We've a $2.00 part in the S.A.I.S. of the VVT engine, 1s taking-out ~$7,000.00 $15,000 (inflation) in parts. WOW!
I've a very easy and cheap WORK AROUND. You are going to love this
This thread is dedicated to the 4.7L 2UZ-fe VVT engine, in the 2006 & 2007 100 series Land Cruiser & Lexus LX470 manufacture in Japan for the USA market. It is very likely every 2UZ-fe 4.7L VVT engines, will get CAT (Catalytic Converters) DTC (AKA MIL, codes) P0420 (BK1 CAT) & P0430 (BK2 CAT), and likely both will need replacing.
These engine were the first 100 series to have the emission reducing Secondary Air Injection System ( AKA: S.A.I.S. system or A.I.). I'll just refer to as S.A.I. or A.I..
I may be wrong about the whole issue, you decide.
(Edited 9/14/23 in 2021 or thereabouts. Lexus began a company to replace all GX S.A.I.S filters. The TSB points to moisture as possible cause of filter breaking down. I'm now of the opinion that all Toyota & Lexus will need S.A.I.S. filters mod or replacing.
But after 5 years reading about these codes (P0420 and P0430) coming up with no real cause or legal fix found. I spent the last two years on a 100 series 2UZ-fe VVT engine (in my test rig) I bought with CAT & S.A.I. (secondary air injection) issues to understand, find, correct and test a fix in. I've decided, it is time to post my findings in mud.
THIS IS NOT WHY all CAT's FAIL. But it is very likely all in the 4.7L VVT engine will, because of. My modification will save each ih8mud member, with the VVT engine, thousands if I'm right and it keep street legal. For just pennies on the dollar. So cheap and easy!
I've found what I feel is going to take out our CAT's. Unless this legal modification done. The Dealership fix is near $10K (If both CAT and some AI codes pop up), which is a long term fix, but is not likely permanent.
The SAI system will kick off DTC (Diagnostic Trouble Codes) P1442, P1445 and or P2441. Which are the AI switch(s) "stuck closed". These switches typically will test okay, but keep kicking off DTC indicating stuck closed. Toyota has TSB on these. My Toyota parts guy gave me, when I asked about P1442 & P1445 These are for Bk1 & BK2 AI switches, which sit on water bypass joint rear. The TSB, recommends replacing all mechanical parts of AI system, wit a notation * Replace ONLY If damaged by debris. Reuse parts when possible.. Which in 2019 was about $3K in parts, just for SAI stuff. Some block off the S.A.L system, which solves the issue. But, Blocking off S.A.I., is not street legal.
What part am I talking about....Drum roll ........ A small foam filter inside the secondary air injection blower fan (S.A.I. pump)
This bit of foam filter material measures about 15mm x 5mm. Which is only remnants of a AI pump filter found remaining in my test engine.
Here is a factory SAI filter, in good condition, exposed under the top of Secondary Air Injection Pump - Toyota (17610-0C010) (Blower) without bracket, list for ~$600 today.
I've a very easy and cheap WORK AROUND. You are going to love this
This thread is dedicated to the 4.7L 2UZ-fe VVT engine, in the 2006 & 2007 100 series Land Cruiser & Lexus LX470 manufacture in Japan for the USA market. It is very likely every 2UZ-fe 4.7L VVT engines, will get CAT (Catalytic Converters) DTC (AKA MIL, codes) P0420 (BK1 CAT) & P0430 (BK2 CAT), and likely both will need replacing.
These engine were the first 100 series to have the emission reducing Secondary Air Injection System ( AKA: S.A.I.S. system or A.I.). I'll just refer to as S.A.I. or A.I..
I may be wrong about the whole issue, you decide.
(Edited 9/14/23 in 2021 or thereabouts. Lexus began a company to replace all GX S.A.I.S filters. The TSB points to moisture as possible cause of filter breaking down. I'm now of the opinion that all Toyota & Lexus will need S.A.I.S. filters mod or replacing.
But after 5 years reading about these codes (P0420 and P0430) coming up with no real cause or legal fix found. I spent the last two years on a 100 series 2UZ-fe VVT engine (in my test rig) I bought with CAT & S.A.I. (secondary air injection) issues to understand, find, correct and test a fix in. I've decided, it is time to post my findings in mud.
THIS IS NOT WHY all CAT's FAIL. But it is very likely all in the 4.7L VVT engine will, because of. My modification will save each ih8mud member, with the VVT engine, thousands if I'm right and it keep street legal. For just pennies on the dollar. So cheap and easy!
I've found what I feel is going to take out our CAT's. Unless this legal modification done. The Dealership fix is near $10K (If both CAT and some AI codes pop up), which is a long term fix, but is not likely permanent.
The SAI system will kick off DTC (Diagnostic Trouble Codes) P1442, P1445 and or P2441. Which are the AI switch(s) "stuck closed". These switches typically will test okay, but keep kicking off DTC indicating stuck closed. Toyota has TSB on these. My Toyota parts guy gave me, when I asked about P1442 & P1445 These are for Bk1 & BK2 AI switches, which sit on water bypass joint rear. The TSB, recommends replacing all mechanical parts of AI system, wit a notation * Replace ONLY If damaged by debris. Reuse parts when possible.. Which in 2019 was about $3K in parts, just for SAI stuff. Some block off the S.A.L system, which solves the issue. But, Blocking off S.A.I., is not street legal.
What part am I talking about....Drum roll ........ A small foam filter inside the secondary air injection blower fan (S.A.I. pump)
This bit of foam filter material measures about 15mm x 5mm. Which is only remnants of a AI pump filter found remaining in my test engine.
Here is a factory SAI filter, in good condition, exposed under the top of Secondary Air Injection Pump - Toyota (17610-0C010) (Blower) without bracket, list for ~$600 today.
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