circuit (Bank 1, Sensor 1)
P0131     O2 Circuit Low Voltage (Bank 1, Sensor 1)
P0132     O2 Circuit High Voltage (Bank 1, Sensor 1)
P0133     O2 Circuit Slow Response (Bank 1, Sensor 1)
P0134     O2 Circuit No Activity Detected (Bank 1, Sensor 1)
P0135     O2 Heater Circuit (Bank 1, Sensor 1)
P0136     O2 Circuit (Bank 1, Sensor 2) (See P2270, P2271)
P0137     O2 Circuit Low Voltage (Bank 1, Sensor 2)
P0138     O2 Circuit High Voltage (Bank 1, Sensor 2)
P0139     O2 Circuit Slow Response (Bank 1, Sensor 2)
P013A     O2 Sensor Slow Response - Rich to Lean (Bank 1, Sensor 2)
P013B     O2 Sensor Slow Response - Lean to Rich (Bank 1, Sensor 2)
P013C     O2 Sensor Slow Response - Rich to Lean (Bank 2, Sensor 2)
P013D     O2 Sensor Slow Response - Lean to Rich (Bank 2, Sensor 2)
P0140     O2 Circuit No Activity Detected (Bank 1, Sensor 2)
P0141     O2 Heater Circuit (Bank 1, Sensor 2)
P0142     O2 Circuit (Bank 1, Sensor 3)
P0143     O2 Circuit Low Voltage (Bank 1, Sensor 3)
P0144     O2 Circuit High Voltage (Bank 1, Sensor 3)
P0145     O2 Circuit Slow Response (Bank 1, Sensor 3)
P0146     O2 Circuit No Activity Detected (Bank 1, Sensor 3)
P0147     O2 Heater Circuit (Bank 1, Sensor 3)
P0150     O2 Circuit (Bank 2, Sensor 1)
P0151     O2 Circuit Low Voltage (Bank 2, Sensor 1)
P0152     O2 Circuit High Voltage (Bank 2, Sensor 1)
P0153     O2 Circuit Slow Response (Bank 2, Sensor 1)
P0154     O2 Circuit No Activity Detected (Bank 2, Sensor 1)
P0155     O2 Heater Circuit (Bank 2, Sensor 1)
P0156     O2 Circuit (Bank 2, Sensor 2) (See P2272, P2273)
P0157     O2 Circuit Low Voltage (Bank 2, Sensor 2)
P0158     O2 Circuit High Voltage (Bank 2, Sensor 2)
P0159     O2 Circuit Slow Response (Bank 2, Sensor 2)
P0160     O2 Circuit No Activity Detected (Bank 2, Sensor 2)
P0161     O2 Heater Circuit (Bank 2, Sensor 2)
P0162     O2 Circuit (Bank 2, Sensor 3)
P0163     O2 Circuit Low Voltage (Bank 2, Sensor 3)
P0164     O2 Circuit High Voltage (Bank 2, Sensor 3)
P0165     O2 Circuit Slow Response (Bank 2, Sensor 3)
P0166     O2 Circuit No Activity Detected (Bank 2, Sensor 3)
P0167     O2 Heater Circuit (Bank 2, Sensor 3)

And here is the group of cat codes...

P0420      Catalyst System Efficiency Below Threshold (Bank 1)
P0421     Warm Up Catalyst Efficiency Below Threshold (Bank 1)
P0422     Main Catalyst Efficiency Below Threshold (Bank 1)
P0423     Heated Catalyst Efficiency Below Threshold (Bank 1)
P0424     Heated Catalyst Temperature Below Threshold (Bank 1)
P0425     Catalyst Temperature Sensor Circuit (Bank 1, Sensor Circuit 1)
P0426     Catalyst Temperature Sensor Circuit Range/Performance (Bank 1, Sensor
Circuit 1)
P0427     Catalyst Temperature Sensor Circuit Low (Bank 1, Sensor Circuit 1)
P0428     Catalyst Temperature Sensor Circuit High (Bank 1, Sensor Circuit 1)
P0429     Catalyst Heater Control Circuit (Bank 1)
P042A     Catalyst Temperature Sensor Circuit (Bank 1, Sensor Circuit 2)
P042B     Catalyst Temperature Sensor Circuit Range/Performance (Bank1, Sensor
Circuit 2)
P042C     Catalyst Temperature Sensor Circuit Low (Bank 1, Sensor Circuit 2)
P042D     Catalyst Temperature Sensor Circuit High (Bank 1, Sensor Circuit 2)