I have a 2006 Toyota Sienna with a P0430 error (Catalyst System Efficiency Below Threshold Bank 2) . Using BlueDriver, and checking Mode 6 information, it shows a red X next to “Rich to lean threshold voltage (constant), ID: 01 02 N/A, Acceptable Range: – – 0x-80, VALUE: 0XAO”.
Yesterday, I took a trip to NYC and back (237 miles freeway driving). When I got home, the Check Engine light (CEL) was off. I used the BlueDriver to check. No codes. No pending codes. Also, the red X next to “Rich to lean threshold voltage (constant)” was replaced by a green check mark, and the VALUE was now 0x00.
After doing some local driving this morning, I still didn’t have a CEL. I scanned with AutoEnginuity and saw that P0430 was now pending. BlueDriver again showed a red X next to “Rich to lean threshold voltage (constant)” in the Mode 6 data.
AutoEnginuity shows the O2 sensor (B2S2) not staying constant, but oscillating. This would indicate that the Cat is bad. If the CAT is bad (with the P0430 code), why would the code disappear after freeway driving?
Thanks
those stupid codes can come and go as a vehicle ages sometimes even changing the type of gasoline or doing on long trips can make a cold go away if it runs fine I would personally ignore it
@scottykilmer
Thanks! Looking at Short Term Fuel Trim on Bank 2, is starts off at 10.14% @ 815 RPM. As I increase RPMs, the STFT goes to the upper teens and tops out at 20.28% for the 60 seconds at high idle before dropping back down to 7.8% @ 600 RPM.. Could the high STFT @ 20%+ be tripping the P0430? Thanks!