[Aquaman53]

Thanks Apex! I appreciate your help, and your time.

[Aquaman53]

Well, it finally happened today. After 120 miles since my 237 mile NYC trip, the P0430 code returned. I was able to connect the AutoEnginuity and get the Freeze Frame for DTC P0430.

Freeze Frame for DTC P0430

Is there any information in the data that would indicate what caused the PENDING P0430 to trip the Check Engine Light?

[Aquaman53]

Matt, several days ago, I took the Sienna for a drive, with the AutoEnginuity connected, and viewing the Bank 2 sensors. As I was driving, the Bank 2, Sensor 2 was nice and steady – no oscillation. Does this indicate that sometimes there is catalyst activity and sometimes there isn’t? Since the CEL (with the P0430 error) disappeared after the 237 mile trip to NYC 9 days ago, the CEL has not come back (even though it has been pending for about 7 – 8 days).

[Aquaman53]

Sorry! I’ll try this way;

2006 Sienna Fuel Trim

Thanks!

[Aquaman53]

Thanks Apex! My first inclination after watching Matt’s P0430 video was that the cat needed to be replaced. Since the cat is supposed to last the life of the car, and this 2006 only has 160,000 miles, I figured something contributed to the cat going bad prematurely possibly damaging it.

What threw a wrench into this train of thought was that if the cat was physically damaged, how did the P0430 code clear itself with the highway driving? Wouldn’t it indicate that the cat may not be damaged, but possibly contaminated (oil, coolant, etc.)? Regardless, I need to find out the cause what caused the damage / contamination before replacing the cat. My next emission inspection is not until July 2021, so I have some time.

2006 Toyota Sienna Fuel Trim AutoEnginuity report2006 Toyota Sienna AutoEnginuity Fuel Trim report

The above link contains the AutoEnginuity Fuel Trim report showing STFT & LTFT for both Bank 1 and 2, RPM, and coolant temp.

Thanks for the fuel trim clarification. I appreciate your help.

[Aquaman53]

The STFT is better on Bank 1. When it gets to 20% on Bank 2, it’s only 12 or 13% on Bank 1. The P0430 code is the only code. No misfire codes. No drivability issues. The downstream O2 sensor oscillates wildly, instead of being steady.

This weekend, I plan on smoke-testing the vacuum and exhaust systems. It does look like Bank 2 is running leaner than Bank 1. Intake gasket maybe?

There were just STFT. The LTFT on Bank 1 about 8.5% at idle, and < 5% at 2,700 RPM. LTFT is a lower percent on Bank 2 than Bank 1. Bank 2 LTFT goes as low as .78% at 2,700 RPM.

Thanks!

[Aquaman53]

Thanks Apex! Yesterday, I was able to record and pull a report from the AutoEnginuity, for STFT and LTFT (for Bank 1 and 2), along with RPMs and Coolant Temperature. 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 (2,700 RPM) before dropping back down to 7.8% @ 600 RPM.. Could the high STFT @ 20%+ be tripping the P0430? Thanks!

[Aquaman53]

Woefman, he clipped the amp probe around the positive battery cable, at the battery. When placed around the battery cable, the clamp has to be completely closed. There should also be an arrow on the clamp indicating the direction of the flow of current from the battey.

[Aquaman53]

Wolfman, he clipped the amp probe around the positive battery cable, at the battery. When placed around the battery cable, the clamp has to be completely closed. There should also be an arrow on the clamp indicating the direction of the flow of current from the battey.

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