01 Sienna Fuel Pressure >Questions<

[Mule]

I am trying to find the fuel pressure specs for this 01 Sienna. No one locally can give me a good anwser. I called the dealer but got the run around.

I checked the pressure on the front fuel rail(closest to the radiator). I got 48 psi.

The van idles fine but when you put the engine under load it has hesitation and bogging. If you rap the throttle it boggs. I have noticed the exhaust temps are up I suspect its running lean?

I thought possible exhaust obstruction so I pulled the pipes lose at the y and still runs the same.

I have 3 codes.
P0330 Knock Sensor 2 Circut)Bank 2)
P1135 Air-Fuel Sensor heater Circut Response Malfunction
P1155 Air-Fuel Heater Circut malfunction

I thougt to try unhooking knock sensors ( I think those are the 2 at the trans end of engine back of intake) but its ran the same.

Any help would be greatly appreciated.

God Bless

Thomas