reading po420 freeze frame data

[briang0]

I have a 99 Solara with 272k on it. Last year I replaced O2 sensors and had a new cat put in. 10k miles later I have the PO420 error back again. The freeze frame data reads as follows:

DTC that caused PO420
Fuel System 1 stat Closed Loop
Fuel System 2 stat Closed Loop
Calculated Load Value 29.8%
Coolant Temp 181 F
Short Term Fuel Trim - Bank 1 .8%
Short Term Fuel Trim - Bank 3 9.4
Long Term Fuel Trim - Bank 1 .8%
Long Term Fuel Trim - Bank 3 10.2
Short Term Fuel Trim - Bank 2 .8%
Short Term Fuel Trim - Bank 4 10.9
Long Term Fuel Trim - Bank 2 -.8%
Long Term Fuel Trim - Bank 4 10.2
Engine RPM 1505
Vehicle Speed Sensor 40 MPH
Intake Air Temp 80.6 F

The cat was replaced with a After Market Cat I'm hoping it's not the problem. The car runs fine just the CEL is on. If I reset it it comes back on the next time I drive it. Any assistance would be greatly appreciated.

[TheGreenDutch]

that code is the bane of my existence. Sounds like the aftermarket cat doesn't please the computer. 272k wow...talk about getting your monies worth. I hope mine can make it to 200 with no major problems...155k now...seems like a baby compared to yours....A true testament to toyotas superior craftsmanship...

[ThurzNite]

I'm at 210k miles, I've replaced all 3 o2 sensors. Did you replace all of yours?

Do you have any exhaust leaks?

Ever have an issue with coolant temp sensor?

I dunno why Toyotas are picky about cats, but this thread is similar to yours: http://www.obd-codes.com/forums/viewtop ... f=1&t=6829

And another thread about cleaning the MAF
http://www.obd-codes.com/forums/viewtop ... f=1&t=5889

Dr J