Hello all! I bought a 2006 lx470 in October knowing that there was a p2445 code on the vehicle. Knowing it was the SAIS system, I immediately bought the Hewitt Technologies full bypass kit including the block off plates. Vehicle drove fine but then threw a p1613 and I called Hewitt tech and diagnosed. P1613 stopped. Truck then threw a p0420 oxygen sensor code. I drove with that code popping up sporadically for a few months. I could clear and it would not come back on for a few weeks. I was really just testing system to make sure it was truly just that code. Vehicle drove fine during that timeframe.
After a few months, I Had new oxygen sensors, spark plugs, pcv valve, and serpentine belt, installed a couple of weeks ago and vehicle drove great for 5 days with no codes.
Then on startup in afternoon on Monday of this past week after driving in morning, it threw P1440 and p1443 code. They are supposedly for the SAIS switching valve circuit bank 1 and bank 2. Called Hewitt tech back and we diagnosed and pointed to thinking it was their AID module or wire loom. They sent me a new one, installed new AID and wire loom this morning with new soldering at ECM and no code at initial startup but then threw p1443 code after about 5 minutes. Car idled great during first 5 minutes until it threw the p1443 code. Tried to drive short distance and also threw p1613 again randomly one time.
I can not clear codes as they just come back immediately. The only time it doesn’t is if I unplug the Hewitt tech bypass kit plugs from the switching valves on top of passenger side of engine. Then code does not come on.
I plugged back in Hewitt tech kit and went for a drive with the code on. While driving the vehicle idles very rough and is sluggish in the short 2 minute drive I took. Obvious rough running and misfire feeling while driving.
I am at a loss for what it is and need some suggestions. Hewitt tech is closed on the weekend and we have already been without this daily driver for almost a week waiting on the Hewitt tech bypass replacement.
Hoping to get some ideas or feedback on what I can try next before next week. I am obviously considering towing it back to shop that worked on it with new spark plugs, oxygen sensors etc. but it just seems strange it drove great after i got it back from them for 5 days.
Thanks in advance!
After a few months, I Had new oxygen sensors, spark plugs, pcv valve, and serpentine belt, installed a couple of weeks ago and vehicle drove great for 5 days with no codes.
Then on startup in afternoon on Monday of this past week after driving in morning, it threw P1440 and p1443 code. They are supposedly for the SAIS switching valve circuit bank 1 and bank 2. Called Hewitt tech back and we diagnosed and pointed to thinking it was their AID module or wire loom. They sent me a new one, installed new AID and wire loom this morning with new soldering at ECM and no code at initial startup but then threw p1443 code after about 5 minutes. Car idled great during first 5 minutes until it threw the p1443 code. Tried to drive short distance and also threw p1613 again randomly one time.
I can not clear codes as they just come back immediately. The only time it doesn’t is if I unplug the Hewitt tech bypass kit plugs from the switching valves on top of passenger side of engine. Then code does not come on.
I plugged back in Hewitt tech kit and went for a drive with the code on. While driving the vehicle idles very rough and is sluggish in the short 2 minute drive I took. Obvious rough running and misfire feeling while driving.
I am at a loss for what it is and need some suggestions. Hewitt tech is closed on the weekend and we have already been without this daily driver for almost a week waiting on the Hewitt tech bypass replacement.
Hoping to get some ideas or feedback on what I can try next before next week. I am obviously considering towing it back to shop that worked on it with new spark plugs, oxygen sensors etc. but it just seems strange it drove great after i got it back from them for 5 days.
Thanks in advance!